Device and method for generation of preamble series in communications system with orthogonal multiplexing and frequency separation of channels

FIELD: engineering of devices for generating series of preamble with low ratio of pike to average power in communications system with orthogonal multiplexing and frequency separation of channels.

SUBSTANCE: in accordance to method, first series of preamble is generated, wherein odd data of input series of preamble are transformed to zero data, and even data of aforementioned series are transformed to nonzero data, first series of preamble is transmitted through one of two antennas, second preamble series is generated, wherein even data of input series of preamble are transformed to zero data, and odd data of aforementioned series are transformed to nonzero data, second series of preamble is transmitted through another antenna.

EFFECT: increased efficiency.

6 cl, 10 dwg

 

The technical FIELD TO WHICH the INVENTION RELATES

The present invention, in General, relates to a communication system with orthogonal multiplexing frequency division multiplexing (OMCR, OFDM) and, in particular, to a device and method of generating a preamble sequence in the communication system OMCR.

The LEVEL of TECHNOLOGY

In General, wireless communication system supporting wireless services, includes Nodes and user devices (PU). Nodes and PU transmitting data frames in a wireless communication system. Consequently, Nodes and PU must implement mutual synchronization for transmission and reception frame transmission, and to implement synchronization, the Node must transmit the synchronization signal so that the transmitter can determine the beginning of a frame transmitted by the Node C. Then PU determines the timing of the frame of the node, taking the synchronization signal transmitted by the Node B, and demodulates received frames according to the defined time frame. In General, for signal synchronization uses a specific sequence of the preamble, the preset Node and PU.

Preferably, the sequence of the preamble in the communication system OMCR uses a preamble sequence having a low ratio of peak-to-average power (OPSM, PAPK). Uh what about takes place due to the fact that in the communication system OMCR high OPSM leads to increased power consumption in the radio frequency (RF) amplifier.

The preamble sequence transmitted from a Node In PU, is generated by successive joins the main sequence S preamble, long preamble sequence required to perform coarse synchronization, with a short sequence P of preamble needed to perform accurate synchronisatie frequency. Only short preamble is used in the preamble transmitted from the PU in the Node, to achieve an accurate synchronization frequency.

Communication system OMCR transmits data to multiple users, or PU, using a time multiplexing in a single frame. In the communication system OMCR the preamble of the frame, indicating the start of frame is transmitted within a predetermined period beginning at the starting point of the frame. Because data may occasionally be transferred to the appropriate users in a single frame, before the beginning of each block of data is a packet preamble, which indicates the beginning of data. Therefore, the PU must accept the data frame to identify the transmission start point of the data. PU must be synchronized with the starting point of the data to receive data, and to this end PU should take the sequence of the preamble, usually used by all systems to synchronize before reception of signals.

The system with the ides OMCR is identical to communication systems other than OMCR type according to the encoding scheme of the source, the channel coding scheme and the modulation scheme. While the communication system, multiple access, code-division multiplexing (mdcr, CDMA) extends the data prior to transmission, the communication system OMCR performs on the data inverse fast Fourier transform (OBPF, IFFT) and then inserts a guard interval in ABPF-transformed data prior to transmission. Therefore, compared with the communication system MCDR, communication system OMCR can transmit the broadband signal using relatively simple hardware. In the communication system OMCR, if a parallel stream of bits/symbols generated by parallel conversion of multiple serial streams of bits/symbol, is considered as ABPF-input frequency domain after modulation performed on the data, ABPP-converted signal time domain is output. The output signal of the time domain obtained by multiplexing broadband signal with multiple narrowband subcarrier signals, the set of modulation symbols is transmitted for the period of one symbol OMCR using process OBPF.

However, in the communication system OMCR if ABPF-converted symbol OMCR is passed, as is, interference between the previous symbol OMCR and the current character OMCR are inevitable. To eliminate mezhsimvolnym guard interval is introduced. Guard interval is used to insert null data within a predetermined time period. However, in the method of passing a null data guard interval, if the receiver had misjudged the starting point of the symbol OMCR, there is interference between subcarriers, causing an increase in error probability of the received symbol OMCR. Therefore, for the guard interval has been proposed scheme "cyclic prefix or a cyclic Postfix". In the scheme of cyclic Postfix last 1/n bits per symbol OMCR time domain are copied and then inserted into an effective symbol OMCR, and in the scheme of cyclic prefix for the first 1/n bits per symbol OMCR time domain are copied and then inserted into an effective symbol OMCR.

The receiver can establish a time/frequency synchronization symbol OMCR using the characteristics of the guard interval created by copying part of one character OMCR time domain, i.e. the initial part or the last part of one character OMCR, and then building the copied characters OMCR with repetition.

In any radio frequency (RF) system, the transmission signals transmitted by the transmitter is distorted when passing them on the air, and, therefore, the receiver receives a distorted signal transmission. The receiver sets the frequency-time synchronization is reatogo distorted signal transmission, using the sequence of the preamble, the predetermined between the transmitter and the receiver performs channel estimation and then demodulates the signal from the estimated channel symbols of a frequency domain by using fast Fourier transform (FFT). After demodulation, the signals from the estimated channel symbols of the frequency domain, the receiver performs channel decoding and decoding of the source, the corresponding channel decoding used in the transmitter, on the demodulated symbols, thereby decoding the demodulated symbols in the information data.

Communication system OMCR uses the sequence of the preamble for timing, personnel, frequency synchronization and channel estimation. Communication system OMCR can perform a temporary frame synchronization, frequency synchronization and channel estimation using a guard interval and pilot subcarriers signal in addition to the preamble. The sequence of the preamble is used to transmit known symbols in the initial part of each frame or the data packet and updates the information in the estimation of the time/frequency channel in terms of data, using information from the guard interval and pilot subcarrier signal.

Fig. 1 is a diagram illustrating the structure of a long sequence preamble to known what istemi communication OMCR. It should be noted that the existing communication system OMCR uses the same preamble sequence as in the downlink (NL, DL)and uplink communication (VL, UL). In Fig. 1 long sequence preamble sequence of length 64, is repeated 4 times, and the sequence of length 128 repeats 2 times. In light of the characteristics of the communication system OMCR mentioned above, a cyclic prefix (CP, CP) is added in front of the 4 repeated sequences of length 64 and the front part 2 repeat sequences 128. In the following description, the sequence consisting of 4 repeating sequences of length 64, denoted as "S", and the sequence consisting of 2 repetitive sequences of length 128, called "P".

Additionally, as described above, the signals obtained before performing OBPF, are signals of a frequency domain, and the signals obtained after performing ABPP, is the signal of time domain. Long sequences of the preamble shown in Fig. 1, represent a long sequence preamble time domain, obtained after performing OBPF.

A long sequence preamble frequency domain obtained before performing OBPF, illustrated below for an example.

Fig. 2 is a diagram illustrating the structure of the short preamble sequence for an existing communication system OMCR. In Fig. 2 in a short sequence of the preamble sequence of length 128 repeats 2 times. In light of the characteristics of the communication system OMCR the above-mentioned cyclic prefix (CP) is added in front of the two repeated sequences of length 128. Additionally, a short sequence of the preamble shown in Fig. 2, is a short sequence of the preamble time domain obtained after performing OBPF, and a short sequence of the preamble frequency domain, similar to P(-100:100). As shown in Fig. 1 and 2, the subsequent portion (part) of a long sequence preamble has the same structure as that of the short is the sequence of the preamble. Further, the later part of a long sequence preamble short preamble sequence used in the same sense.

A long sequence preamble defined above, can be generated, taking into account the following conditions.

(1) a Long sequence preamble should have a low OPSM.

To maximize the transmission efficiency of the power amplifier (PA) in the transmitter of the communication system OMCR OPSM character OMCR should be low. That is because ABPF-converted signal is supplied to a power amplifier having a nonlinear characteristic, a low OPSM. OPSM character OMCR should be low in relation to the maximum power to average power symbol OMCR time domain corresponding to the output terminal of the processor OBPF transmitter, and a low ratio of maximum power to average power must be provided by a uniform distribution. In other words, OPSM output becomes low if the characters that have low cross-correlation, are combined in the input terminal processor OBPF, i.e. in the frequency domain.

(2) a Long sequence preamble shall be suitable for the estimation of the parameters required to initialize communications.

Parameter estimation involves estimation of the channel estimation of the offset is Oia frequency and estimate the time shift.

(3) a Long sequence preamble should have a low complexity and a small amount of proprietary information.

(4) a Long sequence preamble must be available for a rough estimate of the frequency offset.

The function of the long sequence preamble generated by considering the above conditions, described below.

(1) the Sequence obtained by 4-fold repetition of a sequence of length 64, is used to estimate the time shift and a rough estimate of the shift of frequency.

(2) the Sequence obtained by 2-fold repetition of a sequence of length 128, is used for accurate measurement of the shift of frequency.

In the long sequence preamble is used in the communication system OMCR as follows.

(1) the Long preamble sequence is used as the first preamble sequence of a Protocol data unit (PBB, PDU) downlink.

(2) a Long sequence preamble is used for initial ranging.

(3) a Long sequence preamble is used to rank the query bandwidth.

In addition, the short preamble sequence is used in the communication system OMCR as follows.

(1) a Short sequence of the preamble is used as the sequence preamb the crystals data uplink connection.

(2) a Short sequence of the preamble is used for periodic ranging.

In the communication system OMCR because accurate synchronization can be achieved by performing initial ranging and periodic ranging, the sequence of the preamble data uplink communication is mainly used for channel estimation. For channel estimation should take into account OPSM, performance, and complexity. In the case of an existing short sequence of the preamble OPSM is 3,5805 [dB], and uses different algorithms for channel estimation, such as the algorithm minimum mean square error (ISCED) and the least squares algorithm (TC).

Fig. 3 is a diagram showing the mapping relation between subcarriers and a preamble sequence during OBPF in the communication system OMCR. In Fig. 3 it is assumed that the number of all subcarriers for communication systems OMCR is 256, and 256 subcarriers include subcarriers from -128 to 127, and the number of usable subcarriers is 200, and 200 subcarriers include subcarriers -100,...,-1,1,...,100. In Fig. 3 digits on the input terminal processor OBPF represent frequency components, i.e. the unique number of subcarriers. The reason for placing the zero data 0 or data on a 0-th subcarrier is what the 0-I subcarriers after performing OBPF represents the starting point of the sequence of the preamble time domain, ie represents the DC component of the temporary domain.

Zero data appears on 28 subcarriers from the-128th to-101st subcarrier and 27 subcarriers from 101st to 127th sub-carrier, excluding 200 usable subcarriers and the 0-th subcarriers. Hence, the reason for placing the zero data on 28 subcarriers from the-128th to-101st subcarrier and 27 subcarriers from 101st to 127-th subcarrier is the provision of guard interval in the frequency domain, since 28 subcarriers from the-128th to-101st subcarrier and 27 subcarriers from 101st to 127th sub-carrier corresponds to the band of high frequencies in the frequency domain. As a result, if the preamble sequence S(-100:100) or P(-100:100) frequency domain is applied to the processor OBPF, the processor OBPF displays the preamble sequence S(-100:100) or P(-100:100) frequency domain to the corresponding subcarriers converts OBPF shows the sequence of the preamble and produces a sequence of preamble time domain.

Fig. 4 is a block diagram illustrating the structure of a known transmitter of the communication system OMCR, which transmits data using one transmission antenna. If the information bits intended for transmission are generated in a communication system OMCR, information bits are fed into the device 411 of the display characters. Device 411 of the display characters display on imbali input information bits by using the pre-selected modulation scheme, and then provides information bits, displayed on characters in the series-parallel (PS/PR) Converter 413. PS/PR Converter 413 performs a 256-point parallel transform on the symbol received from the device 411 may be displayed, and provides its output signals to the selector 417. As described above, in the "256"-point parallel transform denotes the number of subcarriers. Generator 415 sequence of the preamble under the control of a controller (not shown) generates the appropriate sequence of the preamble and provides the generated preamble sequence to the selector 417. The corresponding sequence of the preamble is S(-100:100) or P(-100:100)described in connection with Fig. 1 and 2. The selector 417 selects the output signal from the PS/PR Converter 413 or the output signal from generator 415 sequence of the preamble according to what is planned at the appropriate time, and provides the selected signal to the processor 419 OBPF.

The selector 417 determines whether the transmitted preamble sequence generated by the generator 415 sequence of the preamble, or symbols generated by the PS/PR Converter 413. If the selector 417 decides to transmit the sequence of the preamble, it transmits a preamble sequence generated by the generator 415 succession is eljnosti preamble. However, if the selector 417 decides to transfer characters, it passes the symbols generated by the PS/PR Converter 413.

The processor 419 OBPF performs a 256-point OBPF on the signal received from the PS/PR Converter 413 or generator 415 sequence of the preamble, and provides its output signals in parallel-serial (PR/PS) Converter 421. In addition to the output signals from the processor 419 OBPF on PR/PS Converter 421 is served cyclic prefix. PR/PS Converter 421 converts the serial output signal processor 419 OBPF and a cyclic prefix, and provides its output signal in a digital to analog (d/a) Converter 423. D/a Converter 423 converts the analog output signal PR/PS Converter 421 and provides the converted analog signal into a radio frequency (RF) processor 425. The RF processor 425 includes a filter that performs RF processing of the output signal d/a Converter 423 so that it can be transmitted over the radio channel, and then transmits the RF signal through the antenna.

The receiver performs the channel estimation using the preamble sequence generated from a short sequence of the preamble. However, the short preamble sequence P(-100:100) is a short sequence of the preamble even put the soup. "A short sequence of the preamble of the even-numbered sub-carrier" means a sequence of the preamble, for which a unique number subcarrier on which data is +1 or -1, not null data inserted among the elements of the short preamble sequence is an even number. Although 0-I carriers (DC component) is an even-numbered subcarrier, it is impossible, since it must of necessity be entered zero data.

One of the main functions of the short preamble sequence P(-100:100) is the estimation of the channel, as described above. However, when performing channel estimation using only a short sequence of the preamble of the even-numbered subcarrier, the channel corresponding to the odd-numbered subcarrier, can not be estimated, because the channel estimation should be performed even-numbered subcarrier. This assessment leads to poor performance. To improve performance by using the channel estimation requires a short sequence of the preamble of the even-numbered subcarrier and a short sequence of the preamble of the odd-numbered subcarrier. However, the existing short preamble sequence P(-100:100) is a short sequence of the preamble of the even-numbered subcarrier and the short preamble sequence of an odd subcarrier does not exist.

Accordingly, the su is basically the need for a short sequence of the preamble odd subcarrier, low OPSM.

The INVENTION

Therefore, the present invention is a device and method to generate a short sequence of the preamble odd subcarrier to perform the correct channel estimation at the receiver antenna.

Another objective of the present invention is to provide a device and method to generate a short sequence of the preamble odd subcarrier having a low OPSM.

Another object of the present invention is to provide a device and method of transmitting a short sequence of the preamble of the odd-numbered subcarrier and a short sequence of the preamble of the even-numbered subcarrier using a single antenna.

Another object of the present invention is to provide a device and method of transmitting a short sequence of the preamble of the odd-numbered subcarrier and a short sequence of the preamble of the even-numbered subcarrier using a set of antennas.

To achieve the above and other problems, the authors propose a device and a method of generating a preamble sequence in the communication system with orthogonal multiplexing frequency division multiplexing (OMCR)having at least one transmitting antenna. The device and method provide a short sequence of the preamble odd padnes is her having a low ratio of the peak-to-average power (OPSM), so that the receiver can accurately estimate a channel using a short preamble sequence of an odd subcarrier. That is, the sequence of the preamble generating, using the supplied short sequence of the preamble of the odd-numbered subcarrier and the sequence of the preamble of the even-numbered subcarrier, and then passed into the receiver. Then, the receiver performs accurate estimate of the channel using a short preamble sequence of an odd subcarrier and a short sequence of the preamble of the even-numbered subcarrier.

BRIEF DESCRIPTION of DRAWINGS

The above and other objectives, features and advantages of the present invention will be more apparent from the following detailed description in conjunction with the accompanying drawings, in which:

Fig. 1 is a diagram illustrating the structure of a long sequence preamble to the known communication system OMCR;

Fig. 2 is a diagram illustrating the structure of the short preamble sequence for a known communication system OMCR;

Fig. 3 is a diagram showing the mapping relation between subcarriers and a preamble sequence during OBPF in the communication system OMCR;

Fig. 4 is a block diagram illustrating the structure transmit the ICA known communication systems OMCR, using one transmission antenna;

Fig. 5 is a block diagram illustrating the structure of a transmitter of a communication system OMCR using two transmitting antennas according to a variant implementation of the present invention;

Fig. 6 illustrates the rule 1 of the transmission of the preamble for transmission of the preamble in the communication system OMCR using a single transmitting antenna and the appropriate procedure to generate a sequence of the preamble according to a variant implementation of the present invention;

Fig. 7 illustrates the rule 2 of the transmission of the preamble for transmission of the preamble in the communication system OMCR using two transmitting antennas and the corresponding procedure of generating a preamble sequence according to a variant implementation of the present invention;

Fig. 8 illustrates a rule 3 of the transmission of the preamble for transmission of the preamble in the communication system OMCR using two transmitting antennas and the corresponding procedure of generating a preamble sequence according to a variant implementation of the present invention;

Fig. 9 is a chart showing the relationship of correspondence between subcarriers and a preamble sequence during OBPF in the communication system OMCR using a single transmitting antenna according to a variant implementation of the present invention;

Fig. 10 is a diagram showing zavisimosti correspondence between subcarriers and a preamble sequence during OBPF in the communication system OMCR, using two transmitting antennas according to another variant implementation of the present invention.

DETAILED DESCRIPTION of PREFERRED embodiments of the PRESENT INVENTION

Below are described several preferred embodiments of the present invention with reference to the accompanying drawings. In the following description, a detailed description of known functions and structures incorporated in the present description is omitted for clarity.

Fig. 5 is a block diagram illustrating the structure of a transmitter of a communication system OMCR using two transmitting antennas. In Fig. 5 if the data bits intended for transmission are generated by the communication system OMCR, information bits are fed to the device 511 of the display characters. The device 511 symbols display displays the input information bits to symbols, and then provides the information bits are mapped to symbols in series-parallel (PS/PR) Converter 513. PS/PR Converter 513 performs 256·2-point parallel transform on an input symbol from the device 511 of the display characters. 256·2-point parallel transform "256" means the number of subcarriers and "2" represents the number of antennas. That is, the device 511 of the display characters generates 256 symbols is s to antenna No. 0 and 256 characters for the antenna No. 1, PS/PR Converter 513 converts the received 512 characters from device 511 may be displayed in parallel characters. In General, the symbols output from the PS/PR Converter 513 are called "symbols OMCR". Characters OMCR output PS/PR Converter 513 served in the space-time encoder 515.

Space-time encoder 515 performs the following procedure. Of 512 parallel symbols generated by the PS/PR Converter 513, senior 256 characters OMCR called S0and the younger 256 characters OMCR called S1. As shown below in table 1, symbols OMCR S0and S1can be combined with symbols OMCR-S1*and S0*and passed for two period characters OMCR.

Table 1
The antenna selector No. 0The antenna selector No. 1
Time 0S0S1
1-S1*S0*

Space-time encoder 515 may apply different methods of spatio-temporal coding, different from the above method of displaying characters.

Generator 517 sequence of the preamble, the antenna is 0 generates a preamble sequence under control of a controller (not shown) and provides the generated preamble sequence to the selector 519. As shown in the embodiment of the present invention, the generator 517 sequence of the preamble antenna No. 0 3 generates the sequence of the preamble. 3 sequence of the preamble include S(-100:100), P(-100:100) and Pg(-100:100). Pg(-100:100) will be described in detail below with reference to Fig. 9 and 10.

Thus, the generator 517 sequence of the preamble antenna No. 0 generates one of the 3 sequences of the preamble according to the control commands from the controller. The selector 519 selects the output signal from the space-time encoder 515 or the output signal from generator 517 sequence of the preamble antenna No. 0 according to what is planned at the appropriate time, and provides its output signals to the processor 521 OBPF. In other words, the selector 519 determines whether the transmitted preamble sequence generated by the generator 517 sequence of the preamble antenna No. 0, or symbols generated by the space-time encoder 515. If the selector 519 decides to transmit the sequence of the preamble, it transmits a preamble sequence generated by the generator 517 sequence of the preamble antenna No. 0. On the contrary, if the selector 519 decides to transfer characters, it passes the symbols generated by the space-time encoder 515.

About essor 521 OBPF performs a 256-point OBPF over signal, received from the space-time encoder 515 or generator 517 sequence of the preamble antenna No. 0, and provides its output signals in parallel-serial (PR/PS) Converter 523. As described above, "256" 256-point transform OBPF is 256 subcarriers. In addition to the output signals from the CPU 521 OBPF on PR/PS Converter 523 served cyclic prefix. PR/PS Converter 523 converts the serial output signal processor 521 OBPF and a cyclic prefix, and provides its output signal in a digital to analog (d/a) Converter 525. D/a Converter 525 converts the analog output signal PR/PS Converter 523 and provides its output signals to the RF processor 527. The RF processor 527 includes a filter that performs RF processing of the output signal d/a Converter 525 so that it can be transmitted over the radio channel, and then transmits the RF signal through the antenna No. 0.

Generator 529 sequence of the preamble antenna No. 1 generates a preamble sequence under the control of the controller and provides the generated preamble sequence to the selector 531. As shown in the embodiment of the present invention, the generator 529 sequence of the preamble antenna No. 1 3 generates the sequence of the preamble. OPA the , 3 sequence of the preamble include S(-100:100), P(-100:100) and Pg(-100:100).

Thus, the generator 529 sequence of the preamble antenna No. 1 generates one of the 3 sequences of the preamble according to the control commands from the controller. The selector 531 selects the output signal from the space-time encoder 515 or the output signal from generator 529 sequence of the preamble antenna No. 1 according to what is planned at the appropriate time, and provides its output signals to the processor 533 OBPF. In other words, the selector 531 determines whether the transmitted preamble sequence generated by the generator 529 sequence of the preamble antenna No. 1, or symbols generated by the space-time encoder 515. If the selector 531 decides to transmit the sequence of the preamble, it transmits a preamble sequence generated by the generator 529 sequence of the preamble antenna No. 1. On the contrary, if the selector 531 decides to transfer characters, it passes the symbols generated by the space-time encoder 515.

The processor 533 OBPF performs a 256-point OBPF on the signal received from the space-time encoder 515 or generator 529 sequence of the preamble antenna No. 1, and provides its output signals in PR/PS transformations the user 535. In addition to the output signals from the processor 533 OBPF on PR/PS Converter 535 served cyclic prefix. PR/PS Converter 535 converts the serial output signal processor 533 OBPF and a cyclic prefix, and provides its output signal to the d/a Converter 537. D/a Converter 537 converts the analog output signal PR/PS Converter 535 and provides its output signals to the RF processor 539. The RF processor 539 includes a filter that performs RF processing of the output signal d/a Converter 537 so that it can be transmitted over the radio channel, and then transmits the RF signal through the antenna No. 1.

Was the procedure or data sequence of the preamble using two transmitting antennas with reference to Fig. 5. However, it is also possible to transmit data or sequence of the preamble using one transmitting antenna. Now, description will be given of the procedure of data, or sequence of the preamble using one transmitting antenna with reference to Fig. 4.

If the information bits intended for transmission are generated in a communication system OMCR, information bits are fed into the device 411 of the display characters. Device 411 display symbols display symbols the input information bits using C the previously selected modulation scheme, and then provides information bits, displayed on characters in the PS/PR Converter 413. PS/PR Converter 413 performs a 256-point parallel transform on the symbol received from the device 411 may be displayed, and provides its output signals to the selector 417. Generator 415 sequence of the preamble under the control of a controller (not shown) generates the appropriate sequence of the preamble and provides the generated preamble sequence to the selector 417.

Generator 415 sequence generates a preamble 3 the sequence of the preamble, and 3 sequences of the preamble include S(-100:100), P(-100:100) and Pg(-100:100). The selector 417 selects the output signal from the PS/PR Converter 413 or the output signal from generator 415 sequence of the preamble according to what is planned at the appropriate time, and provides the selected signal in OBPF processor 419. In other words, the selector 417 determines whether the transmitted preamble sequence generated by the generator 415 sequence of the preamble, or symbols generated by the PS/PR Converter 413. If the selector 417 decides to transmit the sequence of the preamble, it transmits a preamble sequence generated by the generator 415 sequence of the preamble. On the contrary, if the selector 417 takes solved the th transmit symbols, he passes the symbols generated by the PS/PR Converter 413.

The processor 419 OBPF performs a 256-point OBPF on the signal received from the PS/PR Converter 413 or generator 415 sequence of the preamble, and provides its output signals in PR/PS Converter 421. In addition to the output signals from the processor 419 OBPF on PR/PS Converter 421 is served cyclic prefix. PR/PS Converter 421 converts the serial output signal processor 419 OBPF and a cyclic prefix, and provides its output signal to the d/a Converter 423. D/a Converter 423 converts the analog output signal PR/PS Converter 421 and provides the converted analog signal to the RF processor 425. The RF processor 425 includes a filter that performs RF processing of the output signal d/a Converter 423 so that it can be transmitted over the radio channel, and then transmits the RF signal through the antenna.

As described above, although the known sequence generator generates a preamble only 2 of the preamble sequence S(-100:100) and P(-100:100), a new sequence generator of the preamble can generate 3 of the preamble sequence S(-100:100), P(-100:100) and Pg(-100:100). Pg(-100:100) is a short sequence of the preamble odd subcarrier in the frequency domain. In the system of light and OMCR signals, obtained before performing OBPF, are signals of a frequency domain, and the signals obtained after performing ABPP, is the signal of time domain. "Short preamble sequence of an odd sub-carrier" means a sequence of the preamble, for which a unique number subcarrier on which data is +1 or -1, not null data inserted among the elements of the short preamble sequence is an odd number.

Now, with reference to Fig. 9 and 10, description will be given of the sequence of the preamble generated by the sequence generator of the preamble, and the dependence of the correspondence between subcarriers and a preamble sequence during OBPF in the communication system OMCR. The present invention provides a device and method to generate a short sequence of the preamble odd subcarrier having a minimum OPSM in the communication system OMCR, in which the total number of subcarriers is 256, and actually used a unique number of subcarriers are -100,-99,...,-1,1,...,99,100. The preamble sequence is classified into a long sequence preamble and a short sequence of the preamble. In a long sequence preamble sequence of length 64 is repeated 4 times, and the sequence of length 128 is repeated 2 times, and in light of the features is to communication systems OMCR adds a cyclic prefix to the initial part four repeated sequences of length 64 and to the front of the twice-repeated sequences of length 128. In addition, in a short sequence of the preamble sequence of length 128 is repeated 2 times, and in light of the characteristics of the communication system OMCR adds a cyclic prefix to the initial part of the twice-repeated sequences of length 128.

In the preamble sequences S(-100:100), P(-100:100) and Pg(-100:100), generated by the sequence generator of the preamble, S(-100:100) and P(-100:100) are identical to the sequences of the preamble, as described in the prior art, and Pg(-100:100), proposed in the present invention, is given as:

As mentioned above, Fig. 9 is a chart showing the relationship of correspondence between subcarriers and a preamble sequence during OBPF in the communication system OMCR using a single transmitting antenna according to a variant implementation of the present invention. In Fig. 9 it is assumed that the number of all subcarriers for communication systems OMCR is 256, and 256 subcarriers include subcarriers from -128 to 127, and the number of usable subcarriers is 200, and 200 subcarriers include subcarriers -100,...,-1,1,...,100. In Fig. 9 digits on the input terminal processor OBPF represent frequency components, i.e. the unique number of subcarriers. The reason for placing the zero data 0 or data on a 0-th subcarrier Zack is udaetsya is that 0-I subcarriers after performing OBPF represents the starting point of the sequence of the preamble time domain, i.e. represents the DC component of the temporary domain.

Zero data appears on 28 subcarriers from the-128th to-101st subcarrier and 27 subcarriers from 101st to 127th sub-carrier, excluding 200 usable subcarriers and the 0-th subcarriers. Again, the reason for placing the zero data on 28 subcarriers from the-128th to-101st subcarrier and 27 subcarriers from 101st to 127-th subcarrier is the provision of guard interval in the frequency domain, since 28 subcarriers from the-128th to-101st subcarrier and 27 subcarriers from 101st to 127th sub-carrier corresponds to the band of high frequencies in the frequency domain. As a result, if the sequence of the preamble frequency domain S(-100:100), P(-100:100) or Pg(-100:100) is fed to the processor OBPF, the processor OBPF displays the sequence of the preamble frequency domain S(-100:100), P(-100:100) or Pg(-100:100) to the corresponding subcarriers converts OBPF shows the sequence of the preamble and produces a sequence of preamble time domain.

Below is a description of a situation in which use S(-100:100), P(-100:100) and Pg(-100:100).

(1) S(-100:100)

S(-100:100) is inserted into the input terminals of processors OBPF each antenna (antenna No. 0 and antenna No. 1) or the input terminal processor OBPF od the second antenna in the period leading sequence of the preamble in the period of a long sequence preamble.

(2) P(-100:100)

P(-100:100) is a short sequence of the preamble of the even-numbered subcarrier and is entered in the input terminal processor OBPF. "A short sequence of the preamble of the even-numbered sub-carrier" means a sequence of the preamble, for which a unique number subcarrier on which data is +1 or -1, not null data inserted among the elements of the short preamble sequence is an even number.

(3) Pg(-100:100)

Pg(-100:100) is a short sequence of the preamble of the odd-numbered subcarrier and is entered in the input terminal processor OBPF. "Short preamble sequence of an odd sub-carrier" means a sequence of the preamble, for which a unique number subcarrier on which data is +1 or -1, not null data inserted among the elements of the short preamble sequence is an odd number. That is, it is a short preamble sequence of an odd subcarrier proposed in the present invention.

Fig. 10 is a chart showing the relationship of correspondence between subcarriers and a preamble sequence during OBPF in the communication system OMCR using two transmitting antennas according to another variant implementation of the present invention. In Fig. 10 it is assumed that the number is of all subcarriers for communication systems OMCR is 256, with 256 subcarriers include subcarriers from -128 to 127, and the number of usable subcarriers is 200, and 200 subcarriers include subcarriers -100,...,-1,1,...,100. In Fig. 10 digits on the input terminal processor OBPF represent frequency components, i.e. the unique number of subcarriers. Again, the reason for placing the zero data 0 or data on a 0-th subcarrier is that 0-I subcarriers after performing OBPF represents the starting point of the sequence of the preamble time domain, i.e. represents the DC component of the temporary domain.

Zero data appears on 28 subcarriers from the-128th to-101st subcarrier and 27 subcarriers from 101st to 127th sub-carrier, excluding 200 usable subcarriers and the 0-th subcarriers. The reason for placing the zero data on 28 subcarriers from the-128th to-101st subcarrier and 27 subcarriers from 101st to 127-th subcarrier is the provision of guard interval in the frequency domain, since 28 subcarriers from the-128th to-101st subcarrier and 27 subcarriers from 101st to 127th sub-carrier corresponds to the band of high frequencies in the frequency domain. As a result, if the sequence of the preamble frequency domain S(-100:100), P(-100:100) or Pg(-100:100) is fed to the processor OBPF, the processor OBPF displays the sequence of the preamble frequency domain S(-100:100), P(-100:100) or Pg(-100:100) to conform eastwoodiae subcarriers, converts OBPF shows the sequence of the preamble and produces a sequence of preamble time domain. Below is a description of a situation in which use S(-100:100), P(-100:100) and Pg(-100:100).

(1) S(-100:100)

S(-100:100) is inserted into the input terminals of processors OBPF each antenna (antenna No. 0 and antenna No. 1), or to the input terminal processor OBPF one antenna in the period leading sequence of the preamble in the period of a long sequence preamble.

(2) P(-100:100)

P(-100:100) is a short sequence of the preamble of the even-numbered subcarrier and is entered in the input terminal processor OBPF to antenna No. 0 or antenna No. 1. "A short sequence of the preamble of the even-numbered sub-carrier" means a sequence of the preamble, for which a unique number subcarrier on which data is +1 or -1, not null data inserted among the elements of the short preamble sequence is an even number.

(3) Pg(-100:100)

Pg(-100:100) is a short sequence of the preamble of the odd-numbered subcarrier and is entered in the input terminal processor OBPF for antenna # 1 and antenna # 2 of. "Short preamble sequence of an odd sub-carrier" means a sequence of the preamble, for which a unique number subcarrier on which data is +1 or -1, not zero given the s, inserted among the elements of the short preamble sequence is an odd number. That is, it is a short preamble sequence of an odd subcarrier proposed in the present invention.

Therefore, in contrast to the known technology, the present invention provides a device for the generation of the short preamble sequence of an odd subcarrier having a low OPSM in the communication system OMCR using one or two transmit antennas, thereby improving the performance of communication systems OMCR.

In the communication system OMCR using 2 transmit antennas, a short preamble sequence of an odd subcarrier proposed in the present invention, has OPSM 2,7448 dB.

Fig. 6 illustrates the rule 1 of the transmission of the preamble in the communication system OMCR using a single transmitting antenna according to a variant implementation of the present invention. With reference to Fig. 6 provides a detailed description of the regulations 1. the transmission of the preamble according to a variant of the invention the present invention.

At step 611, the transmitter determines whether the transmission period signal period of the sequence of the preamble. The signal transmission is determined and allocated by the selector, as described above. If the period of signal transmission is not the period of the sequence of the preamble, and the period of the data transmission, the transmitter proceeds to step 613. At step 613, the transmitter performs the operation control of the display data in both the input terminal processor OBPF and then terminates the procedure. However, if at step 611, it was determined that the transmission period of a signal is the period of the sequence of the preamble, the transmitter proceeds to step 615. At step 615, the transmitter determines whether the period of the sequence of the preamble period leading sequence of the preamble in the period of a long sequence preamble. If the period of the sequence of the preamble is the period leading sequence of the preamble in the period of the long preamble sequence, the transmitter proceeds to step 617 where the transmitter performs the operation control the display of a leading preamble sequence S(-100:100) in the period of a long sequence preamble to the corresponding subcarriers at the input terminal processor OBPF and then terminates the procedure. The preamble sequence S(-100:100) is generated by the sequence generator of the preamble according to control commands from the controller, as described above.

However, if at step 615, it was determined that the period of the sequence of the preamble is not the period leading sequence of the preamble in the period of a long sequence of preambles is, and is the period of the short preamble sequence (later part of the period in the period of a long sequence preamble), then the transmitter proceeds to step 619.

At step 619, the transmitter displays the short preamble sequence P(-100:100) even-numbered subcarrier to an input terminal of the processor OBPF. A short sequence of the preamble of the even-numbered subcarrier is the same as described above. At step 621, the transmitter displays the short preamble sequence P(-100:100) is odd subcarrier to an input terminal of the processor OBPF after the lapse of one period of the symbol OMCR and then terminates the procedure. A short preamble sequence of an odd subcarrier is the same as described above.

Summing up, in rule 1 of the transmission of the preamble transmitter transmits a short preamble sequence of an odd subcarrier, and a short sequence of the preamble of the even-numbered subcarrier, so that the receiver can perform the channel estimation. That is, conventionally, a short preamble sequence of an odd subcarrier is estimated using only a short sequence of the preamble of the even-numbered subcarrier. However, using the known method, the transmitter is unable to perform accurate estimate of the channel, therefore, using rule 1, the transmission of the preamble according to Nast is ademu the invention, the receiver can easily perform the estimation of the channel.

Fig. 7 illustrates the rule 2 of the transmission of the preamble in the communication system OMCR using two transmitting antennas according to a variant implementation of the present invention. At step 711, the transmitter determines whether the transmission period signal period of the sequence of the preamble. The signal transmission is determined and allocated by the selector, as described above. If the period of signal transmission is not the period of the sequence of the preamble, and the period of data transmission, the transmitter proceeds to step 713. At step 713, the transmitter performs the operation control data is displayed on both of the input terminal processor OBPF and then terminates the procedure.

However, if at step 711, it was determined that the transmission period of a signal is the period of the sequence of the preamble, the transmitter proceeds to step 715. At step 715, the transmitter determines whether the period of the sequence of the preamble period leading sequence of the preamble in the period of a long sequence preamble. If the period of the sequence of the preamble is the period leading sequence of the preamble in the period of the long preamble sequence, the transmitter proceeds to step 717 where the transmitter performs the operation control the display of the leading sequence to preamble is s S(-100:100) in the period of a long sequence preamble to the corresponding subcarriers at the input terminal processor OBPF, and then terminates the procedure. The preamble sequence S(-100:100) is generated by the sequence generator of the preamble according to control commands from the controller, as described above.

If at step 715, it was determined that the period of the sequence of the preamble is not the period leading sequence of the preamble in the period of the long preamble sequence, and is the period of the short preamble sequence (later part of the period in the period of a long sequence preamble), then the transmitter proceeds to step 719. At step 719, the transmitter displays the short preamble sequence P(-100:100) even-numbered subcarrier to an input terminal of the processor OBPF to antenna No. 0, display short preamble sequence Pg(-100:100) is odd subcarrier to an input terminal of the processor OBPF to antenna No. 1, and then terminates the procedure. "A short sequence of the preamble of the even-numbered sub-carrier" means a sequence of the preamble, for which a unique number subcarrier on which data is +1 or -1, not null data inserted among the elements of the short preamble sequence is an even number. Although 0-I sub component (DC) is an even-numbered subcarrier, it is excluded, as it should be with the need to put n the left data.

Additionally, the "short preamble sequence of an odd sub-carrier" means a sequence of the preamble, for which a unique number subcarrier on which data is +1 or -1, not null data inserted among the elements of the short preamble sequence is an odd number. In Fig. 7 short sequence of the preamble of the even-numbered subcarrier transmitted by the antenna No. 0, and the short preamble sequence of an odd subcarrier transmitted by the antenna No. 1. Then, the receiver performs accurate estimate of the channel, taking a short sequence of the preamble of the even-numbered subcarrier and a short sequence of the preamble of the odd-numbered subcarrier.

Fig. 8 illustrates a rule 3 of the transmission of the preamble in the communication system OMCR using two transmitting antennas according to a variant implementation of the present invention. At step 811, the transmitter determines whether the transmission period signal period of the sequence of the preamble. The signal transmission is determined and allocated by the selector, as described above. If the period of signal transmission is not the period of the sequence of the preamble, and the period of data transmission, the transmitter proceeds to step 813. At step 813, the transmitter performs the operation control data is displayed on both of the input terminal processor OBPF, and then terminates the procedure.

If at step 811, it was determined that the transmission period of a signal is the period of the sequence of the preamble, the transmitter proceeds to step 815. At step 815, the transmitter determines whether the period of the sequence of the preamble period leading sequence of the preamble in the period of a long sequence preamble. If the period of the sequence of the preamble is the period leading sequence of the preamble in the period of the long preamble sequence, the transmitter proceeds to step 817.

At step 817, the transmitter performs the operation control the display of a leading preamble sequence S(-100:100) in the period of a long sequence preamble to the corresponding subcarriers at the input terminal processor OBPF, and then terminates the procedure. The preamble sequence S(-100:100) is generated by the sequence generator of the preamble according to control commands from the controller, as described above.

If at step 815, it was determined that the period of the sequence of the preamble is not the period leading sequence of the preamble in the period of the long preamble sequence, and is the period of the short preamble sequence (later part of the period in the period of a long sequence preamble), then the transmitter proceeds to step 819, the de transmitter display short preamble sequence P(-100:100) even-numbered subcarrier to an input terminal of the processor OBPF to antenna No. 0, display short preamble sequence Pg(-100:100) is odd subcarrier to an input terminal of the processor OBPF to antenna No. 1, and then proceeds to step 821.

At step 821, the transmitter displays the short preamble sequence Pg(-100:100) is odd subcarrier to an input terminal of the processor OBPF to antenna No. 0, display short preamble sequence P(-100:100) even-numbered subcarrier to an input terminal of the processor OBPF to antenna No. 1 after the expiry of the period of one symbol OMCR and then terminates the procedure.

In Fig. 8 short sequence of the preamble of the even-numbered subcarrier and a short preamble sequence of an odd sub-carrier in turn is transmitted through the antenna No. 0 and antenna No. 1. Then, the receiver performs accurate estimate of the channel, taking a short sequence of the preamble of the even-numbered subcarrier and a short sequence of the preamble of the odd-numbered subcarrier.

As can be understood from the above description, the present invention provides a short preamble sequence of an odd subcarrier having a low OPSM in the communication system of OMCS, thereby improving the characteristic sequence of the preamble. Additionally, the present invention transmits a short preamble sequence of an odd subcarrier and a short sequence of the preamble of the even-numbered subcarrier, COI is lsua one transmitting antenna and two transmitting antennas so, the receiver can perform the correct estimate of the channel.

Although the present invention has been shown and described with references to certain preferred implementation, specialists in the art it will be clear that it can be made various changes in form and detail without departure from the essence and scope of the present invention defined by the attached claims.

1. The method of generating a preamble sequence having a low ratio of the peak to average power (OPSM), through two antennas in the communication system with orthogonal multiplexing frequency division multiplexing (OMCR), which includes the processor inverse fast Fourier transform (OBPF) for ABPF-convert a set of subcarriers for the input sequence of the preamble from the frequency domain into the corresponding sequence of the preamble in the time domain, namely, that receive the first sequence of the preamble, in which the odd-numbered data of the input sequence of the preamble is converted into null data, and even data input sequence of the preamble convert to a non-zero data, transmit the first the sequence of the preamble through one of the two antennas and receive the second sequence of the preamble, in which the even-numbered data input last is the sequences of the preamble is converted into zero data, and odd data input sequence of the preamble convert to a non-zero data, transmit the second preamble sequence through the other of the two antennas.

2. The method according to claim 1, characterized in that the second sequence of the preamble is defined as Pg(-100:100), where

3. The method according to claim 1, wherein the first preamble sequence is defined as P(-100:100), where

4. The method of generating a preamble sequence having a low ratio of the peak to average power (OPSM), in the communication system with orthogonal multiplexing frequency division multiplexing (OMCR), which includes the processor inverse fast Fourier transform (OBPF) for ABPF-convert a set of subcarriers for the input sequence of the preamble from the frequency domain into the corresponding sequence of the preamble in the time domain, namely, that receive the first sequence of the preamble, in which the odd-numbered data of the input sequence of the preamble is converted into null data, and even data input sequence of the preamble convert to a non-null data for a single period character OMCR, and receive the second sequence of the preamble, in which the even-numbered data of the input sequence PR is amboli is converted into zero data, and odd data input sequence of the preamble convert to a non-zero data for the next period character OMCR after the lapse of one period to symbol OMCR.

5. The method according to claim 4, characterized in that the second sequence of the preamble is defined as Pg(-100:100), where

6. The method according to claim 4, characterized in that the first preamble sequence is defined as P(-100:100), where

7. The method of generating a preamble sequence having a low ratio of the peak to average power (OPSM), through two antennas in the communication system with orthogonal multiplexing frequency division multiplexing (OMCR), which includes the processor inverse fast Fourier transform (OBPF) for ABPF-convert a set of subcarriers for the input sequence of the preamble from the frequency domain into the corresponding sequence of the preamble in the time domain, namely, that receive the first sequence of the preamble, in which the odd-numbered data of the input sequence of the preamble is converted into null data, and even data input sequence of the preamble convert to a non-zero data, transmit the first the sequence of the preamble through the first of the two antennas for a single period character OMCR and the floor is with the second sequence of the preamble, in which the even-numbered data of the input sequence of the preamble is converted into null data and odd data input sequence of the preamble convert to a non-zero data, transmit the second preamble sequence through the second of the two antennas for a single period character OMCR and receive the first sequence of the preamble, in which the odd-numbered data of the input sequence of the preamble is converted into null data, and even data input sequence of the preamble convert to a non-zero data, transmit the first preamble sequence through the second of the two antennas for the next period character OMCR after the lapse of one period of the symbol OMCR and receive the second sequence of the preamble, in which the even-numbered data of the input sequence of the preamble convert in the zero data and the odd data input sequence of the preamble convert to a non-zero data, transmit the second preamble sequence through the first of the two antennas for the next period character OMCR.

8. The method according to claim 7, characterized in that the second sequence of the preamble is defined as Pg(-100:100), where

9. The method according to claim 7, characterized in that the first preamble sequence is defined as P(-100:100), where:

10. At trojstvo for generating a preamble sequence having a low ratio of the peak to average power (OPSM) through two antennas in the communication system with orthogonal multiplexing frequency division multiplexing (OMCR), includes CPU inverse fast Fourier transform (OBPF) for ABPF-convert a set of subcarriers for the input sequence of the preamble from the frequency domain into the corresponding sequence of the preamble in the time domain, containing the sequence generator of the preamble of the first antenna to generate a first sequence of the preamble, in which the odd-numbered data of the input sequence of the preamble is converted into null data, and even data input sequence of the preamble is converted into a non-zero data, and the first preamble sequence is transmitted through one of the two antennas, and the sequence generator of the preamble of the second antenna to generate a second sequence of the preamble, in which the even-numbered data of the input sequence of the preamble is converted into zero data and odd data input sequence of the preamble is converted into a non-zero data, and the second preamble sequence is transmitted through the other of the two antennas.

11. The device according to claim 10, characterized in that the second sequence of the preamble is defined as Pg(-100:100), where:

12. The device according to claim 10, wherein the first preamble sequence is defined as P(-100:100), where

13. Device for generating a preamble sequence having a low ratio of the peak to average power (OPSM), in the communication system with orthogonal multiplexing frequency division multiplexing (OMCR), which includes the processor inverse fast Fourier transform (OBPF) for ABPF-convert a set of subcarriers for the input sequence of the preamble from the frequency domain to the corresponding sequence of the preamble in the time domain, containing the sequence generator of the preamble to generate a first sequence of the preamble, in which the odd-numbered data of the input sequence of the preamble is converted into null data, and even data input sequence of the preamble convert to a non-null data for a single period character OMCR and to generate a second sequence of the preamble, in which the even-numbered data of the input sequence of the preamble is converted into null data and odd data input sequence of the preamble convert to a non-zero data for the next period character OMCR after the lapse of one period to symbol OMCR.

14. The device according to item 13, wherein the second sequence of the preamble is defined as Pg(-100:100), where

15. The device according to item 13, characterized in that the first sequence of the preamble is defined as P(-100:100), where

16. Device for generating a preamble sequence having a low ratio of the peak to average power (OPSM) through two antennas in the communication system with orthogonal multiplexing frequency division multiplexing (OMCR), which includes the processor inverse fast Fourier transform (OBPF) for ABPF-convert a set of subcarriers for the input sequence of the preamble from the frequency domain into the corresponding sequence of the preamble in the time domain, containing the sequence generator of the preamble of the first antenna to generate a first sequence of the preamble, in which the odd-numbered data of the input sequence of the preamble is converted into null data, and even data input sequence of the preamble convert to a non-zero data, and the first preamble sequence is transmitted through the first of the two antennas for a single period character OMCR and through the second of the two antennas for the next period character OMCR after the lapse of one period of the symbol OMCR, and the sequence generator of the preamble of the second antenna to generate a second sequence of the preamble, in which the even-numbered data of the input sequence of the preamble is converted into null data and odd data input sequence of Priam the uly is converted into a non-zero data, and the second preamble sequence is transmitted through the second of the two antennas for a single period character OMCR and through the first of the two antennas for the next period character OMCR.

17. The device according to item 16, wherein the second sequence of the preamble is defined as Pg(-100:100), where

18. The device according to item 16, wherein the first preamble sequence is defined as P(-100:100), where



 

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