# The device forming the group of signal

(57) Abstract:

The invention relates to communication technology and can be used in synchronous or asynchronous address communication systems for sealing signals. The technical result is the possibility of combining and transmitting asynchronous data streams with different speeds, elimination of intra-system interference due to the formation of systems of signals with correlation characteristics, without lateral spikes. This is achieved by the fact that the proposed device for the formation of group signal includes N linear channel converters, N adders, N channel multiplier products, where N= 2^{n-1}n = 1, 2, 3, channel adder and generator reference channel signals. 3 C.p. f-crystals, 4 Il. The invention relates to communication technology and can be used in synchronous or asynchronous address communication systems to seal the signals.Known non-coherent multi-channel communication system (SU N 1141579 A, H 04 J 11/00, publ. 23.02.85, bull. N 7), containing on the transmission side of the transmitter, n switches, the outputs of which across the majority of the unit connected to the first input of the phase manipulator, as well as the generator of the binary code output kazov manipulator and synchroblog, United with synchronator transmitter, and the inputs of the n switches are informational inputs main channels, modulating the inputs of each of the n switches connected to respective outputs of the binary code generator, and at the receiving side connected in series receiver and synchronization unit, and n channels, each of which consists of series-connected first matched filter, a first envelope detector, block compare, key shaper of the main characters of the message, as well as series-connected second matched filter and the second envelope detector, the output of which is connected to the second input of the comparison, moreover, the inputs of the first and second agreed filters each of the n channels are combined and connected to the output of the receiver, and the output of the synchronization unit connected to the control input of the key for each channel, on the transmission side between the output of the phase manipulator and the transmitter input phase difference introduced manipulator, the other inputs of which are informational inputs additional channels, and at the receiving side entered sequentially connected to the adder, the delay line unit calculating a phase difference and de the od which is connected to the output of the synchronization unit, and the outputs of the first and second agreed filters of each channel are connected to respective inputs of the adder. However, this system does not ensure the elimination of intra-system interference, combining asynchronous data streams with different velocities when passing.The closest in technical essence and functionality of the claimed device (prototype) is a device for the formation of group signal (EN N 2027309 C1, H 04 J 11/00, H 04 B 1/66, publ. 20.01.95, bull. N 2) containing N sources, each of which is connected in series through a linear channel Converter and the multiplier is connected with the corresponding input of the adder, the output of which is the output device, while the second input of multiplier products connected to respective outputs of the generator of the reference channel signals, a control input connected to the output of the generator of clock pulses, each of the linear transducers consists of N multiplier products, adder and a memory unit weights.However, the device prototype has the following disadvantages: the presence of intra-system interference, the impossibility of Association and streaming media with the invention is a developing device, ensuring the achievement of the technical result consists in the elimination of intra-system interference, merger and transfer of data streams with different velocities from asynchronous sources of information.This technical result is achieved in that the forming device group signal containing N linear channel converters, where N=2

^{n-1}n=1, 2, 3 ..., channel adder, N-channel multiplier products, N adders and the generator of the reference channel signals, and information inputs of the first and N-th linear channel converters are respectively the first and N-th information input device, and the first output of the first linear channel of the Converter and N-th output of the N-th linear channel Converter connected respectively to the first input of the first and N-th entry of the N-th adders, the output of the i-th adder, where i=1, 2, 3, . . ., N, connected to the first input of the i-th channel of the multiplier, the second input is connected to the i-th generator output of the reference channel signal, and the output of the i-th channel of the multiplier is connected to the i-th input channel adder whose output is the output of the device, each linear channel transmitter with noperm device. Each i-th linear channel transmitter, where i=1, 2, ..., N, provided n control inputs, which is the corresponding control inputs of the device. In addition, the j-th output of each of the i-th linear channel Converter with numbers i=2, 3, ..., N-1, where j= 1, 2, 3, ..., N, is connected to the i-th entry of the j-th adder, the j-th output of the first linear channel Converter with numbers j=2, 3, ..., N connected to the first input of the j-th adder, and the j-th output of the N-th linear channel Converter with numbers j=1, 2, .. ., N-1 is connected to the N-th entry of the j-th adder.Each i-th linear channel Converter consists of N multiplier products, United first inputs are connected to the information input of the linear channel of the Converter, and their second inputs connected to the respective N outputs storage unit weights, N information input of which is connected to the respective N data outputs of the shaping unit weights, and the first output of the shaping unit weights additionally connected with the control input of the storage unit of weight coefficients, n control inputs of the processing unit weights are n managers in the outputs of the i-th linear channel Converter.The generator of the reference channel signals consists of a generator of harmonic signals, the output of which is connected with the first input N-1 multiplier products, with the second input of the first multiplier and is the first generator output of the reference channel signals of the N-1 outputs of the multiplier products are connected respectively to the inputs of N-1 bandpass filters, N-1 outputs of which are connected respectively to the inputs of N-1 amplifiers, N-1 outputs are the i-th outputs of the generator of the reference channel signals, where i=2, 3, ..., N, and N-2 outputs the j-th amplifiers, where j=1, 2, ..., N-2, respectively connected with the second inputs of the N-2 k-th amplifiers, where k=2, 3, ..., N-1.The set of weights consists of N==2

^{n-1}-1 adders modulo two, and i-s control inputs of the processing unit weights, where i= 2, 3, ..., n, are connected in parallel with the second input (2

^{i-1}- 2

^{i-2}) the j-th adders modulo two, where j=2

^{i-1}-1, 2

^{i-1}-2, ..., 2

^{i-1}-2

^{i-2}, the outputs of which are j+1-mi outputs of the shaping unit of weight coefficients, and outputs the q-th adders modulo two, where q=2

^{k-1}+ and k=1, 2, ..., n-1 and =0, 1, ..., 2

^{k-1}connected in parallel with the first inputs of the g-th adders modulo DV is n, are first managing input and the first output of the shaping unit weights.Listed a new set of essential characteristics are provided by the Association for the transmission of asynchronous data streams with different velocities and elimination of intra-system interference, due to the formation of systems of signals with correlation characteristics, do not have side splashes.The invention is illustrated by drawings, showing:

- Fig. 1 - diagram of the device forming group signal:

- Fig. 2 - scheme of the generator of the reference channel signals;

- Fig. 3 is a block circuit diagram of the formation of weighting coefficients;

- Fig. 4 is a diagram of the multiplier included in the linear channel converters.The inventive device to form a group signal, shown in Fig. 1, consists of N linear channel converters 1

_{1}-1

_{N}where N=2

^{n-1}n= 1, 2, 3 ..., channel adder 3, N channel 2 multiplier products

_{1}-2

_{N}N adders 5

_{1}-5

_{N}and generator reference channel signals 4, and inputs the linear channel converters 1

_{1}-1

_{N}are the corresponding N informazioni inputs, which the respective control inputs of the device. N outputs of each of the i-th linear channel Converter 1

_{1}-1

_{N}where i=1, 2, 3, ..., N, are connected to the i-th inputs of the respective N adders 5

_{1}-5

_{N}. The output of the j-th adder 5

_{1}-5

_{N}where j=1, 2, 3, . . . , N, connected to the first input of the j-th channel of the multiplier 2

_{1}-2

_{N}, the second input is connected to the j-th generator output of the reference channel signals 4, and the output of the j-th channel of the multiplier 2

_{1}-2

_{N}connected to the j-th input channel of the adder 3, the output of which is the output device.N linear channel converters 1

_{1}-1

_{N}designed for the formation of the channel signals. They consist of N multiplier products 6

_{1}-6

_{N}a memory unit weights 7, block the formation of weights 8. The first N inputs of multiplier products 6

_{1}-6

_{N}United and connected to the information input of the linear channel of the Converter 1

_{1}-1

_{N}. The second inputs of the multiplier products 6

_{1}-6

_{N}connected to the respective N outputs storage unit weights 7. N information inputs storage unit weights 7 p the th output of the shaping unit weights 8 additionally connected with the control input of the storage unit weights 7. In addition, n

_{1}the control inputs of the processing unit weights 8 are n

_{i}control inputs of the linear channel of the Converter 1

_{1}-1

_{N}. The N outputs of the multiplier products 6

_{1}-6

_{N}are the corresponding N outputs of the linear channel of the Converter 1

_{1}-1

_{N}.The storage unit weights 7 is designed for recording, storage and reading of orthogonal N-bit code. It can be implemented as a parallel register, as described in the book Maltsev JLA., Fromberg E. M. , Yampolsky B. C. Fundamentals of digital technology. - M.: Radio and communication, 1987, S. 38, 39, Fig. 30.The shaping unit weights 8 is designed to generate orthogonal N-bit code and can be implemented according to the scheme shown in Fig. 3. It consists of N=2

^{n-1}-1 adders modulo two 8.1

_{1}-8.1

_{N}and i-s control inputs of the processing unit weights, where i= 2, 3, ..., n, is connected with the second inputs (2

^{i-1}-2

^{i-2}) the j-th adders modulo two 8.1

_{1}-8.1

_{N}where j=2

^{i-1}-1, j=2

^{i-1}-2, ..., 2

^{i-1}-2

^{i-2}, the outputs of which are j+1-mi outputs of the shaping unit weights. The output q's ) inputs g-th adders modulo two 8.1

_{1}-8.1

_{N}where g= 2

^{m}+q, and m=k, k+1,., n-2. United first inputs of the p-th adders modulo two 8.1

_{1}-8.1

_{N}where p=2

^{r-1}, a r=1, 2, ..., n, are the first managing input and the first output of the shaping unit weights.The multiplier products 6

_{1}-6

_{N}intended for receiving the channel signals can be implemented according to the scheme shown in Fig. 4. Each multiplier consists of a modulo two 6.1, item AND NOT 6.2 and differential amplifier 6.3, and the first input of the modulo two 6.1 is the first input of the multiplier 6

_{1}-6

_{N}the second input of the modulo two 6.1 is the second input of the multiplier 6

_{1}-6

_{N}. The output of the adder modulo two 6.1 connected to the first input of the differential amplifier 6.3 and with the two inputs of the element AND NOT 6.2. The output element AND IS NOT 6.2 is connected to a second input of the differential amplifier 6.3. The output of the differential amplifier 6.3 is the output of the multiplier 6

_{1}-6

_{N}.Adders modulo two 6.1, 8.1

_{1}-8.1

_{N}can be implemented as described in the book Korolev, P., Stashuk L. D. Nonlinear radio equipment military communications equipment. Part 2. Pulse and zirovnice P. Korolev,, Stashuk L. D. Nonlinear radio equipment military communications equipment. Part 2. Pulse and digital techniques. - M.; Voenizdat, 1984, c. 100, figure 4.16 b.Differential amplifier 6.3 can be implemented as described in the book Likhachev C. D. a Practical scheme for operational amplifiers. - M.: DOSAAF, 1981, S. 17, Fig. 8.The adders 5

_{1}-5

_{N}designed to add channel signals and the formation of the total signal.Channel adder 3 is designed to add components of the signals from outputs of channel 2 multiplier products

_{i}and forming a group of multifrequency signal.The adders 5

_{1}-5

_{N}and channel adder 3 are linear adders and can be implemented as a differential amplifier, as described in the book Likhachev C. D. a Practical scheme for operational amplifiers. - M.: DOSAAF, 1981, S. 16,17, Fig. 7.Channel 2 multiplier products

_{1}-2

_{N}are used to form components of the signals. Channel 2 multiplier products

_{1}-2

_{N}can be implemented in the form of a balanced frequency converters, as described in the book under the General editorship Teplova N. L. Nonlinear radiotehnicheskie signal, orthogonality which is invariant to phase shifts. It can be implemented according to the scheme shown in Fig. 4, and consists of a generator of harmonic signals 4.1, 4.2 multiplier products

_{1}-4.2

_{N-1}, bandpass filters 4.3

_{1}-4.3

_{N-1}amplifiers 4.4

_{1}-4.4

_{N-1}and the generator output harmonic signals 4.1 is connected with the first input N-1 multiplier products 4.2

_{1}-4.2

_{N-1}a second input of the first multiplier 4.2

_{1}-4.2

_{N-1}and is the first generator output of the reference channel signals 4. N-1 outputs of the multiplier products 4.2

_{1}-4.2

_{N-1}connected respectively to the inputs of N-1 bandpass filters 4.3

_{1}-4.3

_{n-1}. N-1 outputs of bandpass filters 4.3

_{1}-4.3

_{N-1}connected respectively to the inputs of N-1 amplifiers 4.4

_{1}-4.4

_{N-1}. N-1 outputs of the amplifiers 4.4

_{1}-4.4

_{N-1}are the i-th outputs of the generator of the reference channel signals 4, where i=2, 3, ..., N, and N-2 of the outputs of the amplifiers 4.4

_{1}-4.4

_{N-2}connected respectively with the second inputs of the j-th multiplier products 4.2

_{2}-4.2

_{N-1}where j=2, 3, ..., N-1.The generator of the harmonic signals 4.1 can be implemented in the form of a harmonic oscillator oscillations, as described in the book Panfilov, I. P., Darda C. E. Theo who may be implemented as balanced frequency converters, as described in the book under the General editorship Teplova N. L. Non-linear electronic device. - M.: Voenizdat, 1982, S. 130, Fig. 4.28.Bandpass filters 4.3

_{1}-4.3

_{N-1}can be implemented as described in the book Snegirev such as Linear electronic device. The course of lectures. Part 2. - L.: YOU LWVUS, 1989, S. 77, Fig. 2.26.Amplifiers 4.4

_{1}-4.4

_{N-1}implemented as einverseremove amplifier, as described in the book Likhachev C. D. a Practical scheme for operational amplifiers. - M.: DOSAAF, 1981, S. 15, 16, Fig. 6.The claimed device operates as follows.On the i-th information input device and next to the appropriate input of the i-th linear channel Converter 1

_{i}where i=1, 2, .., N, receives a discrete signal of correspondent type z

_{i}. S control inputs of the device, where s=2, 3, ..., n, and next to the appropriate s control inputs of the linear channel of the Converter 1

_{i}enter the addresses of correspondents in the form of (n - 1)-bit binary code. At the first control input device and accordingly the linear channel of the Converter 1

_{i}signal level logical units. In the shaping unit weights 8UB>j

_{=1}with the following properties:

< / BR>

where R

_{ii}- autocorrelation function.From the output of the shaping unit weights 8 orthogonal N-bit code, each element of which represents a weighting factor is applied to the storage unit weights 7, recorded in his cell and then read from them under the action of a control signal from the first output of the processing unit weights 8 to the control input storage unit weights 7. Outputs of the storage unit weights 7 read N weighting coefficients are received at the second inputs of the respective N multiplier products 6

_{j}where j= 1, 2, . .., N, the input of which receives a discrete signal of the reporter z

_{i}. The outputs of multiplier products 6

_{j}linear channel Converter 1

_{i}formed channel signals of the form U

_{ij}= h

_{ij}z

_{i}that arrive at the i-th inputs of the j-th adders. The output of the j-th adder is formed by the total signal as received at the first input channel multiplier 2

_{j}, to the second input of which receives the harmonic signal of multiple frequencies (

_{j}is x 2 multiplier products

_{j}formed components of signals of the form Y

_{j}(t) = U

_{j}sin(

_{j}t), which enter the corresponding j-th input channel of the adder 3. The output channel of the adder 3 is formed group multifrequency signal

Thus, group signal, which represents a system of multi-frequency signals, will be described by an expression of the form

< / BR>

where multi-frequency signal i-ro correspondent.This system {S

_{i}(t)}, where i=1, 2, ..., N, be a system of orthogonal multi-frequency signals, i.e., having the property of full separability, since according to the textbook for high schools (formula (8.4)) Theory of signal transmission/Zuko A., and others-M.: Communication, 1980. C. 260-265

< / BR>

where B

_{ij}- correlation function.In this system of orthogonal multi-frequency signals are absent intersystem interference, i.e. when they are processed in the receiving path, namely, the demodulation of the signals on each of the subcarriers of the frequency multiplying the demodulated signals to the corresponding sequence of h

_{ij}and summing the obtained values of the signals will get:

a) when receiving a signal of its "i-th correspondent (channel)

< / BR>

b) when receiving a signal of an "alien" l-th correspondent (who s there is no interference.An important advantage of forming systems multi-frequency signals is the invariance of the time-correlation function of signals correspondents, since the autocorrelation function of the signals has one main burst at = 0 and the correlation function of different signals equal to zero, i.e., does not require synchronization of different correspondents. The set of weights 8, shown in Fig. 3, operates as follows. At the first input processing unit weights 8 receives a signal of the logic unit, which is supplied to the first inputs of the p-th adders modulo two 8.1

_{1}-8.1

_{N}where p=2

^{r-1}and r=1, 2, ..., n, and then through the first output processing unit weights 8 on the first information and the control input storage unit weights 7. Outputs of the q-th adders modulo two 8.1

_{1}-8.1

_{N}where q = 2

^{k-1}+ and k=1, 2, . . . n-1 I = 0,1,...,2

^{k-1}the signal levels of the logical unit or zero arrives at the input of the g-th adders modulo two 8.1

_{1}-8.1

_{N}where g= 2

^{m}+q, and m=k, k+1, ..., n-2, corresponding to (q+1)-th outputs of the shaping unit weights 8. On the second input (2

^{i-1}-2

^{i-2}) j-s the x inputs 2, ..., n forming unit weights 8 act i-th addresses of correspondents in the form of (n-1)-bit binary code, where i=2, 3, . .., n, the outputs of which (j+1)-s signals at the respective outputs of the shaping unit weights 8. Thus, at the output of the shaping unit weights 8 by performing the logical operations of addition modulo two over binary bits in the address (number) of the correspondent is formed orthogonal code

< / BR>

where i= 1, 2, ..., n-1, j=1, 2, ..., 2

^{n-1}k=[log

_{2}(j-1)] - maximum a power of 2, satisfying the condition 2

^{k}j,

X

_{i}(k+1) - is (k+1)-ro discharge binary representation of the address (number) of the correspondent i.The generator of the reference channel signals 8, shown in Fig. 4, operates as follows. The generator of the harmonic signals 4.1 generates a harmonic signal of the form sin(t), which is supplied to the first generator output of the reference channel signals 8, to the second input of the first multiplier 4.2

_{1}-4.2

_{N-1}and the first input N-1 multiplier products 4.2

_{1}-4.2

_{N-1}. Outputs of N-1 multiplier products 4.2

_{1}-4.2

_{N-1}harmonic signals of the form sin(

_{j}t), where

_{j}= j, and j= 2, 3, . .., N, are received at the line is N-1 amplifiers 4.4

_{1}-4.4

_{N-1}. With amplifiers 4.4

_{1}-4.4

_{N-2}N-2 harmonic signal of the form sin(

_{j}t) are fed to the second input of the i-th multiplier products 4.2

_{1}-4.2

_{N-2}where i=2, .., N-1, j-th outputs of the generator of the reference channel signals 8, where j=2, 3, ..., N. Thus, the generator output of the reference channel signal 8 generated harmonic signals of multiple frequencies of the form sin(

_{j}t), where

_{j}= j, j=1, 2, ..., nThe multiplier 6

_{1}-6

_{N}it is shown in Fig. 4, operates as follows. At the first input of the modulo two 6.1 receives a discrete signal of the form z

_{i}where i= 1, 2, ..., N, to the second input of the modulo two 6.1 signal corresponding to the j-th category of orthogonal N-bit code {h

_{ij}}

^{N}

_{j}

_{=1}. To the inverting input of differential amplifier 6.3 signal from the output of the modulo two 6.1, and the non-inverting input receives the same signal, but passed through the element AND NOT 6.2. Thus, at the output of the differential amplifier 6.3 formed positive or negative signals of the form (1), the corresponding signals with a logic level zero or one at the output of the modulo two 6.1, with the law compliance with the following: level logical is the dignity of the formed systems of multifrequency signals is the invariance of the time-correlation function of signals correspondents, since the autocorrelation function of the signals has one main burst at = 0 and the correlation function of different signals equal to zero, i.e., does not require synchronization of different correspondents. Additionally, the equality to zero of the correlation function of various signals when =0 leads to the absence of intra-system interference in the establishment of a system of orthogonal multi-frequency signals. 1. The device forming the group signal containing N linear channel converters, where N = 2

^{n-1}n = 1, 2, 3 ..., channel adder, N-channel multiplier products, N adders and the generator of the reference channel signals, and information inputs of the first and N-th linear channel converters are respectively the first and N-th information input device, and the first output of the first linear channel of the Converter and N-th output of the N-th linear channel Converter connected respectively to the first input of the first and N-th entry of the N-th adders, the output of the i-th adder, where i = 1, 2, 3 ..., N, connected to the first input of the i-th channel of the multiplier, the second input is connected to the i-th generator output of the reference channel signal, and the output of the i-th channel of the multiplier is connected entrusted each linear channel transmitter with numbers i = 2, 3 ..., N - 1 is equipped with an information input, which is the relevant information input device and, in addition, each i-th linear channel transmitter, where i = 1, 2,..., N, provided n control inputs, which is the corresponding control inputs of the device, the j-th output of each of the i-th linear channel Converter with numbers i = 2, 3 ..., N - 1, where j = 1, 2, 3 ..., N are connected to the i-th entry of the j-th adder, the j-th output of the first linear channel Converter with numbers j = 2, 3, ..., N connected to the first input of the j-th adder, and the j-th output of the N-th linear channel Converter with numbers j = 1, 2, ..., N - 1 is connected to the N-th entry of the j-th adder.2. The device under item 1, characterized in that the generator of the reference channel signals comprises a generator of harmonic signals, N - 1 multiplier products, N - 1 bandpass filters, N - 1 amplifiers, and the output of the generator of the harmonic signals is connected with the first input N - 1 multiplier products, with the second input of the first multiplier and is the first generator output of the reference channel signals of the N - 1 outputs of the multiplier products are connected respectively to the inputs of N - 1 bandpass filters, N - 1 outputs of which are connected respectively to the inputs of N - 1 amplifiers, N - 1 vyhodnotila, where j = 1, 2, ..., N - 2, respectively connected with the second inputs of the N - 2 k-th amplifiers, where k = 2, 3,..., N - 1.3. The device under item 1, characterized in that the i-th linear channel Converter consists of N multiplier products, United first inputs are connected to the information input of the linear channel of the Converter, and their second inputs connected to the respective N outputs storage unit weights, N information input of which is connected to the respective N data outputs of the shaping unit weights, and the first output of the shaping unit weights additionally connected with the control input of the storage unit of weight coefficients, n control inputs of the processing unit weights are n control inputs of the i-th linear channel Converter, moreover, the N outputs of the multiplier products are the corresponding N outputs of the i-th linear channel Converter.4. The device according to p. 3, characterized in that the shaping unit weights contains N = 2

^{n-1}- 1 adders modulo two, and i-s control inputs of the processing unit weights, where i = 2, 3, .. ., n connect the -1 - 2, ..., 2

^{i-1}- 2

^{i-2}, the outputs of which are j + 1-mi outputs of the shaping unit of weight coefficients, and outputs the q-th adders modulo two, where q = 2

^{k-1}+ and k = 1, 2, ... n - 1 and = 0, 1, ..., 2

^{k-1}connected in parallel with the first inputs of the g-th adders modulo two, where g = 2

^{m}+ q, and m = k, k + 1, ..., n - 2, United first inputs of the p-th adders modulo two, where p = 2

^{r-1}and r = 1, 2, . .., n are the first managing input and the first output of the shaping unit weights.

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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, 2^{n} keys (where 2^{n} - number of outputs of Walsh functions generator) and frequency splitter, two elements of one-sided conductivity and 2^{n} additional multipliers, and on receiving side - clock generator, Walsh functions generator, multipliers, integrators, information receivers, 2^{n} keys and frequency splitter, two elements of one-sided conductivity and 2^{n} additional multipliers. As a new addition, on transmitting side two one-sided conductivity elements are inserted and 2^{n} additional multipliers, and on receiving side - two one-sided conductivity elements and 2^{n} 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 PAPR_{0}, is transferred via all carriers, information symbol, value PAPR of which exceeds required threshold PAPR_{0} 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