Start-stop communication system

 

(57) Abstract:

The invention relates to electro - and radio and can be used to transfer multi-channel and single-channel messages in start-stop and continuous modes on the radio, microwave, optical and space lines of communication. The technical result consists in a pulsed transmitter power and the provision of start-stop mode. To do this in a multichannel communication system introduced on the transmission side connected in series to the pulse counter and the multiplexer, and at the receiving side is connected in series drive and a threshold unit. This achieves a probability of false alarm for the day of order 10-3that corresponds to one false alarm receiver for 1000 days. 3 Il.

The invention relates to electro - and radio and can be used in wired, radio, radio-relay and meteor scatter communication lines.

Known communication system for continuous transmission of discrete information, which before each message is sent "sounding key. If you receive this signal, the receiver opens for registration messages and after administration sends a receipt on the backward channel. Otherwise kvitancii /1/. However, this communication system has a low immunity, and in start-stop mode - an unacceptably high probability of false alarm.

Closest to the proposed communication system is start-stop communication system /1/.

It contains (Fig. a) on the transmission side connected in series source 1 information, the delay element 2, the adder 9, the generator 13 of the carrier frequency (GNC), and the transmitter 10 and the generator 11 pseudo-random sequence (gpsa), whose input is connected to the second output of the source 1 information connected to a clock input of the delay element 2, and its output to the second input of the adder 9, and the third source output 1 information connected with the second inputs of the gpsa 11 and the transmitter 10, and at the receiving side is connected in series receiver 14, a band-pass filter (BPF) 15, amplitude detector (AD) 16, subtractive unit (IU) 17, the switch 18, a coherent filter (SF) 19, crucial unit (RU) 20, the imaging unit 21 of the pulse (PHI) and the second critical device 34, connected in series to the second PF 24, the inlet of which is connected to the output of the receiver 14, and HELL 25, is connected by the output to the second input 17 WU, output VU 17 is connected to the second input PN 34, third, fourth and FIF is the Torah output PHI 21 is connected to a second output of circuit breaker 18. The transmission and reception side system connected through a communication line 33, and its output is the output of the second PN 34.

This communication system operates as follows.

Source 1 information creates a random time on the first output message consisting of n binary symbols of the same duration T, and the second and third outputs at the beginning of the message - the grid's short clock pulses with a repetition period T and a positive pulse, respectively. In gpsa 11 is formed of the synchronization signal is a pseudorandom sequence of S binary characters of the same duration as the information, and the message is delayed in the delay element 2 at a time equal to S x T. as a result, the output of the adder 9 is formed of a sequence of clock and messages. The elements of these signals are used to control the frequency GNC 13. The received frequency-shift keyed signal is amplified in the transmitter 10, enabled by the pulse duration (n + S) T acting on the third output AI 1, and transmitted over the communication line 33.

At the receiving side after total filtering in the receiver 1 is demodulated received signal is the unit PN 20 is the first measurement channel. In RU 20 compares the output signal SF 19 with a threshold and, if exceeded its signal shaping at the point of action of the maximum short pulse, which in the absence of noise exactly coincides with the end of the clock. On the positive edge of this pulse on the first output unit PHI 21 is delayed by a time T creates a grid of 2n short clock pulses with a period T, while the second - pulse duration - n T, who with the help of circuit breaker 18 disables the input SF 19 from the outlet WU 17. In the second PN 34, the second measurement channel, in the moment of action of clock pulses is modular accumulation of n signal elements of a message, add the amount received with the output signal SF 19 at the time of the last pulse at the output of the PHI 21, the comparison of the result with a threshold and, if exceeded, issuing messages to the system output.

However, this communication system has a low immunity and requires energy to the transmission clock.

It should be noted that the first measurement channel is a device optimal measurement temporary position xing equipment radio systems". Radio and communication, 1986).

The invention aims to improve the noise immunity of communication and excluding energy transfer clock.

This is achieved by the fact that in the start-stop communication system on the transmission side connected in series introduced the key phase difference manipulator and the second key, connected in series, the third key, the second phase difference manipulator and the fourth key, the inverter and the second output of the generator carrier frequency, and inputs the first and third keys are connected to the output of the delay element, the outputs of the second and fourth keys are connected respectively with the first and second inputs of the adder, the output of which is connected to the transmitter input, the second inputs of the first and second phase difference manipulators connected respectively to first and second outputs of the generator carrier frequency, and third inputs to the second output of the information source, the second inputs of the first and second keys are connected with the output of the inverter, and the second inputs of the third and fourth keys - generator output SRP connected to the input of the inverter, and at the receiving side it entered sequentially connected to the second generator of the SRP, the first input connected to the output form the delay line, the fifth key, the demodulator MDF signals and the circuit OR connected in series, a second delay line, the sixth key and the second demodulator MDF signals, the output of which is connected to the second input circuit OR the input of the first delay line coupled to the output of the second bandpass filter, and the input of the second delay line with the output of the first bandpass filter, a second input of the fifth key and the first demodulator MDF signals connected to the output of the second generator of the SRP, and the second inputs of the sixth key and the second demodulator MDF signal output of the second inverter, the third inputs of the first and second demodulators MDF signals connected to the first output of the pulse shaper.

In Fig. 1 and 2 show respectively a functional diagram of the proposed start-stop communication system and timing diagrams that illustrate its operation.

Start-stop communication system includes a transmitting side is connected in series source 1 information, the delay element 2, key 3, the phase difference of the arm 4, the second key 5, connected in series, the third key 6, the second phase difference positioner 7 and the fourth key 8, and the third input key 6 is connected to the output of the delay element 2, posledovatel the purpose, connected in series generator 11 of the SRP, the output of which is connected to the second inputs of the third 6 and fourth 8 keys, and the inverter 12, the output of which is connected to the second inputs of the first 3 and second 5 keys, and the generator 13 of the carrier frequencies, and the second source output 1 information connected to the clock inputs of the delay element 2, the first 4 and 7 second phase difference manipulators, the signal inputs are connected respectively to first and second outputs of the generator 13 of the carrier frequencies, and the clock input of the generator 11 SRP, a second input connected to the third output of the source 1 information the first and second inputs of the adder 9 is connected respectively to the outputs of the second 5 and the fourth 8 keys, and at the receiving side is connected in series receiver 14, a band-pass filter 15, the amplitude detector 16, subtractive device 17, the switch 18, a coherent filter 19, a crucial device 20, the imaging unit 21 of the pulses, the second generator 22 of the SRP and the inverter 23, connected in series, the second band-pass filter 24, the inlet of which is connected to the output of the receiver 14, and the amplitude detector 25, the output of which is connected to the second input of subtractive device 17, connected in series with the delay line 26, fifth th key 31 and the second demodulator 32 MDF signals, the output of which is connected to the second input of the circuit 29, OR, with the inputs of the first 26 and second 30 delay lines connected respectively to the outputs of the second 24 and the first 15 of bandpass filters, the input of a casting device 20 is connected to the second input of the second generator 22 of the SRP, the output of which is connected to the control inputs of the fifth key demodulator 27 and 28 MDF signals, the output of the second inverter 23 is connected to control inputs of the sixth key 31 and the second demodulator 32 MDF signals, clock inputs of the blocks 28 and 32 are connected to the output of the shaper 21 pulses, the second output of which is connected to a second input of circuit breaker 18; reception and transmission side of the communication system are connected through the communication line 33, its output is the output of the circuit 29 OR.

Start-stop communication system operates as follows.

Source 1 information creates a random time on the first output message consisting of n binary symbols of the same duration T (Fig. 2 (a), and on the second and third outputs at the beginning of the message - a grid of (n + 3) short clock pulses with a period T (Fig. 2 b) and a positive pulse, respectively. In the generator 11 is formed of the synchronization signal is pseudo-random, posledovatelnoy delayed in item 2 on two bars (Fig. 2 g). The keys 6 and 8 are opened by the positive pulses of the SRP, coming from the output of block 11, and the keys 3 and 5 its inversion output unit 12. As a result, the time interval 0-T key 3 is opened and the input unit 4 due to the lack of the message will receive a zero signal. On the signal input of the latter enters one of the carrier frequencies produced by the generator 13, which in this situation with its initial phase will be transferred to its output and the output of the key 5. Further, when the input unit 4 through the key 3 characters of the message, "0", the phase of the carrier frequency at its output remains the same, while under the influence of the symbol "1" is changed to the opposite. Thus the phase difference shift keying (MDF) the first carrier frequency by the characters of the message corresponding to the time-zero elements of the SRP (Fig. 2D). Similarly formed MDF signal at the second carrier frequency by 6-8 blocks corresponding to the characters of the message that coincides with characters SRP "1" (Fig. 2 e). This procedure allows to obtain at the output of the adder 9 FM MDF oscillation, in which the characters of the SRP are passed through to the world Cup, and the messages using MDF. These fluctuations are amplified in the transmitter, open Imola total filtering of the signal in the receiver 14, the signal is fed to a frequency discriminator, consisting of blocks 15-17, 24 and 25, which generates at its output a bipolar signal, the elements of which in the absence of noise exactly match the characters "0" and "1" of the SRP, is formed on the transmission side. After matched filtering in the filter 19 at the output of the latter at the end of the SRP signal is formed of a high level, and in the final device 20 in an optimal way is determined by the time position of its maximum, and at this time the output is formed by a short pulse. With regard to him in the imaging unit 21 of the pulses at the first output delay time T are n + 2 short clock pulses (Fig. 2 W) and pulse duration (n + 2)T, prohibiting through the circuit breaker 18 is received on the next blocks, and the output unit 22 is the same SRP as the generator 11. Blocks 26-32 are used for demodulation of the symbols of the message transmitted on two carrier frequencies. The first signal carrier frequency after a delay time equal to ST, unit 30 passes through the key 31, which is opened at the moment of time corresponding to the zero elements of the SRP, to the input of the demodulator 32 MDF signal, which is demodulated signals with phase difference of the manipulation on this frequency. Analogo blocks 28 and 32 characters are combined into a single message in the schema 29 OR. Thus, we achieve increased robustness of communication and the elimination of energy transfer clock.

Indeed, in the proposed system to send the message, use MDF, which compared with the WRC has a higher noise immunity. All elements of the trigger it are transmitted together with the information and do not require additional energy consumption. Moreover, if S 11 the probability of a false detection of the synchronization signal is of the order less 10-15. For all real values of T such false alarm probability corresponds to an average of one false alarm for a few or more days. So the need for the accumulation of elements of the message (as in the prototype) isn't here.

All blocks included in the communication system, are well-known devices. Various schemes phase difference manipulators are shown, for example, on pages 146-155 in the book by A. M. Driveways and other "phase difference modulation, "Communications", 1967. For the purposes of demodulation MDF signals can be used digital demodulator there, discussed in article L. J. Lipkin and A. A. Shishkov ("Electrosvyaz", N 2. 1973, S. 47-51).

In Fig. 2B in the application for simplicity Korotkaya channels with feedback from the interrupt. "Electrosvyaz", N 2, 1970.

2. G. B. Volobuev, V. I. Ledovskikh. About immunity start-stop communication system with frequency shift keying signal. "Theory and technique of radio communication", vol. 2, 1998.

Start-stop communication system containing on the transmission side connected in series source of information and a delay element, an adder, generator carrier frequency, the transmitter and the pseudo-random sequence generator (SRP), whose input is connected to the second output of the information source that is connected to a clock input of the delay element, and the third output of the information source connected to the second inputs of the generator of the SRP and the transmitter and at the receiver side is connected in series receiver, the first band-pass filter, the first amplitude detector, subtractive device, a breaker, a coherent filter, solver and shaper pulses, connected in series, a second band-pass filter, an input connected to the output of the receiver, and the second amplitude detector, the output of which is connected to the second input of subtractive device, and the second output of the pulse shaper is connected to a second input of circuit breaker, characterized in that the transmitting side of the TRANS is but United is the third key, the second phase difference manipulator and the fourth key and the inverter, and the inputs of the first and third keys are connected to the output of the delay element, the outputs of the second and fourth keys are connected respectively with the first and second inputs of the adder, the output of which is connected to the transmitter input, the second inputs of the first and second phase difference manipulators connected respectively to first and second outputs of the generator carrier frequency, and the third input to the second output of the information source, the second inputs of the first and second keys are connected with the output of the inverter, and the second inputs of the third and fourth keys - generator output SRP, connected to the input of the inverter, and at the receiving side it entered sequentially connected to the second generator of the SRP, the first input connected to the first output of the pulse shaper and the second with the release of a casting device, and a second inverter, connected in series, the first delay line, the fifth key, the first demodulator phase difference modulated (MDF) signals and the circuit OR connected in series, a second delay line, the sixth key and the second demodulator MDF signals, the output of which is connected to the second input circuit OR the first is about a bandpass filter, the second inputs of the fifth key and the first demodulator MDF signals connected to the output of the second generator of the SRP, and the second inputs of the sixth key and the second demodulator MDF signal with the output of the second inverter, the third inputs of the first and second demodulators MDF signals connected to the first output of the pulse shaper.

 

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