SU1580575A1 - Transceiver device for transmission of messages with pulse-code modulation - Google Patents

Abstract

The invention relates to communication technology. The purpose of the invention is to reduce energy consumption while ensuring a given level of reliability of reception. For this, the message transmitting / transmitting device with pulse-code modulation contains in the transmitting part encoders 1, combining units of 2 signals, modulators 3, adjustable amplifiers 4 of power, unit of frequency multiplexing 5, elements I 6, elements 1 not 7, the distribution unit 9 of the transmission clock, the framing unit 10 of the frame sync group and the transmitting antenna 19, and in the receiving part, the distribution unit 11 of the reception clock, the frequency decompression unit 12, amplifiers 13, demodulators 14, threshold analyzers 15 of the signal quality, And 16 elements , decoders 18 and receiving antenna 20, as well as synchronizer 8 and electr OR 17. In the entry mode, all amplifiers 4 are switched on to maximum power. The goal is achieved by providing power control for amplifier 4, as well as by providing protection against spurious triggering and accidental distortion of the parallel discharge code of the sync sequence. 1 il.

Description

The invention relates to technology and can be used in radio relay, tropospheric and satellite communication systems. The purpose of the invention is to reduce energy costs in a transmitting device while ensuring a given level of reception reliability.

The drawing shows the structure - the electrical circuit of the proposed transceiver device.

The transceiver unit contains | IT n coders 1, m blocks 2 signal combining, t + 1 modulators 3, n} +1 adjustable amplifiers 4 power} and, block 5 frequency multiplexing, t + 1 elements And 6 , t + 1 HE elements 7, synchronization stock 8, block 9 of distribution of transmission clock pulses, shaper 10 frame sync group — ijibi, reception clock distribution unit 11, frequency attenuation block 12, t + 1 amplifiers 13, t + 1 Demodulators 14 , t + 1 threshold signal quality analyzers 15, t + 1 elements AND 16, element OR 17, n decoders 18, transmitting antenna 1 9, Receiving antenna 20.

The device works as follows.

In the connection mode, all adjustable amplifiers 4 are turned on at maximum power. The sync sequence from block 8 arrives at; input of block 9 with a frequency (n + 1), where F.a is the sampling frequency, and n is the number of information analog signals. From the output of block 9, the pulses are alternately fed to the shaper 10 and n encoders 1. At the output of block 10, the m bit parallel code of the sync sequence is generated, which is fed to the inputs of block 2 and precedes the sequential arrival of m bit codes from n coders 1, which correspond to levels analog signals at their inputs. In this case, each bit of the PCM binary code is transmitted through its own bit channel. Thus, at the output of each block 2, a frame of pulses of the same bits of encoders 1 is formed, i.e. During the transmission cycle, a (n + 1) pulse is transmitted, taking into account the sync pulse. From the output of block 2, all frame sequences are fed to the input m of the module Toro 3 transmission channels, which generate high-frequency signals

Q

5 Q 5

Q

five

five

0

for transmitting bit pulse sequences at their frequency positions, which are amplified with m adjustable amplifiers 4 and combined into (ha + 1) frequency spectrum in block 5, with (t + 1) - frequency position used for transmitting service signal channel output from the serially connected (t + 1) -th modulator and (t + 1) -th adjustable amplifier 4. From the output of block 5, the group signal through the transmitting antenna 19 and the propagation medium is fed to the input of the receiving antenna 20, from the output which enters the entrance b Lock 12. Control pulses for controlling the power of adjustable amplifier 4 are generated in a threshold analyzer 15 and transmitted through the elements AND 16 and NII 17 through the transmitting service channel. From the output of the bit buses, a parallel code from the demodulator 14 is fed to the m inputs of block 8 and m inputs of n decoders 18. In block 8 of synchronization, the parallel code of the sync sequence is decoded, n signals are generated to the control input of each of n decoders 18 with frequency (n + 1), while block 8 provides protection against false triggering and accidental distortion of the parallel discharge code of the synsequence. From the 1st output of the block 11, the clock frequency signals are fed to the control input of the decoder 18, in which the m-bit parallel code is converted into an analog signal, which is fed to the i-th information user. The power control of the adjustable amplifier 4 is carried out as follows: from the output of the 1st amplifier 13 on the receiving side, the signal is fed to the input of the 1st threshold signal quality analyzer 15, which evaluates the signal-to-noise ratio in the 1st frequency channel and compares with the threshold voltage corresponding to the weight of the 1st bit in the output code combination of encoder 1, and the threshold, (m + 1) th threshold analyzer 15, is determined by the required reliability of transmission of service control signals. If the signal-to-noise ratio is higher than the threshold, then at the first input of the 1st element And 16 the signal is logical O (, m + 1), a

 er 1

if it is below the threshold, then the signal is logical 1. At the output of the AND 16 element after the beating of the clock pulse from the 1st output of block 9, a signal of logical 1 or O appears at the i-th input of the element OR 17. At the same time, the 1st output of the block polling 9 is connected to its ith output, delivering sampling pulses to the ith encoder 1, and (and + 1) p. Thus, a logical sequence of 1 and 0 is formed at the input of the OR element 17, each of which corresponds to a control signal at the output one of the threshold analyzers 15, and the sequence of pulses will be synchronous c (t + 1), the first m bit combinations at the inputs of block 2. The remaining part of the frame of the service channel, equal to (n + 1) - (ha + 1), can be used to transmit other service command information. From the output of the element OR 17, a sequence of pulses is fed to the input (t + 1) of the modulator 3 of the service channel and in the group signal is transmitted to the correspondent to the station of which it is allocated by block 12, amplified by (t + 1) -th amplifier 13 and is demodulated by (t + 1) th demodulator 14. From the output of the latter, control pulses go to the first inputs (t + 1) of the NOT element 7, the outputs of which are connected to the inputs (+) increase c (-) decrease output power of (t + 1) th adjustable amplifier 4. Only in the presence of a control pulse does it occur the change in power of the 1st regulated amplifier 4, and if in the pulse train from demodulator 14 at this time position the signal is logical O, then the power will be reduced by OTH, and if the signal is logical 1, then it is increased by UP, where OT is a discrete step change power.

Claims (1)

Invention Formula Transmitting unit for transmitting messages with pulse-code modulation, containing in the transmitting part of n coders, m information channels and a service channel, the outputs of which through the frequency multiplexing unit are connected to the input of the transmitting antenna, the sync-impulse distribution unit transmissions, n outputs of which are connected respectively to the synchronous inputs of the encoders, and information channels - the service channel consists of a series-connected modulator and a regulated power amplifier, and in the receiving part, a receiving antenna, the output of which is through A loop is connected to the inputs of m information channels and a service channel, n decoders (where n is the number of informational messages, am is the number of code bits) and a synchro- nal distribution block for 15 receive pulses, each information and service channel consisting of a series-connected amplifier and demodule the demodulators of each information channel 20 are connected to the input of the corresponding decoder, the synchronous inputs of which are connected to the outputs of the reception clock distribution unit, characterized in that it has been reduced and energy consumption while ensuring a predetermined level of reception reliability, a synchronization unit, an OR element are entered, m signal combining units are entered in the transmitting part, a frame synchronizer pattern generator, t + 1 AND elements and (t + 1) NOT elements, and the inputs of the combining signal blocks are connected with the bit output of the corresponding encoder, and the outputs of the signal combining units are connected to the inputs of the corresponding modulators, and in the receiving part, serially connected 0 analyzer1 are inserted into each information and service channel The signal quality and the AND element, the outputs of the AND elements of each information and service channel are connected to the inputs of the OR element, the output of which is connected to the input of the 5 module of the service channel, and the m inputs of the synchronization unit are connected to the outputs of the demodulators of the corresponding information channels, and the outputs synchronization are connected, respectively, with the inputs of the distribution unit of the clock pulses of the transmission and the distribution unit of the clock pulses of the reception, the outputs of t + 1 elements And and t + 1 elements are NOT connected to the control inputs p Adjustable amplifiers of the corresponding information and service channel, the first inputs of all AND elements and the elements are NOT combined and connected to the output 7 15805758 the modulator of the service channel, and the second bodies of each information channel, and the service of the inputs of the AND elements and the element of the inner channel are connected to the input Hp are combined and connected to a counting signal quality analyzer, the second to the input of an adjustable amplifier; 5 inputs of elements AND of each information component of the corresponding information and service signals of the connection and service channels and also dinene with corresponding clock The input of the distribution unit is the output of the distribution unit of the sync. Inputs of the receive pulses, the output of the asynchronous pulses of the transmission.