SU1278916A1 - Device for transmission and reception of signals - Google Patents

Abstract

The invention relates to radio engineering and communications and can be used to simultaneously transmit powerful and receive weak broadband signals with a limited time of their formation and processing. The aim of the invention is to increase the reliability of transmission and reception of signals due to multi-stage filtering (coding) of the signal on the transmission, its and receiving sides of the device and the introduction of predistortion in the transmitted signal. The device contains on the transmitting side a source of amplitude-modulated signals, block. correction kits, compensation blocks, delay lines, a summator and a communication channel, and on the receiving side, a multi-drop delay line, band-pass filters and an adder. 2 hp ff. 3 il.

Description

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The invention relates to radio engineering and communication, and can be used for the simultaneous transmission of powerful and reception of weak at-band signals with a limited time of their formation and processing.

The aim of the invention is to increase the reliability of transmission and reception of signals.

Figure 1 shows the structural diagram of the proposed device; Fig.2 is a functional block compensation circuit; Fig. 3 is a functional block correction circuit.

A device for transmitting and receiving signals contains (Fig. 1) a source 1 of information amplitude-modulated signals, blocks 2ii-2 of mi correction, blocks 3i - Zm- | compensation, delay lines 4i-4mp, adder 5, communication channel 6, multi-lead delay line 7, band-pass filters 8i-8 e with selectivity below a given (weakly attenuating signals of adjacent frequency bands) and adder 9.

The compensation block contains (Fig. 2) an adder 10, a multi-lead delay line 11, band-pass filters 12: - 12 m with a lower selectivity, adder 13, inverter 14 and adders 15i - 15 m.

The correction block contains (fig. 3) information channels 16i - 16, L - (- i, performed on a band-pass filter 17 with a given selectivity (sufficiently suppressing signals from adjacent frequency bands), band-pass filters IBi-18b with a selectivity below a given, line 19i - 19L + I, delays and attenuators 20i - 20, + 1, inverters 21i-21i, / 2 and adder 22.

The first step of the transmitting side of the device is formed by the 2ii-2if correction blocks and delay lines 4 || -4iN. Each subsequent stage is formed by successive block compensation, correction block 2 and 4 delay lines.

The device works as follows.

The source signal is 1). It is interrupted by band-pass filters 12 correction blocks 2 into N parts in partial frequency bands. In the delay lines 4, code time shifts are introduced in this part of the signal, and they are added to the adder 5 and fed through the communication channel 6 to the input side of the device. At the receiving side, decoding time shifts (equalization delays) are inserted into these parts of the signal by a multi-branch delay line 7, after which the signal parts are again extracted by band-pass filters B and added to the adder 9. At the output of the adder 9, the sum of the reconstructed (delayed) source signal is formed 1 and spurious signals resulting from the passage of parts of the signal through filters of 8 adjacent frequency bands due to the low selectivity of these filters. In addition, the parts of the signals allocated by the filters 8 are distorted due to non-uniformity within the partial frequency ranges of the transmission coefficients of the low-selective band-pass filters 8.

In compensation blocks 3, additional signals with corresponding time shifts introduced by multi-tap delay line 11 are separated from parts of signals of different partial frequency ranges by low-selective band-pass filters 12. The signals of the respective ranges are summed in the adders 15 with the filtered signals of the adjacent ranges, fed to the adders 15 through the inverter 14, and are fed to the inputs of the correction blocks 2.

In the correction units 2, the additional signals are separated from the partial frequency bands allocated by the high-selective band-pass filters 17 by the additional signals by the band-pass filters 18. By the delay lines 19, these signals are combined

Q in time, and attenuators 20 and inverters 21 within the band of a range provide transmission coefficients of correction blocks 2, inverse to the transmission coefficient of their respective band-pass filters 8. Additional signals through the sum 5 matrix 5 and communication channel 6 together with the main ones are supplied to the receiving side, where they compensate for signal distortion caused by the use of low-selective (low-inertia and simple) bandpass filters 8.

Compared to the well-known, the proposed device allows to increase the reliability of transmission and reception of signals with the same number of band-pass filters with a selectivity lower than specified

g filters). Due to the use of each filter of the receiving side to separate additional signals of N-1 channels, the number of channels (as well as coding steps while maintaining the number of channels) is increased by N-1 times while the number of band-pass filters with a given selectivity is not significantly increased.

The proposed device has high adaptability due to the use of uniform blocks and filters on the transmitting and receiving sides.

Claims (3)

1. An apparatus for transmitting and receiving signals, comprising on the transmitter side a source of information signals and a delay line, the outputs of which are connected to the corresponding inputs of an adder, the output of which is connected to the input of a communication channel, on the receiving side - a delay line whose input is connected to the output of the channel connection, the outputs of the delay line are connected through appropriate band-pass filters to the inputs of the adder, the output of which is the output of the device, characterized in that, in order to increase the reliability of the transmission and reception of the signal The groups of correction blocks and compensation blocks are entered into it on the transmitting side, the outputs of the correction blocks of each previous group are connected directly to the inputs of the corresponding delay lines and through the corresponding compensation blocks to the inputs of the corresponding correction blocks of each subsequent group, the output of the information signal source is connected to the inputs correction blocks of the first group. 2. The device according to claim 1, characterized in that the compensation unit contains adders, a delay line, filters and an inverter, the output of the first adder is connected to the input and the delay line, the outputs of which are connected to the inputs of the corresponding filters, the outputs of the filters are connected to the corresponding inputs of the second adder and the first inputs of the corresponding third adders, the output The second adder, connected via an inverter with the second inputs of the third adders, the inputs of the first adder and the inputs of the third adders are respectively the inputs and outputs of the correction unit. 3. The device according to claim 1, characterized in that the correction unit comprises an inverter, an adder and in each information channel a serially connected filter, a delay line and an attenuator, the filter output of each previous information channel is connected to the filter input of each subsequent information channel, the odd attenuator outputs information channels are connected to the corresponding first inputs of the adder, the outputs of the attenuators of the even information channels are connected via corresponding inverters with the second inputs to The adder, the filter input of the first data channel and the adder output are respectively the input and output of the correction unit. cfJu.Z (re.e.