The multi-way transmission of digital signals


(57) Abstract:

Usage: in telecommunication, communication systems, code compaction and separation channels (signals). The essence of the invention: enhancing protection of sealed channels from mutual interference is achieved by the fact that the losing party in each of the N channels channel signal formed by amplitude, which is the difference of the amplitude of the transmitted useful information signal and the amplitude of the interference in the channel seal, then the received channel signals condense. 1 Il.

The invention relates to telecommunication and can be used in communication systems with parallel transmission of information, also for sealing wire, radio relay and satellite communication lines.

Goal is to improve security of sealed channels from mutual interference.

The drawing shows a block diagram of the device forming group signal, illustrating the proposed method.

The device contains an element of subtracting 1, multiplier 2, the generator 3 channel filters, an adder 4, block 5 calculate the correction voltage, the memory element 6.

Working diagram of the device forming group signal is of duration T with amplitude1WITH2. . . WITHN. In the j-th unit 5 calculates the voltage correction amplitude information signals, second input unit 5 continuously signals in the form of a constant voltage amplitude equal to the value of the corresponding correlation coefficients Vi1Vi2. . . ViN, i j. The received pulse correction voltage Cjis subtracted from the corresponding information of the pulse amplitude Cj. All operations are performed without delay, so the adjusted pulse amplitudes C, i= , proceed to the appropriate multiplier products 2, where they are multiplied with the channel signals Si(t) are summed in the adder 4, and issued in the transmitter.

Evaluate the effectiveness of the claimed method of signal transmission. When you change the amplitude information signals simultaneously in all channels in accordance with the calculated values of U, i= get a group signal

Xg(t) = CiSi(t), where

Ci= Ci+ CiCi= CiVij,

and the voltage of the report at the output of the j-th corrector

U= Ci+ Ci)Vij+ V =

Compare the capacity of interference before and after the correction of the amplitude information SIM> = = (N-1)V2,

and after correction

PRR= D CiV (N-1)V2(N-1)V2(N-1)2V4< / BR>
Hence, the average gain of the mode of transmission of signals is equal to RRR/PRR= 1/(N-1) V2,

and it will take place at the V < 1/.

The MULTI-WAY TRANSMISSION of DIGITAL SIGNALS, where N is formed reference quasiorthogonal signals, such signals of all channels is folded, the aggregate signal is transferred into a high-frequency region, amplify and transmit over the communication channel, wherein the sealing signal of each channel is formed by multiplying the corresponding j-th reference quasiorthogonal signal to a rectangular pulse with amplitude Cjiwhere j = and Cjidetermined by the formula

Cij= Cj- Cirij,

where rijthe correlation coefficient of the i and the j-th reference quasiorthogonal signals;

Cij = value of the amplitudes of the transmitted digital information signals.


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