The device transmit and receive digital data using a broadband noise-like signals in code division multiplexing

 

The invention relates to broadband communication systems based on spread spectrum via a direct pseudo-random sequence and can be used, in particular, in satellite communication systems or terrestrial communication systems with multiple access based on code division of channels. The device contains a transmitter, which includes a generator chip frequency generator of pseudorandom sequences (SRP), the generator carrier frequency, the phase shifter 90oand the in-phase and quadrature channels, each of which consists of an encoder, the first and second modulators, series-parallel Converter and switch, as well as summing amplifier and antenna, and a receiver which includes an antenna, an amplifier, a coherent detector, the power recovery of the carrier frequency and phase, the search block and the synchronization delay, the generator of the SRP, as well as in-phase and quadrature channels, each of which consists of a block channel demodulators unit selection maximum series-parallel Converter, a casting block on the switch and decoder. The technical result achieved by the invention is in providing highly>/p>The invention relates to broadband communication systems that use noise-like signals based on the spread spectrum via a direct pseudo-random sequence. It may be a satellite communication system or a ground-based system of fixed communication with multiple access based on code division channels (mdcr).

The known system described in J. K. Holmes. Coherent Spread Spectrum System. Krieger Publishing company. Malabar. Florida.- 1990, p. 624, using a broadband noise-like signals containing the transmitter and receiver. In the transmitter the input information signal with a speedserved on the encoder. This encoder encodes the input data bits in the code combination for transmission. This can be a block convolutional encoder or encoder as described, for example, in the book.Clark, J. Kane "Coding with error correction in digital communication systems." - M.: Radio and communication, 1987, page 391

Modulator pseudorandom sequence modulates and deploys on the spectrum of the encoded signal from the encoder using a pseudo-random sequence (SRP), coming from the generator of the SRP. The generator carrier frequency generates a signal, which is modulated deploy m and is radiated by the antenna.

In the receiver the transmitted signal is received by the antenna and amplified in the amplifier. The recovery block of the carrier frequency and phase restores according to the reference signal coherent signal. With his help, the coherent detector detects the received signal and generates proyektirovanii signal to the demodulator of the SRP and the search block and synchronization delay. The search block and the synchronization delay has an internal generator of the SRP, which generates a copy of the SRP used in the generator of the SRP. The search block and the sync delay synchronizes between predetection signal with a copy of the SRP with the local oscillator of the SRP. These devices are described in many books, for example, A. I. Alekseev, A., Sheremetiev, G. I. Tuzov, B. I. Glazov "Theory and application of pseudorandom signals, Izd-vo Nauka, M., 1969, Fig. 6.7, 6.8, 6.12, or "Noise-like signals in communication systems", Ed. by Pestryakova Century B. M., Owls. Radio, 1973, Fig.5.5.1, Fig.5.6.2.

After the establishment of the synchronism unit search and synchronization latency issues fazirovannoi a copy of the SRP to the demodulator of the SRP. The demodulator SRP demodulates (roll on the spectrum) proyektirovanii signal and outputs the encoded signal to a casting block and d is or channel decodes the bits in the data bits, issued to the exit.

Closest to the technical essence and the achieved effect is a transmission system with expansion of the range described in U.S. patent 5414728, N 04 To 1/00 from may 9, 1995, "Methods and apparatus for bifurcating signal transmission over in-phase and a quadrature phase spread spectrum communication channels".

The known system includes (see Fig.1) on the transmission of two information flow from users of the 1st channel, 2nd channel, which is transmitted with the speedeach in-phase I and quadrature Q channels, respectively, or a single high speed data stream with velocityfrom the user common channel, which first demultiplexed in the demultiplexer 1 to two streameach and then transmitted over the in-phase I and quadrature Q channels from individual users of the 1st and 2nd channels. Two information flow coming next on the encoder1I channel and encoder 22Q channel. The signal of each channel is deployed on the spectrum of their individual SRP: phase I channel using SRP1generated by the generator 31; quadrature Q channel using SRP2generated by the generator 33. In the modulators 4 SRP1and 4atory carrier frequencies 51and 52I channel and Q channel, respectively.

Common-mode signal generated by the generator carrier frequency 6 I channel modulated by the phase modulator carrier frequency 51I channel using the resulting signal from the modulator 4 SRP1and fed to the summing amplifier 8. Quadrature signal obtained from the oscillator carrier frequency 6 of channel I with a subsequent shift in phase by 900in the phase shifter 7, is modulated by the phase modulator carrier frequency 52Q channel using the resulting signal from the modulator 4 SRP2and fed to the summing amplifier 8.

After summation of the I and Q signals in a summing amplifier 8 the resulting signal is fed into the antenna 9 for transmission. In the receiver (see Fig.2) the signal is received by the antenna 10, is amplified in amplifier 11 and then processed I and Q channels. The recovery block of the carrier frequency and phase 12 restores the demodulated in-phase I and quadrature Q bearing and submit them separately to the coherent detector 13. In the coherent detector 13 separately detected inphase I and quadrature Q components of the received resulting signal and proyektirovaniye I and Q signals are issued in two separate outputs for dapaddentry of synchronism for the delay. After entering the synchronism unit search and synchronization delay 14 phase generators SRP115 and SRP216 so that the phase of the generated copies of the SRP with generators 15 and 16 coincide with the phases of the SRP received signals.

In the demodulator SRP 17 there are two separate demodulator for phase I and quadrature Q signals, which are served separately copies of the SRP with generators 15 and 16, respectively. In the demodulation (convolution of signals on the spectrum) from the output of the demodulator receives proyektirovaniye signals without the extension of the spectrum, which are further processed in the decoder 18 and the multiplexer 19. In considering the nearest similar to each subscriber station are two orthogonal pseudo-random sequences (SRP).

One of the SRP is used for the direct spread spectrum in-phase channel, the other of the SRP is used to direct expansion of the spectrum in the quadrature channel. Then both components of the signal - phase and quadrature - are added in summing amplifier and emitted by the transmitter on the same carrier frequency in the direction of the receiver (the receiver Central station). With this method of transmission of the transmitted signal is obtained permanent arowana mode.

The disadvantages described in the patent 5414728 system are the low spectral efficiencyand the limited speed of information transmission.

If the transmission rate information for each (inphase and quadrature) data channel, the maximum permissible input speed of the transmission of the subscriber station is equal to 2B. If you need to pass in two, three, five times faster requires the inclusion of two, three, five subscriber stations or complicated in two, three, five times modulator with peak factor much greater than one. In both cases, these solutions are not cheap, and in the second case and not optimal due to the poor use of transmitter power (peak factor of the envelope much more than one).

The spectral efficiency of the system is equal towhere 2V - input transmission rate of the subscriber station;F - occupied bandwidth; M - the number of subscriber stations operating in the same frequency band at the same time by the method of multiple access code division multiplexing (mdcr).

In direct expansion base n SRP approximately equal toF. At each subscriber station should select SRP.

Therefore, the number of simultaneously operating stations of M isconsidering the fact that the total number of orthogonal SRP is the basis of the n signals.

Substituting (3) into (1) finally get the
Thus, the spectral efficiencythe closest analogue is not maximum (=1<2) and the input data rate is limited to the value
.

The present invention is the creation of a system for the transmission of discrete data with higher spectral efficiency (>1) and (or) higher transmission rate of each user station with access 2B+D= 144 KB/s ISDN, video conferencing with a speed of 384 KB/s, velocities, 512, and 1024 KB/s for access to the Internet, as well as variations in a wide range of input velocity of the subscriber station from the speed ADPCM 32 kbit/s and PCM 64 to the maximum 1024 KB/s or E1=2048 KB/s
To achieve this technical result is offered to each subscriber station implementation where
N=2k, k,1 (5)
The problem is solved so that the device is sending and receiving digital data using a broadband noise-like signals in a code division of channels containing the transmitter in-phase and quadrature channels, are made identical, and each of which includes an encoder, the input of which is the input information signal, and serially connected first and second modulators, as well as the pseudo-random sequence generator (SRP) and the generator carrier frequency, the output of which is connected to another input of the second modulator in-phase channel and through the phase shifter with a different input of the second modulator quadrature channel, and the second outputs of the modulators in-phase and quadrature channels through summing amplifier connected to the antenna, and the receiver is connected in series with the antenna, an amplifier and a coherent detector and the in-phase and quadrature channels, each of which are crucial unit and the demodulator, and the outputs of the coherent detector is connected respectively to one of inputs of the demodulators in-phase and quadrature channels, and the generator of the SRP, the transmitter dovalina-parallel Converter and a switch, moreover, the in-phase and quadrature channels of the output of the encoder connected to the input of a series-parallel Converter, "k", the outputs of which are connected to respective control inputs of the switch, the output of which (k+1) output of serial-to-parallel Converter connected to the corresponding inputs of the first modulator, a "N" outputs of the generator SRP connected to respective inputs of the switches in-phase and quadrature channels, and the generator output of the chip frequency is connected with a clock generator input SRP, control outputs which are connected to the corresponding reading input serial-to-parallel converters in-phase and quadrature channels, and in the receiver put the power recovery of the carrier frequency and the search block and the synchronization delay, and the in-phase and quadrature channels are introduced, respectively, the block select maximum and switch connected in series, in parallel-to-serial Converter and the decoder and demodulator phase and quadrature channels made in the form of N-channel demodulators, with N outputs of the generator SRP connected to the corresponding inputs of the N-channel demodulators-phase kVA and who am casting block and the block select maximum, "k" outputs of which are connected to corresponding inputs of a parallel-serial Converter and to the control inputs of the switch, to the input of which is connected to the corresponding outputs of the decision making unit, the outputs of block recovery of the carrier frequency connected to the corresponding inputs of the coherent detector, the input and the control input of the power recovery of the carrier frequency are connected respectively with the output of the amplifier and one of the control output generator SRP, other control outputs and a control input of which is connected with the corresponding inputs and output of the search block and the synchronization delay, the outputs of which are connected respectively to the control inputs parallel-to-serial converters in-phase and quadrature channels, to the control inputs of the decision making unit and the unit of choice high in-phase channel and to the control inputs of the decision making unit and the block select maximum quadrature channel.

The invention is illustrated in Fig.3 and 4, which shows the proposed device for transmitting and receiving digital data.

In Fig.3 presents the structural functional block diagram of the transmitter, and Fig.4 is a functional block diagram of the receiver.

The receiver (Fig.4) includes an antenna 17, the amplifier 18, the coherent detector 19, in-phase and quadrature channels, composed of N-channel demodulators 20 and 21, the crucial blocks 22 and 23, the switches 24 and 25, a parallel-serial converters 26 and 27, block selection maximum 28 and 29, the carrier recovery block (NR) 30, block search, and sync delay 31, decoders 33 and 34. The device transmit and receive digital data works as follows.

In the transmitter (Fig.3) data can be transferred to the inputs of the encoders 1 and 2 from two independent sources or from one high-speed source through the demultiplexer, the output of which is the speed of information flow is reduced in 2 times. After coding the encoders 1 and 2 this information is then fed to serial-to-parallel converters 4 and 5, rasparallelivanija to (k+1) outputs, resulting in a speed of 5 arrive at the control inputs of the switches 8 and 9. Depending on type "k" binary information symbols on the control inputs of the switches 8 and 9 on the outputs of these switches selects one of the N=2kThe SRP from the generator SRP 10. The outputs of the (k+1) series-parallel converters 4 and 5 is fed to one input of the first modulator 6 and 7, in which it undergoes a pseudo-random modulation using one of the selected switches 8 or 9 of the SRP. From outputs of first modulators 6 and 7 binary SRP in direct or inverted form are received at the first inputs of the second modulators 11 and 12 in-phase and quadrature channels, the second input of which receives the signal from the output of the LF generator directly and through the phase shifter 90. With outputs of the second modulator signals via summing amplifier 15 are radiated by the antenna 16.

Generator HH 3 controls the generator SRP 10, control outputs of which are connected with the probe inputs serial-to-parallel converters 4 and 5, which ensures synchronization through which the beginning and end of each selected SRP coincides with the beginning and end of each bit of information.

Due to the lower speed converters 4 and 5 can transmit high speed recording motion the measures 5 MHz to stream with a speed of 1 Mbit/s with a base of n=32 and not 5 as the nearest equivalent.

Changing the number of SRP at this station you can change the baud rate without changing the base n, chip frequency, occupied bandwidth, which allows you to do multi-speed modems without changing the settings of the radio transmitter and receiver. Due to the use of every moment of transfer of only one or two of the SRP on the quadrature components of the total signal in the summing amplifier 15 is always a constant level (the peak factor for the envelope is equal to 1), which simplifies and reduces the cost of the transmitter and receiver and allows you to use the power of the transmitter. The same property of the output signals minimizes mutual interference between stations in an orthogonal multiple access, code-division multiplexing.

In the receiver (Fig.4) the signal from the antenna 17 after amplification in the amplifier 18 is fed to the coherent detector 19 and the power recovery of the carrier frequency and phase 30. After separation of the coherent carrier and coherent detection phase and quadrature components of the signals of these components act on the N-channel demodulators 20 and 21 in-phase and quadrature channels and editor 32 and the work of critical blocks 22 and 23, units select max 28, 29, and parallel-serial converters 26 and 27. N-channel demodulators 20 and 21 have an individual demodulators SRP in the number N=2kfor each of the possible used of the SRP. Therefore, in one individual demodulators SRP will be a convolution of the signal spectrum, and all the other (2k-1) the individual demodulators SRP convolution will not. Units select max 28 and 29 is determined by the maximum energy of the individual demodulator SRP, which occurred convolution, and generates k bits of information in parallel-serial converters 26 and 27 for converting the serial code and k bits of information on the switches 24 and 25 for the issuance of the decision with the decisive blocks 22 and 23, which correspond to the individual demodulators SRP, which occurred convolution. One bit of information from the output of the switches 24 and 25 and k-bit output block selection maximum 28 and 29 is converted into the parallel-serial converters 26 and 27 of the serial code with the increase in the speed data in the (k+1) times and issued to the decoders 33 and 34 and then two recipients separately or after multiplexing in the multiplexer to a single recipient with Povarov information convolution will be performed in one of the subchannels N-channel demodulator. Further folded signal is applied to the casting unit, which is integrated in integrators for the duration of one bit and the result of integration is served with each of the N integrators, respectively, at the N computing devices of its subchannel.

Solver of its subchannel determines the sign of the transmitted bits ("+" or "-", i.e., 0 or 1). Simultaneously folded signal N-channel demodulator is fed to the block select maximum, which also contains N integrators for the duration of one bit. The block select max determines the maximum of the voltages at the outputs of the N integrators and thereby determines which of the N SRP was used for this particular set of k information bits. On the one hand, the block select max through the switch opens the way to the exit that crucial device N-channel deciding unit, the subchannel which the greatest result of the convolution and integration. On the other hand, this same block issues and the decision about the set of k information bits, which made the selection of one of the SRP of N on the transmission. Then k information bits from the output of the block select maximum and one bit from the output of the switch is converted to a parallel-serial Converter BCO speed In b/s or optionally multiplexed in the multiplexer in the flow with velocity 2V b/s

In the proposed method, the base (length) n SRP is defined as

The maximum number of stations M with a predetermined number N =2kThe SRP for each station is

Spectral efficiencythe whole system of M stations equal

We will call partial speed B1

In the proposed method, the velocity at the inlet station is

In table.1 given the values ofand 2B depending on k, for xed B1.

The analysis of table. 1 shows that the highest spectral efficiency is achieved when k= 1, i.e., in the present invention. However, the input speed of the station it is limited to the value 4B1.

In the present invention, the input speed is higher than in the nearest analogue and increases with increasing k up to k=3 without loss. Therefore, the proposed transmission device and the reception has the advantage that it is very well adapted to group users and service ISDN services. Let us illustrate this by examples.

In table. 2 forF. When this was taken fch=4096 kHz.

The parameters of the nearest analogue is presented in the same table.2 when k=0.

The analysis of table.2 allows us to conclude that access ISDN 264+16=144 KB/s better done with a base of n=128 and k=2(2B=192 KB/s), and videoconferencing (2B=384 KB/s) with a base of n=64 and k=2 in both cases with a relatively high spectral efficiency=1,5 greater than the nearest equivalent. The closest analogue worse of the present invention at an acceptable speed 2B, and often (when k=1 and 2) worse and spectral density.

Similarly table.2 built table.3 forF=10 MHz fch=8192 kHz and four values base n=32, 64, 128, 256.

The parameters of the nearest analogue is presented in table. 3 when k=0. The analysis of table. 3 allows us to conclude that access E1=2048 KB/s can be carried out four stations with n=32 and=1 and E1/2=1024KB/s - 8 stations with n=64 and=1. The closest analogue loses to the invention, always on speed, and if k=1 and 2, and spectral efficiency at the same time.

Thus, the proposed transmission device and the reception has the highest spectral E. the formation and adapted to users of ISDN Internet speeds 192 kbps, 384 kbps, 512 kbps, 1024 KB/s, 2048 kbit/S. in Addition, since all the speed in the table. 2 and 3 speed 64 KB/s, inlet velocity stations can be considered as composed of velocities m subscribers each with a speed of 64 KB/s Then the proposed transmission device and the reception provides a multicast service m subscribers.

It must be emphasized that the output signal of the transmitter in the proposed device is always at any speed is the peak factor for the envelope equal to the unit that simplifies and reduces the cost of the transmitter.

In the system of simultaneous work of several stations with different communication rates. Namely, one group of stations can operate, for example, in a video conferencing mode with speeds of 384 KB/s, another group of stations in the Internet with a speed of 512 KB/s, and the rest in mode ISDN speeds 192 KB/s Then possible system configuration options are presented in table. 4. In it the values of N are determined by the relations (5), M is chosen smaller than in (7), and the total resource for all stations equal
NM = n (11)
The big advantage of the proposed device is that stations operating at different speeds, impact Tannoy chip frequency. Another great advantage of the proposed device is capable of adjustment stations queries at different speeds through a centralized distribution share SRP between subscribers.

Thanks to the conference call, Internet access can be used by all subscribers, because this service is rare and expensive. The main resource of the SRP will be used for lower-speed services such as ISDN (144-192 KB/s) or IDN (64 kbps).

The invention can be implemented on the respective element based on standard technologies.

The use of the invention allow for the provision of all types of broadband services, from ADIM 32 KB/s PCM 64 kbit/s, 2B+D=144-192 KB/s, conferencing 384 KB/s, link with Internet 512, 1024, 2048 KB/s at a constant basis SRP, permanent chip frequency, constant bandwidth of signals used without changing the settings of the transmitter and receiver with a substantial simplification of requirements in view of the peak factor for the envelope, equal to one, which, in turn, simplifies and reduces the cost of the transmitter and receiver.


Claims

The transmission device and reception of discrete data with ispolzovat and quadrature channels, made identical, and each of which includes an encoder, the input of which is the input information signal, and serially connected first and second modulators, as well as the pseudo-random sequence generator (SRP) and the generator carrier frequency, the output of which is connected to another input of the second modulator in-phase channel and through the phase shifter with a different input of the second quadrature modulator channel and the second outputs of the modulators in-phase and quadrature channels through summing amplifier connected to the antenna, and the receiver is connected in series with the antenna, an amplifier and a coherent detector and the in-phase and quadrature channels, the composition of each of which are crucial unit and the demodulator, and the outputs of the coherent detector is connected respectively to one of inputs of the demodulators in-phase and quadrature channels, and the generator PS, characterized in that the transmitter is entered generator chip frequency, a part of the in-phase and quadrature channels are introduced respectively series-parallel Converter and a switch, with in-phase and quadrature channels of the output of the encoder connected to the input of a series-parallel progo and (k+1) output of serial-to-parallel Converter connected to the corresponding inputs of the first modulator, N outputs of the generator SRP connected to respective inputs of the switches in-phase and quadrature channels, and the generator output of the chip frequency is connected with a clock generator input SRP, control outputs which are connected to the corresponding reading input serial-to-parallel converters in-phase and quadrature channels, and the receiver put the power recovery of the carrier frequency and the search block and the synchronization delay, and the in-phase and quadrature channels are introduced, respectively, the block select maximum and switch connected in series, in parallel-to-serial Converter and the decoder and demodulator phase and quadrature channels made in the form of N-channel demodulators in this case N outputs of the generator SRP connected to the corresponding inputs of the N-channel demodulators in-phase and quadrature channels, each of which has N outputs of the N-channel demodulator connected to the corresponding inputs of the decision making unit and the block select max, k outputs of which are connected to corresponding inputs of a parallel-serial Converter and to the control inputs of the switch to the corresponding input of which is connected you who entogo detector, input and control input block recovery of the carrier frequency are connected respectively with the output of the amplifier and one of the control output generator SRP, other control outputs and a control input of which is connected with the corresponding inputs and output of the search block and the synchronization delay, the outputs of which are connected respectively to the control inputs parallel-to-serial converters in-phase and quadrature channels, the control inputs of the decision making unit and the unit of choice high in-phase channel and the control inputs of the decision making unit and the block select maximum quadrature channel.

 

Same patents:

The invention relates to electrical engineering and can be used in the communication system of channels (mdcr), in particular for the allocation of orthogonal codes in channels with variable data rate, and channel expansion according to the distribution

The invention relates to the field of radio and can be used in the mobile communication system mdcr for the formation of complex quasiorthogonal codes and to expand channel data using a set of complex codes quasiorthogonal

The invention relates to the field of radio and can be used in communication systems MDCRC, simultaneously using orthogonal codes quasiorthogonal

The invention relates to data transmission for communication systems, multiple access, code-division multiplexing (mdcr), in particular to a device and method of manufacture and distribution of characters, preventing deterioration of characteristics of the channel during data transmission

The invention relates to a receiving device and method for communication systems

The invention relates to a device and method of coding for mobile communications and more particularly to a device and method for producing the Quaternary complex quasiorthogonal codes and further use of these developed Quaternary complex quasiorthogonal codes to generate signals channel expansion

The invention relates to digital communication systems in which data is variable speed transmitted without the indication of speed transmission data and received in a coherent receiver, in which the transfer rate of data transferred is determined for use in data processing

The invention relates to the field of generation scramblers codes in mobile communication system

FIELD: radio engineering.

SUBSTANCE: suggested algorithm for quasi-coherent receipt of multi-beam signal with continuous pilot signal is based on algorithm, adaptive to freeze frequencies, for estimation of complex skirting curve, which uses both pilot and information signal. Use of information symbols for estimation of complex skirting curve allows, with weak pilot signal, to substantially increase precision of estimation of said curve and, as a result, significantly decrease possible error of information parameters estimation.

EFFECT: higher interference resistance.

2 cl, 10 dwg

FIELD: communication systems.

SUBSTANCE: device has block for synchronizing clock speeds, input displacement register, commutator, intermediate storage register, memory block, comparison block, threshold block, record control block, count displacement register, reading control block, synchronization signals forming block, commutator, interference level measuring device, additional memory block, channels counter, communication channel.

EFFECT: higher interference resistance.

1 dwg

FIELD: radio engineering.

SUBSTANCE: implementation of soft decisions generating method in case of receiving multi-beam signal allows substantial decrease of complication level of receiver, because it contains lesser amount of one-beam receivers, than a prototype.

EFFECT: increased interference resistance and increased capacity of communications system during receiving of multiple-beam signal due to efficient periodic procedure of renewal of multiple-beam signal components when receiving estimates of components search, also considering mutual influence of signal components.

6 cl, 13 dwg

FIELD: transmission of information, applicable in cellular and satellite communication systems.

SUBSTANCE: the receiver has two frequency converters, two quadrature correlators, phase error filter, controlled oscillator, two control elements, error delay filter, controlled clock oscillator, reference signal generator, two multipliers, two analog-to-digital converter, delay line, demodulator, decoder, two matched filters, phase shifter.

EFFECT: enhanced power efficiency of the communication system.

2 cl, 3 dwg

FIELD: mobile telecommunication systems.

SUBSTANCE: base station receives information, pointing out presence on mobile station of information for transfer. Then, base station transmits information about state of use of physical channels and information about maximal allowed possible data transfer speed. Mobile station receives aforementioned data and transmits access header to base station to request given physical channel, determined on basis of aforementioned data.

EFFECT: higher stability, decreased number of errors during assignment of channel.

3 cl, 52 dwg, 8 tbl

FIELD: data channels in wireless communications system.

SUBSTANCE: for realization of method, base station sends request of booting protocol (BOOTP) to operation and service center, and base station receives IP-address assigned to it from response, dispatched by operation and service center, as a result of which between base station and controller of base stations, operation and service channel is set up. Problem of automatic launch of base station is also solved by this, preventing conflicts of IP-addresses and making it possible to realize parallel launch of base stations.

EFFECT: setting up of Internet-based channel for protocol over asynchronous transfer mode between base station and controller of base stations with default configuration of base station.

6 cl, 7 dwg

FIELD: radio communications; wireless-access, fixed, land mobile and satellite communication systems.

SUBSTANCE: newly introduced in prior-art code-division transmitter (IS-95 standard) are following components: orthogonal M-code generator, two (n + k) modulators, and n + k + j + 1 signal spectrum shaper in transmitter circuit; divider, second coder, multiplier, and second character compactor in each data channel; divider, second coder, and multiplier in each call channel; relevant interconnections to organize new signal-code structure and channel code multiplexing type which has made it possible to enhance spectral efficiency of communication system by more than three times.

EFFECT: enhanced data-transfer spectral efficiency of promising communication systems.

1 cl, 1 dwg

FIELD: radio communications.

SUBSTANCE: in known transmitter with code division of channels (IS-95 standard), new elements are additionally introduced, namely: transmitter circuit additionally features P orthogonal code generators, (N+K+J+1) signal spectrum generator, P channel signal adders, channel group signal adder, and each information channels features a divider, second encoder, interlacing device and second symbol compressor, each call channel features divider, second coder and interlacing device and appropriate connections between them for creation of new signal code structure and of a form of code compression of channels.

EFFECT: more than 3 times increased spectral efficiency of communication system.

5 dwg

FIELD: methods for assigning Walsh space.

SUBSTANCE: in base station and mobile stations a list of Walsh functions is contained. Walsh space pointer is transferred to point at which exactly Walsh functions from the list are used for realizing communication. Walsh space pointer is corrected according to available dynamically changing transmission power, or according to usage of Walsh functions in base station.

EFFECT: assignment of Walsh space for efficient distribution of Walsh space among different users, while minimizing usage of system resources for its distribution.

10 cl, 12 dwg, 5 tbl

FIELD: wireless mobile communication system, in particular, methods and systems for transmitting complex symbols with usage of transmission code matrix.

SUBSTANCE: in accordance to the invention, transmission code matrix is generated with usage of transformed orthogonal codes in such a way, that the code is resistant to static channel characteristics and operates efficiently both in Rician channels and in (correlated) Rayleigh channels. Also, invention provides for high speed transmission of symbols with usage of several transmitting antennas and one or more receiving antennas.

EFFECT: invention simultaneously ensures high order of diversion and high speed of symbol or data transmission.

6 cl, 3 dwg

Up!