Transmitter and method of communication

FIELD: information technology.

SUBSTANCE: when multiplexing control channels for multiple receivers into OFDM character in equal time periods during downstream radio access OFDM is used which contains profile generation module made capable to generate frequencies presentation profile which is individual for transmitter; and frequencies assignment module made capable to assign subcarriers to control channels for multiple receivers according to frequencies presentation profile.

EFFECT: higher quality of receiving information.

11 cl, 20 dwg

 

The technical field to which the invention relates.

The present invention relates to the field of radio communications. More specifically, the present invention relates to a transmitting device and communication method used in a communication system in which transmission on multiple carriers.

The level of technology

In this field of technology is increasingly important to the implementation of broadband wireless access, which is used for the purpose of effective implementation of high-speed communication with high bandwidth. In relation to the downlink as a promising scheme from the point of view of realization of high speed and throughput for the effective suppression of multipath fading (fading in the propagation of the signal through multiple paths) describes the scheme, with many bearing, it is the scheme of multiplexing orthogonal frequency division (Orthogonal Frequency Division Multiplexing, OFDM).

As shown in figure 1, the frequency band used in the system is divided into multiple resource blocks (figure 1 - three resource block), with each of the resource blocks includes one or more subcarriers. The resource block is also called a frequency slice ("cancam", chunk) or frequency block. The mobile station is assigned one or more block is in resources. The technology of dividing the frequency band into multiple resource blocks are described, for example, in the document P.Chow, J.Cioffi, J.Bingham, "A Practical Discrete Multitone Transceiver Loading Algorithm for Data Transmission over Spectrally Shaped Channel", IEEE Trans. Commun. vol.43, No.2/3/4, February/March/April 1995.

If the frequency band is divided into multiple resource blocks, one potcake can be multiplexed multiple control channels (control signals) for multiple users, for which you are planning. On figa-2C show examples of multiplexing control channels for multiple users in one potcake. On figa shows an example of multiplexing control channels for three users (UE1, UE2, and UE3) in one OFDM symbol within podagra. User data is stored (displayed) to the shared data channels, which are multiplexed in one potcake. Figure 2 b shows an example of multiplexing control channels for three users in two OFDM symbol within podagra. On figs shows an example of multiplexing control channels for three users in one potcake. To draw attention to the control channels common channel, the data on figv and 2C are not shown. As can be seen from tiga-2C, the present invention deals with the case, according to which the control channels for multiple users are vodkat, data and control channels are multiplexed into one or more OFDM symbols in the same time intervals.

The control channel contains the information necessary to modulate the shared data channel, and therefore the reception quality of the control channel, it is desirable to improve. On the other hand, if you use the power control of the transmission and the formation pattern of the transmitted signal, there is a problem with the fact that the control channels transmitted by neighboring base stations, can create interference and reduce the reception quality of the control channel. In particular, this phenomenon is exposed to the mobile station at the cell edge.

Disclosure of inventions

Considering the above problems, a common problem to which the present invention is directed, is to improve the quality of reception of the control channel.

One aspect of the present invention relates to a transmitting device that performs multiplexing control channels for multiple receiving devices in the OFDM symbol in the same time intervals when the radio is in the downward direction using OFDM and includes

the generation module profiles made with the possibility of generation of the profile display frequencies for individual transmitting device is STV; and

the assignment module frequency made with the possibility of assigning subcarriers control channels for multiple receiving devices in accordance with the profile of the frequency display.

Another aspect of the present invention relates to a method of communication, according to which the transmitting device performs the multiplexing control channels for multiple receiving devices in the OFDM symbol in the same time intervals when the radio is in the downward direction using OFDM, comprising the following steps:

generation profile display frequencies for individual transmitting device;

the purpose of the control channels for multiple receiving devices for subcarriers in accordance with the profile of the frequency display; and controlling transmission power of subcarriers.

According to the implementation of the present invention can improve the reception quality of the control channel.

Brief description of drawings

Figure 1 shows an example of dividing the frequency band into multiple resource blocks.

On figa shows the first example of the multiplexing of the control channels for multiple users in one potcake.

On FIGU shows a second example of the multiplexing of the control channels for multiple users in one potcake.

On figs shows a third example of multiplexing the deposits of control channels for multiple users in one potcake.

Figure 3 shows the interference when the base station control transmit power.

On figa shows the first example of controlling the transmit power based on the FDM.

On FIGU shows a second example of controlling the transmit power based on the FDM.

On figs shows a third example of controlling the transmit power based on the FDM.

Figure 5 shows an example of controlling the transmit power based on the CDM.

Figure 6 shows the combination control transmission power based on FDM and control transmit power based on the CDM.

7 shows the interference when the base station perform transmission with the formation of the pattern.

On Fig presents a block diagram of a base station in accordance with the first or second embodiment.

Figure 9 is a diagram of the power control in the base station in accordance with the first or second embodiment.

Figure 10 presents a block diagram of a mobile station in accordance with the first or second embodiment.

Figure 11 illustrates the implementation of orthogonalization of the control channels between the different sectors in the frequency domain.

On Fig illustrated implementation orthogonalization of the control channels between the different sectors in the code field.

On Fig Ave is illustrated using the control transmission power based on the FDM between sectors and control transmission power on the basis of the CDM within each sector.

On Fig illustrated using the control transmission power based on the FDM between sectors and control transmission power on the basis of FDM within each sector.

On Fig illustrated using the control transmission power based on the CDM between sectors and control transmission power on the basis of the CDM within each sector.

On Fig illustrated using the control transmission power based on the CDM between sectors and control transmission power on the basis of FDM within each sector.

The following notation is used:

eNB1, eNB2 - base station

UE1, UE2, UE3, UE4 - mobile station

10 - base station

101-1, 101-2 - generation module profiles/module multiplication code

103-1, 103-2 - assignment module frequency

105-1, 105-2 - module power control

107 module IFFT

109 module add a CP (cyclic prefix)

111 - module multiplication with weights

113 - transmission module

20 is a mobile station

201 - receiving module

203 module remove the CP (cyclic prefix)

205 module FFT

207 module demuxing

209 module storage profiles/codes

The implementation of the invention

The following is a description of preferred embodiments of the present invention with reference to the figures of the drawings.

First variantvalue

According to the first variant implementation, the base station controls the transmission power of signals transmitted to the mobile station, the control channels are organized as shown in figa-2C. Controlling transmit power here refers to the change of the transmission power of signals transmitted to the mobile station, to improve the reception quality at each mobile station.

Figure 3 from the axis frequency deferred transmission power when the base station control transmit power. The base station is designated as eNB1 and eNB2, and the mobile station designated as UE1-UE4. If the base station eNB1 performs control of transmission power of signals transmitted to the mobile station UE1 and UE2, which are located within cell 1, which is included in the coverage area of a base station eNB1, the base station eNB1 reduces the transmit power of signals transmitted to the mobile station UE1, which is close to the base station eNB1. At the same time, the base station eNB1 increases the transmission power of signals transmitted to the mobile station UE2, which is far from the base station eNB1. Similarly, if the base station eNB2 performs control of transmission power, this base station eNB2 reduces the transmit power of signals transmitted to the mobile station UE4, which is away close to the base station eNB2. At the same time, the base station eNB2 increases the transmission power of signals transmitted to the mobile station UE3, which is far from the base station eNB2. As shown in figure 3, if the subcarriers corresponding to the control channel transmitted from the base station eNB1 in the mobile station UE2 coincide with the subcarriers corresponding to the control channel transmitted from the base station eNB2 in the mobile station UE3, the control channel for the mobile station UE2 interferes with the control channel for the mobile station UE3, and Vice versa. As a consequence, it is not possible to improve the setting of SIR (signal-to-interference ratio, signal-to-interference"), even if the base stations eNB1 and eNB2 will raise the transmit power.

According to the first variant implementation to solve the above problems, each base station uses the profile display frequency, which is individual for the base station (cell). This approach is called control of transmit power based on FDM (Frequency Division Multiplexing, the multiplexing separation by frequency). The base station uses the profile frequency display, preset for each cell.

More specifically, each base station uses the profile display frequency, which is different from the profile display frequencies of other base stations, so that random is raspredelit provisions (sub-carriers), where placed (mapped) control channels for the respective mobile stations, as shown in figa. For example, a base station eNB1, covering the honeycomb 1 assigns the mobile station UE1 third, fourth, sixth, seventh, tenth, thirteenth and fourteenth subcarriers. Accordingly, the base station eNB1 assigns the mobile station UE2 other subcarriers. On the other hand, the base station eNB2, covering the honeycomb 2, assigns the mobile station UE3 first, third, fourth, seventh, ninth, eleventh and thirteenth subcarriers. Accordingly, the base station eNB2 assigns the mobile station UE4 other subcarriers. This assignment allows you to create areas with a low level of interference and areas with high levels of interference and to reduce the interference between subcarriers.

According to the control circuit transmit power based on FDM, shown in figa, the transmit power of signals transmitted to the mobile station that has the same level for all subcarriers assigned to mobile station. For example, the transmit power of signals transmitted to the mobile station UE1 is determined based on the average reception quality (for example, by setting SINR (signal-to-interference plus noise ratio, signal-to-total interference and noise) in the frequency band of the system to the mobile station UE1. In the alternative, the transmit power may be determined for each subcarrier on the basis of the reception quality for each subcarrier, as shown in figv. Control transmission power for each subcarrier can further reduce the interference observed at the mobile station. In yet another alternative embodiment, the base station may combine subcarriers into groups of subcarriers based on the reception quality of each subcarrier and to determine the transmission power for each group of subcarriers based on the average reception quality for each group of subcarriers, as shown in figs. In yet another alternative embodiment, the base station may combine subcarriers into groups of subcarriers at close distances in the frequency domain and to determine the transmission power for each group of subcarriers. In addition, the base station may use a combination approach integrating subcarriers into groups of subcarriers based on the reception quality and approach integrating subcarriers into groups of subcarriers at close distances in the frequency domain. Thus groups of subcarriers can be organized in several levels.

Alternatively, the base station instead of using the profile display frequencies for individual base stations can multiply the control channels for the respective mobile stations with orthogonal codes in order to achieve orthogonality between mobile stations. This approach is called the feasible power control based on CDM (Code Division Multiplexing, multiplexing code division).

More specifically, the base station multiplies the control channels for the respective mobile stations with orthogonal codes (Walsh codes, the codes of the phase shift (phase shift codes and the like) in order to achieve orthogonality between mobile stations in a code region, as shown in figure 5. According to this approach, the transmit power of signals transmitted to each mobile station is on the same level for all subcarriers. Thus, this approach allows to reduce differences in transmit power (interference) between subcarriers.

As illustrated in Fig.6, controlling transmit power based on FDM and controlling transmit power based on the CDM can be combined. It should be noted that figure 3-5 shows the multiplexed control channels for the two mobile stations, and figure 6 shows the multiplexed control channels for four mobile stations.

Controlling transmit power based on the CDM has the advantage over the control of transmit power based on FDM in relation to the introduction of randomness in the interference. On the other hand, if the number of channels that need to be muxed increases, to control the transmission power based on the CDM requires a greater coefficient of expansion of the spectrum and is similar to the Directorate of the mod is et to be able to ensure orthogonality in a medium with frequency-selective fading. In other words, control of the transmit power based on the CDM has the disadvantage of vulnerability to interference within a cell. On the contrary, controlling transmit power based on the FDM is resistant to interference within a cell, since the signals of multiple mobile stations do not interfere with each other in the frequency domain. When controlling transmit power based on the CDM and controlling transmit power based on the FDM are combined, then the interference can be reduced while maintaining a small coefficient of expansion of the spectrum.

The second option exercise

According to the second variant implementation, the base station performs the formation of the pattern signals in the mobile station, when such an organization of the control channels, as shown in figa-2C. The formation of a pattern refers to the change in the direction of the antenna to improve the reception quality at each mobile station.

7 from the axis frequency deferred power receiving control channels for the respective mobile stations observed at the mobile station UE2 in the case where the base station perform transmission with the formation of the pattern. The base station is designated as eNB1 and eNB2, the mobile station designated as UE1-UE4. When the base station eNB1 done is that the formation of the pattern signals, transmitted to the mobile station UE1 and UE2, which are located within cell 1, the coated base station eNB1, the base station eNB1 changes the orientation of the antenna to improve the reception quality at the mobile station UE2 located far from the base station eNB1. Similarly, when the base station eNB2 transmits with the formation of the pattern, the base station eNB2 changes the orientation of the antenna to improve the reception quality at the mobile station UE3 located far from the base station eNB2. As shown in Fig.7, in case of subcarriers corresponding to the control channel transmitted from the base station eNB1 in the mobile station UE2 coincide with the subcarriers corresponding to the control channel transmitted from the base station eNB2 in the mobile station UE3, the control channel for the mobile station UE2 interferes with the control channel for the mobile station UE3, and Vice versa. As a result, you can decrease the efficiency of transfer with the formation of the pattern.

According to the second variant implementation, similar to the first variant implementation, the described problem is solved due to the fact that each base station uses the profile display frequency, which is individual for this base station (cell). This approach is called the transfer with the formation of the a W pattern based on FDM. Use the profile display frequencies for individual base station, allows you to create areas with a low level of interference and areas with high levels of interference and to reduce the interference between subcarriers, as in the case figa. Alternatively, the base station can multiply the control channels for the respective mobile stations are orthogonal codes. This approach is called the transfer with the formation of the pattern on the basis of the CDM. It allows you to reduce changes in the interference between subcarriers, as in the case of figure 5. In addition, it is possible to combine transfer with the formation of the pattern based on FDM and on the basis of the CDM.

The structure of the base station and the mobile station in accordance with the first or second embodiment

The following describes the structure and operation of the base station with links to pig and 9. The base station 10 includes the following components: modules 101-1 and 101-2 generation profiles/multiplication code, modules 103-1 and 103-2 destination frequency, units 105-1 and 105-2 power control module 107 IFFT (Inverse Fast Fourier Transform inverse fast Fourier transform)module 109 adding a CP (Cyclic Prefix, the cyclic prefix), the module 111 multiplication with weights, module 113 of the transfer. On Fig shows a base station 10 that contains two modules 11-1 and 101-2 generation profiles/multiplication code, two units 103-1 and 103-2 assignment of frequencies and two module 105-1 and 105-2 power control for two mobile stations, however, the base station 10 may include N modules 101 generation profiles/multiplication code, N modules 103 assignment of frequencies and N modules 105 power control for N mobile stations. Alternatively, the base station 10 can use one module 101 generation profiles/multiplication code and several modules 103 assignment of frequencies for multiple mobile stations.

If you are using the control transmission power based on the FDM or transfer with the formation of the pattern based on the FDM, the module 101 generation profiles generates a profile of the frequency display, which is individual for the base station (cell) (step S101). Alternatively or in addition, if you are using the control transmission power on the basis of CDM or transfer with the formation of the pattern on the basis of the CDM, the module 101 generation profiles/multiplication code multiplies the control channels to the mobile stations with orthogonal codes to ensure orthogonalization mobile stations (step S103). If you are using the control transmission power based on the FDM or transfer with the formation of the pattern based on the FDM, the module 103 assigning frequencies assigns subcarriers according to the pros who Yu frequency display (step S105). If you are using the control transmission power on the basis of CDM or transfer with the formation of the pattern on the basis of the CDM, the module 103 assignment of frequencies can assign subcarriers (frequencies) sequentially, starting with the first mobile station 1, as is multiplication with orthogonal codes to ensure orthogonalization mobile stations (step S107). Module 105 power control controls the transmit power based on the reception quality at the mobile stations (step S109). The control channels for the respective mobile stations are multiplexed and converted module 107 IFFT in the orthogonal signals on multiple carriers. Module 109 adding CP adds a cyclic prefix to the orthogonal signals on multiple carriers. Module 111 multiplication with weights multiplies the signals on the weight to change the orientation of the antenna depending on the relative position of the base station and mobile stations (step S111). Module 113 transmission transmits the signal to the mobile station.

On Fig and 9 shows a base station 10, which is implemented as a first variant implementation, and the second variant implementation. If the base station implements only the first one implementation, this base station 10 may be missing module 111 multiplication with weights. If the base station implements only the second Varian the implementation in this base station may be missing module 105 power control.

In addition, the base station may inform the mobile stations of the profile display frequency or orthogonal codes generated by the module 101 generation profiles/multiplication code, through a broadcast channel.

Figure 10 presents the structure of the mobile station 20 receiving the control channel to the mobile station 20 using the profile display frequency or orthogonal codes received through a broadcast channel. Mobile station 20 includes the following components: module 201 of the reception module 203 CP removal module 205 FFT (Fast Fourier Transform, fast Fourier transform)module 207 demux module 209 storage profiles/codes. Module 203 CP removal removes the cyclic prefix from the signals received by the module 201 of the reception, after which the module 205 FFT converts the signals into the frequency domain. Module 209 storage profiles/code stores the frequency profile or orthogonal codes received through a broadcast channel. Module 207 demuxing receives the control channel to the mobile station 20 using the profile display frequency or orthogonal codes.

A third option exercise

According to the third variant of implementation, when a base station implementing TVset floor in a few sectors, the base station orthogonalized control channels between sectors.

Figure 11 presents the diagram, where the control channels orthogonality between sectors in the frequency domain. This approach is called controlling the transmission based on the FDM between sectors. Assigning different subcarriers to the control channels in sectors allows orthogonalizing control channels between sectors. In particular, if the module (103 Fig) assignment of frequencies for sector 1 assigns the subcarriers to the control channels, the module (103 Fig) assignment of frequencies for sector 2 does not assign control channels, the same subcarriers. For example, the base station 10 may include a control module which controls the modules assignment of frequencies by sector of this principle. The control module does not allow the transmission of control channels for sector 2 on subcarriers assigned to the control channels for sector 1.

On Fig presents chart, where the control channels orthogonality between sectors in the code domain. This approach is called controlling the transmission based on the CDM between sectors. The use of different orthogonal codes for channel management allows you to orthogonalizing control channels between sectors. In particular, if the module (101 Fig) multiplication code for sector 1 is sportsuit orthogonal codes, the same orthogonal codes in the module (101 Fig) code multiplexing for sector 2 to the control channels are not used. For example, the base station 10 may include a control module which controls the modules code multiplexing by sector according to this principle. The control module provides the orthogonalization of the control channels for sectors 1 and channel management for sector 2 in the code field.

If the time intervals of transmission of the control channels is synchronized between base stations, it is possible to orthogonalizing control channels between base stations, as in the cases 11 and 12, where the illustrated control channels, orthogonality between sectors. For synchronization of the control channels between the base stations can use GPS (Global Positioning System, global positioning system).

On Fig-16 shows the diagrams that illustrated the orthogonalization of the control channels for the respective mobile stations through the use of a combination of the above approaches. Fig corresponds to the combination of the transmission control based on the FDM between sectors and control transmission power on the basis of the CDM within each sector. Fig corresponds to the combination of the transmission control based on the FDM between sectors and the management is of the transmit power based on the FDM within each sector. Fig corresponds to the combination of the transmission control on the basis of the CDM between sectors and control transmission power on the basis of the CDM within each sector. Fig corresponds to the combination of the transmission control on the basis of the CDM between sectors and control transmission power on the basis of FDM within each sector.

According to variants of implementation of the present invention can be reduced interference between control channels and improved the quality of the reception of the control channel.

This application is based on priority application Japan No. 2006-169443 (filed June 19, 2006), the entire contents of which are incorporated herein by reference.

1. The transmitting device performing the multiplexing control channels for multiple receiving devices in the OFDM symbol in the same time intervals when the radio is in the downward direction using OFDM, which includes a generation module profiles made with the possibility of generation of the profile display frequencies for individual transmitting device designed to change subcarriers, which is the mapping of control channels to multiple receiving devices, depending on the transmitting device, and the control channels for multiple receivers can be displayed with the matter of subcarriers in the frequency band, available for the shared data channel and the control channels for multiple receiving devices and a shared data channel are temporary multiplexing; and the assignment module frequency made with the possibility of assigning subcarriers control channels for multiple receiving devices in accordance with the profile of the frequency display.

2. The device according to claim 1, characterized in that it comprises a module power control, configured to control transmission power based on the average reception quality in the frequency band of the system to one of the receiving devices.

3. The device according to claim 1, characterized in that it comprises a module power control, configured to control the transmit power of each subcarrier on the basis of the reception quality of the respective subcarrier in one of the receiving devices.

4. The device according to claim 1, characterized in that it includes a control module power made with the possibility of Association of subcarriers in a pre-specified number of groups of subcarriers based on the reception quality subcarrier assigned to one of the receiving devices, and with the ability to control the transmit power of each group of subcarriers.

5. The device according to claim 1, characterized in that it includes the module multiplication code executed with the possibility of the multiplication of the control channels for multiple receivers with orthogonal codes to ensure orthogonalization multiple receiving devices, moreover, the assignment module performs frequency assigning subcarriers control channels, multiplied with the orthogonal codes.

6. The device according to claim 1, characterized in that the transmission profile of the frequency display in several receiving devices is accomplished through a broadcast channel.

7. The device according to claim 5, characterized in that the transmission of the orthogonal codes in several receiving devices is accomplished through a broadcast channel.

8. The device according to claim 1, characterized in that a represents a base station, performing cover several sectors; however, the assignment module frequency carries the distinction of subcarriers used for control channels in each of the sectors.

9. The device according to claim 5, characterized in that a represents a base station, performing cover several sectors; the module multiplication code performs the multiplication of the control channels with orthogonal codes differ from each other in each of the sectors.

10. A communication method in which the transmitting device performs the multiplexing control channels for multiple receiving devices in the OFDM symbol in the same time intervals when the radio is in the downward direction using OFDM, comprising the following steps:
generation profile will display the mode frequencies, individual for the transmitting device and intended to change subcarriers, which is the mapping of control channels to multiple receiving devices, depending on the transmitting device, and the control channels for multiple receivers can be mapped to the corresponding subcarriers in the bandwidth available for the data channel and the control channels for multiple receiving devices and a shared data channel are temporary multiplexing; and the assignment of control channels for multiple receiving devices for subcarriers in accordance with the profile of the frequency display.

11. The transmitting device performing the multiplexing control channels for multiple receiving devices in the OFDM symbol in the same time intervals when the radio is in the downward direction using OFDM, which includes the assignment module frequency made with the possibility of assigning subcarriers control channels for multiple receiving devices in accordance with the profile display frequencies for individual transmitting device and intended for the change of subcarriers, which is the mapping of control channels to multiple receiving devices, depending on the transmitting device, and the control channels is for multiple receivers can be mapped to the corresponding subcarriers in the frequency band, available for the shared data channel and the control channels for multiple receiving devices and a shared data channel are temporal multiplexing.



 

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22 cl, 3 dwg, 4 tbl

FIELD: communications engineering.

SUBSTANCE: stationary wireless access system has, as a rule, user's room equipment unit connected through Ethernet interface to personal computer or to local network and base station unit connected through Ethernet interface to network. User's room equipment unit as such is easily installed by user while base station unit is usually mounted on mast at distance of 1 to 5 miles (1/6 to 8 km) from user's room equipment unit. Both the latter and base station unit usually incorporate integrated transceiver/data switch that provides for radio-frequency communications in the range of 2.5 to 2.686 GHz. Multiplexing with orthogonal frequency division of signals is used during transmission between user's room equipment units and base station ones over ascending and descending lines.

EFFECT: provision for using outwardly accessible antenna affording transmission within line-of-sight range.

70 cl, 19 dwg

FIELD: electrical and radio communications; underwater, radio, radio-relaying, and meteorological communication lines.

SUBSTANCE: start-stop communication system that has on sending end signal shaping and transfer unit 1 and on receiving end, receiver 2, amplitude detector 3, low-pass filter 4, first comparator 6, memory device 7, shift register 8, first decoder 9, switch 10, synchronizing unit 11, pulse shaper 12, pulse burst shaper 13, binary counters 14, 17, signal retrieval and storage device 19, and threshold device 5 is provided in addition with newly introduced second comparator 15, RS flip-flop 16, and second decoder 18.

EFFECT: reduced malfunction probability of proposed communication system.

1 cl, 3 dwg

FIELD: mobile telecommunication systems.

SUBSTANCE: device for decreasing relation of pike power to average power signal, sent along N(=2r) sub-bearing lines in transmitting device, having encoders for block encoding of w input data, where r - real number > 2, and output of N code symbols, has: serial-parallel converter for transforming data flow to w-(r-2) parallel data flows, where w - length of information word, first coder for receipt of w/2 parallel data flows from w-(r-2) parallel data flows from serial/parallel converter, block encoding of w/2 parallel data flows and output of N/2 first code symbols, generator of input operators for generation of r-2 data flows of input operators, in accordance to w-(r-2) parallel data flows, and second coder for receiving parallel data flows from serial/parallel converter, which were not received at first coder and (r-2) data flows from input operators, block encoding of received data flows and output of N/2 second code symbols, while r-2 data flows of input operators provide for complementarity of N code symbols.

EFFECT: higher efficiency, higher reliability.

6 cl, 22 dwg

FIELD: engineering of devices and methods for receipt and synchronization in direct digital satellite broadcast system.

SUBSTANCE: satellite system uses modulation with temporal signals separation and single-frequency network of ground-based re-emitting stations, each of which introduces a delay to ground signal. Delay allows to provide for coincidence of time of receipt of early modulated signal in the center of ground broadcasting zone with time of receipt of appropriate late modulated signal, thus improving switching between ground and satellite signals in receiver. Delay also compensates processing delay, occurring during conversion of satellite modulated stream under direct visibility conditions to multi-frequency modulated stream for transmission of satellite modulated stream under direct visibility conditions to user receivers. Delay is also adjusted in accordance to distance difference between each ground-based re-emitting station and satellite and between each station and center of ground-based broadcasting zone. Adjustment as described above optimizes receipt of temporal signals separation modulated and multi-frequency modulated signals by means of synchronization in the center of single-frequency system of phase of multi-frequency modulated signals, re-emitted from re-emitting stations of single-frequency system.

EFFECT: increased quality of radio-signal receipt.

8 cl, 12 dwg

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

FIELD: electric communications engineering, in particular, engineering of multichannel communication systems.

SUBSTANCE: system for transmitting discontinuous information contains at transmitting side information sources, multipliers, adder, clock generator, Walsh functions generator, 2n keys (where 2n - number of outputs of Walsh functions generator) and frequency splitter, two elements of one-sided conductivity and 2n additional multipliers, and on receiving side - clock generator, Walsh functions generator, multipliers, integrators, information receivers, 2n keys and frequency splitter, two elements of one-sided conductivity and 2n additional multipliers. As a new addition, on transmitting side two one-sided conductivity elements are inserted and 2n additional multipliers, and on receiving side - two one-sided conductivity elements and 2n additional multipliers.

EFFECT: decreased frequency band due to decreased effective width of channel carriers spectrum.

6 dwg, 1 tbl

FIELD: engineering of communication systems, using multi-access layout based on orthogonal multiplexing circuit with frequency division.

SUBSTANCE: communication system divides whole range of frequencies onto a set of sub-frequency ranges. Receiver of information about quality of channels receives information about quality of channels for each one of a set of frame cells, occupied during first time span by a set of frequency-time cells, occupied by second time span and a given number of sub-frequency ranges, transferred via check communication channel from receiver. Module for sorting frame cells analyzes information about quality of check communication channels and sorts frame cells in accordance to information about quality of channels. Module for assigning sub-channels, if transfer data exist, transfers data through a frame cell with best channel quality among other frame cells.

EFFECT: increased data transfer speed.

5 cl, 6 dwg

FIELD: electric radio engineering, possible use for increasing quality of electric communication, especially in multi-frequency wireless communication systems.

SUBSTANCE: method for decreasing ratio of peak signal power to its average ratio PAPR in multi-frequency communication systems, in which information symbol is formed by a set of signals, each one of which is centered on one of multiple bearing frequencies, is characterized by the fact that in transmitter a set of bearing frequencies is divided on several sections - subsets of bearing frequencies, information symbol, PAPR value of which does not exceed required threshold PAPR0, is transferred via all carriers, information symbol, value PAPR of which exceeds required threshold PAPR0 is divided on several sub-symbol sections, while number of these sections equals number of sub-carrier subsets, each section of symbol is transferred same as full symbol, wherein data are only transferred on one group of carriers, while other carriers are not modulated, in receiver, arrival of incomplete symbol is identified by analysis of amplitudes of carrier signals, which are not modulated in case of symbol division. Multi-frequency communication system is characterized by construction of receiver and transmitter, adapted for execution of operations, included in proposed method.

EFFECT: preservation of high channel capacity with simplified correction procedure.

2 cl, 12 dwg

FIELD: the invention refers to the field of radio technique and may be used for transmission of information with the aid of signals with orthogonal frequency multiplexing.

SUBSTANCE: the technical result is in increasing accuracy of synchronization of signals with orthogonal frequency multiplexing and that in its turn provides reduction of error possibility at reception of these signals even in such complex propagation conditions as shot-wave range channels. For this in the receiving set of the known equipment two memory blocks, two commutators, a maximum choice selection block, a meter and a time intervals calculation block are introduced.

EFFECT: increases accuracy of signals.

6 dwg

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