The device is sending and receiving multi-channel signals

 

(57) Abstract:

The invention relates to electrical engineering and can be used to increase the number of channels that are transmitted in a given frequency band. To solve the problem in the known device on the transmitting side of each of the N channels contains m subchannels, each of which consists of series-connected band-pass filter, the phase shifter, frequency Converter and amplifier, and to the second input of the frequency Converter connected to the generator subcarrier frequency, and the amplifier output of each subchannel in each channel connected to the appropriate input channel adder outputs (-) N-channel adders connected to the corresponding inputs of the group adder, the output of which is connected to the second input of the modulator, the output of which through group filter is connected to the communication line, and on the receiving side of the detector output connected to the input of each of N channels, each of which contains m subchannels, each of which consists of series-connected band-pass filter, frequency Converter, the phase shifter and amplifier and to the second input of the frequency Converter connected to the generator subcarrier cha adder, output (-) each of which is connected to the input of the corresponding recipient. 1 Il.

The invention relates to electrical engineering and can be used, in particular, to increase the number of channels that are transmitted in a given frequency band, i.e., to increase the speed of information transfer.

Known devices for transmitting and receiving multi-channel signals with frequency division multiplexing (CRC): "fundamentals of multi-channel communication", edited by Bobrovskaya N. K., M., Bond, 1975, S. 25; "multi-link" Sincerel A. M., Baeva N. N., Turecki N. With. These devices allow for the transfer of a relatively small number of channels in a given frequency band, as they do not use the possibility of increasing the number of channels by converting the spectrum of the channel signal on the transmission and the inverse transform of these spectra at the reception.

Closest to the invention is a device described in the monograph "theoretical foundations of multi-channel communication". M, Chapman and hall, 1985, (S. 108 - 110), M. C., Gitlin, A. Y. Lev.

This is a device for transmitting and receiving multi-channel signals with CRC contains on the transmission side N of message sources connected sooooo the adder, and on the receiving side of the N channels, N recipients, serially connected band-pass filter and the detector, and the input of the bandpass filter is connected to the communication line.

However, this device allows you to transmit in the frequency band F only N channels

< / BR>
where

F1- frequency band allocated for channel 1.

This number of channels is relatively small.

The problem to which this invention is directed to increase the number of channels that can be transmitted in a given frequency band. This means that in a given frequency band will be given a large number of channels or a specified number of channels will be transferred to a lower frequency band.

For the solution of the problem in the device containing on the transmission side N of message sources connected respectively to the inputs of the N channels, the modulator to the first input of which is connected to the generator carrier frequency, and group adder, and at the receiving side of the N channels, N recipients, serially connected band-pass filter and the detector, and the input of the bandpass filter is connected to the communication line on the transmission side, each of the N channels contains m podkovala frequency and amplifier, and to the second input of the frequency Converter connected to the generator subcarrier frequency, and the amplifier output of each of the m sub-channels in each channel connected to the corresponding input channel of the adder, and outputs each of the N channel adders connected to the corresponding inputs of the group adder, the output of which is connected to the second input of the modulator, the output of which through group filter is connected to the communication line, and at the receiving side of the detector output connected to the input of each of N channels, each of which contains m subchannels, each of which consists of series-connected band-pass filter, frequency Converter, the phase shifter and amplifier, and to the second input of the frequency Converter connected to the generator subcarrier frequency, and the amplifier output of each of the m sub-channels in each channel connected to the appropriate input channel adder, the output of each of which is connected to the input of the corresponding receiver of the message.

In Fig.1 presents a diagram of the device containing N sources of messages 1.1 - 1.N; on the losing side in each of N channels, each of the m subchannels transmitting filters FFR 2.1.1 - 2.N.m.; transmitting the phasers PRFV 3.1.1 - 3.N.m.; predeominately PRU 6.1.1 - 6.N.m.; in each channel channel adder 7.1 - 7.N; group adder 8, the modulator 9, the generator carrier frequency 10, group filter 11; at the receiving side group filter 12, a detector 13, in each of N channels, each of the m subchannels reception filters TFM 14.1.1 - 14.N.m.; receiving frequency converters PMPC 15.1.1 - 15.N.m.; foster generators subcarriers frequencies SGP 16.1.1 - 16.N.m.; foster phasers PMPV 17.1.1 - 17.N.m.; reception amplifiers PMU 18.1.1 - 18.N.m.; in each of the N channels of the receiving channel adder 19.1. - 19.N.; the recipient of the message 20.1. - 20.N.

In this device to transfer the first message source information 1.1 is converted using m parallel chains of series-connected PRF, PRFV, PRPC, PWG, PRU in a random process, which aurally perceived as noise. On receiving this noise using parallel coupled between the detector 13 and channel adder 19.1 chains of cascaded TFM, PMPC, SGP, PMPV, PMU is converted back into the original message of the first source of information 1.1. Messages other sources of information for transmission using relevant for each channel m parallel chains of series-connected PRF, PRFV, PRPC, PWG,tion. Messages remaining (N-1) sources do not interfere with the reception of the 1st message 1st recipient.

The essence of this seal channel on the transmission and, accordingly, separation of the channels at the reception is that for each channel, you must select a different channel, a set of m parallel chains, consisting of a series of PRF, PRFV, PRPC, PWG, PRU on transmission and TFM, PMPV, PMPC, SGP, PMU at the reception. Consequently, the m parallel chains at the reception 14.1.1 - 14.1.m; 15.1.1 - 15.1.m; 16.1.1 - 16.1.m; 17.1.1 - 17.1.m; 18.1.1 - 18.1.m; for 1 channel fully compensate for the distortion introduced to the signal of 1st channel m parallel chains on the transfer 2.1.1 - 2.1.m; 3.1.1 - 3.1.m; 4.1.1 - 4.1.m; 5.1.1 - 5.1.m; 6.1.1 - 6.1.m, so that recovers the original signal of 1st channel. However, these m chains at the reception did not compensate for the distortions caused m parallel chains for transmission in the message of the 2nd, 3rd, etc. N-th channels. I.e. at the entrance of the recipient 20.1 of the first channel messages other sources remain noise and do not interfere with the reception of the 1st message, because when a large m noise from other channels for messages 1-th channel is very small. For example, if m = 10, the average power of the useful signal of the 1st one frequency channel F1passed N messages N channels, i.e., the number of channels in a given frequency band F1increases N times. Consequently, the speed of information transmission at a given frequency F1increases N times. The separation of the N channels at the reception is carried out by converting the spectra of messages of each of the N channels, compensating the conversion of the spectra, which are entered into data signals for transmission. These transformations for the different channels are different.

The device operates as follows. The voltage U1(t) from the first source (the first channel) is fed to the input m parallel to the PRF 2.1.1 - 2.1.m, which divides the spectrum of the signal at m stripes:

U1(t)=U11(t)+U12(t)+...+U1.m(t)

Voltage U11(t) ... U1.m(t) with the outputs of the respective PRF is fed to the input of the corresponding PRPC in which the transfer voltage U11(t) . .. U1.m(t) from one part of the spectrum of the original signal to another, i.e. part of the spectrum "change" to each other about their "places" in the total spectrum of the signal U1(t), which occupies the frequency band F1. Due to this, the signal U1(t) on the hearing is perceived as thermal noise and its spectrum becomes bet separate the spectrum of the signal U1(t) so that enough energy is evenly distributed in the band F1. Output PRPC 4.1.1 - 4.1. m will get the voltage that arrives at the inputs of the respective PRFV. Phasers PMPA11...1.min voltage , which is converted into a voltage U11(t) ... U1.m(t) move their phase shifts other than phase shifts in other channels, which results in the seal at the limit and channel separation at the reception. Voltage outputs PRFV arrive at the inputs of the respective PRU, the gain of which K11... K1.mchosen so that the energy of the signals at the outputs of the spring are the same, and the spectrum of the generated process Y1(t) at the output of the channel adder 1 channel 7.1 uniform in the band F1. The transformed signal Y1(t) on the hearing is perceived as noise. Similarly converted message U2(t) of the second source message 1.2. However, the bandwidth and the average frequency bandwidth of the filters of the 2nd channel 2.2.1-2.2.m differ from the corresponding parameters of the PRF of the 1st channel 2.1.1-2.1. m discussed above. The generated voltage U2.1(t) ... U2.m(t) with the output of the PRF 2nd channel 2.2.1-2.2.m arrive at the inputs of the tote F1and the law by which these movements are in the 2nd channel other than 1 channel. Similarly, the phase shifts2.1...2.mthat give PRFV 2nd channel 6.2.1-6.2.m other than1.1...1.mfor the first channel. The gain of K2.1... K2.mfor PRU 2nd channel 6.2.1-6.2.m is also different from the K1.1... K2.m. Formed at the entrance of the channel adder 7.2 2nd channel process Y2(t), and Y1(t), perceived by the ear as noise.

Similarly, formed the transformed signals Y1(t) + ... + YN(t), which are summarized in the group adder 8 so that the group received signal Z(t) = Y1(t) + ... + YN(t). This signal is carried out in the modulator 9, for example, amplitude modulation (or FM or FM), coming from the generator 10. Group filter 11 removes spurious frequencies that can occur when the AM, so get the signal to normal (this is true for FM, FM):

Uam(t) = Um[I + m Z(t)] cosot

This signal through the communication line arrives at the receiving filter 12 and then to the amplitude detector 13, which generates an output signal Z(t). This group signal Z(t) = Y1(t) + ... + YN(t) is fed to the input m N parallel the filter TFM 14.1.1 equal to the filter parameters of the PRF 2.1.1, i.e., these filters are the same. Similarly, the same filters FFR 2.1.2 and TFM 14.1.2 and so on, the same filters TFM 2.1.m and PRF 14.1. m. I.e. the output TFM 14.1.1 will receive the signal at the output TFM 14.1.2 signal and so on, the output TFM 14.1.m will get U1.m(t) = K1.mU1.m(t). These signals are fed to the input of PMC, which shifts the spectrum of the input signals so that they "returned" to the places where they were located in the original signal U1(t). I.e. the output PMPC receive signals . These signals pass through PMPV 17.1.1 - 17.1.m. When this signal passes through PMPV 17.1.1, in which the phase of this signal is shifted by the value (-11) , i.e., the compensated phase shift11the resulting signal in PRFV 3.1.1, i.e., the signal becomes a signal K11U11(t). Similarly, the signal at the output PMPV 17.1.2 receives a phase shift of (-12) into the signal K12U12(t); and so on is converted into a signal K1.mU1.m(t). Further, the signal K11U11(t) received at the input of PMU 18.1.1., the gain is equal to K-111i.e. the output PMU 18.1.1 get the signal U11(t). Similarly, the output PMU 18.1.2 with gain K-112receive signal K12U12(t) K-112U12(t), the many-channel adder 19.1, at the output of which will receive the sum of: U11(t)+U12(t) + ... + U1.m(t), i.e., the signal U1(t), which came from the 1st source of the message (see formula 1). The converted signals of the other channels: Y2(t) ... YN(t) is also fed to the input of the first m TFM of the first channel. The parameters of the m parallel chains 14.1.1 - 14.1.m, 15.1.1 - 15.1.m, 16.1.1 - 16.1.m, 17.1.1 - 17.1.m, 18.1.1 - 18.1. m agreed only with the signal Y1(t) of the first channel and transform Y1(t) in U1(t); however, these parameters are not consistent with the parameters Y2(t) ... YN(t). Therefore, the transformed signals Y2(t) ... YN(t), passing through inconsistent with their m chains of the first channel, remain noise and hearing are perceived as background noise is low.

The following m parallel chains 14.2.1 - 14.2.m, 15.2.1 - 15.2.m, 16.2.1 - 16.2.m, 17.2.1 - 17.2.m, 18.2.1 - 18.2.m agreed with the transformed signal of 2nd channel and transform Y2(t) in U2(t) 2nd source (2nd channel). Similarly, the m parallel chains 14.N.1 - 14.N.m, 15. N. 1 - 15.N.m, 16.N.1 - 16.N.m, 17.N.1 - 17.N.m, 18.N.1 - 18.N.m agreed with YN(t) and transform YN(t) in UN(t) - message N-th source (N-th channel).

We show that the application of the proposed device R is in the specified frequency band of one channel F1. Let 1-th channel is transmitted to the certainty of a single rectangular pulse:

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N-th channel may is passed a single pulse of the same duration T, but of opposite polarity:

< / BR>
If you do not apply the proposed device, the signals from the 1-th and N-th channels simultaneously fed to the input of modulator 14. It is obvious that the voltage U1(t) and UN(t) are mutually destroyed, i.e., U1(t) + UN(t) = 0 and messages 1-th and 2-th subchannel are not transmitted. Obviously, there is a complete overlap of the signals of the individual subchannels and the separation of the subchannels is not happening.

In the proposed device, these subchannels are separated. Indeed, the spectrum of the signal U1(t) is equal to:

< / BR>
Bandwidth transmitting filters are selected so that the amplitude of the oscillations at the output of the filters were approximately equal. Suppose for definiteness that is used 11 filters, and spectrum width S1() are equal . Then the bandwidth of the PRF should choose is: . For a given signal U1(t) amplitude (energy) of the oscillations at the output of each of the 11 FFR will be approximately equal. Phase shifts of frequency components U1(t) in transmitting the phasers will choose 0othe RA). There may be other laws alternation. The voltage at the output 11 of the phasers of the 1st channel is:

< / BR>
The voltage Y1(t) to the input of the adder 7.1. Simultaneously, the voltage of the N-th channel U1(t) passes through m parallel coupled spectra. These filters may be identical RFLP 1st channel although in principle it is possible to use the PRF with otherto. For simplicity, assume that their characteristics are the same. However, the phase shifts in the N-th channel are different, for example: 0othat 0o, 180o, 180o, 180othat 0o, 180o, 180othat 0o, 180othat 0o. The output voltage PRFV 3.N.1 to 3.N.m the following considering the fact that SN() = -S1() :

< / BR>
The voltage U11(t) is also fed to the input of adder 7.2. It is obvious that the output of detector 13, we get the sum of the voltages U1(t) and UN(t) . This amount acts on the input of the m chains 14.1.1 - 14.1.m. The bandwidth of the RX filters is equal to the bandwidth of the respective transmission filters of the 1st channel, and phase shifts in foster phasers opposite phase shifts in PRFV, i.e. they are equal to: 0othat 0othat 0o, - 180o, - 180o, - 180othat 0o, - 180o, - 180o1(t) supplied to the recipient 20.1. The signal of the N-th channel also passes through the receiving filters and phasers 1st channel. But they do not compensate for phase shifts of the transmitting phase of the N-th channel, and therefore the signal U1(t) is delivered to the recipient 20.1 in the form of noise interference.

Calculation of the voltage at the output of receiver 1 channel gives the following results: maximum voltage signal of 1st channel +U0the maximum voltage signal of the N-th channel -0,1 U0the ratio of the instantaneous capacity .

Increasing the number of landing PRFV, TFM, PMPV, we increase the signal-to-noise ratio.

The device is sending and receiving multi-channel signals on the transmission side N of message sources connected respectively to the inputs of the N channels, the modulator to the first input of which is connected to the generator carrier and group adder, and at the receiving side is N channels, N recipients, serially connected band-pass filter and the detector, and the input of the bandpass filter is connected to the communication line, otlichayushiesya United bandpass filter, the phase shifter, frequency Converter and amplifier, and to the second input of the frequency Converter connected to the generator subcarrier frequency, and the amplifier output of each of the m sub-channels in each channel connected to the appropriate input channel adder, the outputs of the N-channel adders connected to the corresponding inputs of the group adder, the output of which is connected to the second input of the modulator, the output of which through group filter is connected to the communication line, and at the receiving side of the detector output connected to the input of each of N channels, each of which contains m subchannels, each of which consists of series-connected band-pass filter, frequency Converter, the phase shifter and amplifier and to the second input of the frequency Converter connected to the generator subcarrier frequency, and the amplifier output of each of the m sub-channels in each channel connected to the appropriate input channel adder, the output of each of which is connected to the input of the corresponding recipient.

 

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