Start-stop communication system

 

The invention relates to telecommunication and can be used in wired, radio, microwave and satellite communication systems. Technical result achieved - increase system capacity without increasing energy costs. Start-stop communication system includes an information source (1), the shift register (2), the multiplexer (3), relative to the phase manipulator (4), the transmitter (5), clocks (6, 27), the pseudo-random sequence generator (7), the generator carrier (17), keys (10, 11, 30), binary counters (9, 33), the receiver (19), consistent with a filter (20), the amplitude detector (21), the drive (22), the threshold block (23), differentiating chain (24), the breaker (25), the pulse shaper (26), a storage unit (28), the delay line (29), the demodulator (31), line (35), the scheme (13), the scheme And (14), standby multivibrator (15), modulo two (8), schema, OR (12), a differentiating unit (16), phasers (18, 32), the decoder (34). 3 Il.

The invention relates to telecommunication and can be used in wired, radio, microwave and satellite communication systems.

Known start-stop communication system (H. M. Kanevsky, V. I. Ledovskikh "Transfer disillu message is transmitted probing key", representing amplitude-shift keyed signal, consisting of several elements. However, this system is specially designed for channels with interrupt (dead channels), has a low immunity in General and high level of false alarm probability.

Closest to the present invention is start-stop communication system [1], adopted for the prototype.

The block diagram of the prototype system is shown in Fig.1.

It contains on the transmission side connected in series source 1, register 2, the multiplexer 3, relative to the phase manipulator 4 and the transmitter 5. In addition, connected in series, the first clock pulse 6, the pseudo-random sequence generator 7, the multiplier 8 and the binary counter 9, connected in series generator carrier frequency 10 and the key 11, the output of which is connected to the signal input relative to the phase of the manipulator 4. The generator input clock pulses 6 is connected with engravida information source 1, the second output of the generator 6 is connected to the clock input of the shift register 2, and the third generator output 6 - with the second inputs of the pseudo-random sequence generator 7 and the multiplier 8, the output to the adjustment input of the binary counter 9, the outputs of which are connected by bus with the control inputs of the multiplexer 3. At the receiving side includes serially connected receiver 12, a coherent filter 13, the amplitude detector 14, a memory 15, a threshold unit 16, differentiating the chain 17, the switch 18, the pulse shaper 19, the second clock 20, and a storage unit 21, the output of which is an output device. Moreover, the output of pulse shaper 19 is also connected to control inputs of the circuit breaker 18 and the demodulator 22. The second output of the second clock 20 is connected to second inputs of the demodulator 22 and a storage unit 21, a third input connected to the output of the demodulator 22. In addition, the output of the matched filter 13 through the delay line 23 is connected to the first input of the demodulator 22. The transmission and reception side are connected through the communication line 24.

However, this start-stop communication system has a low throughput.

The invention is directed to improve system throughput without increasing energy costs.

To eliminate this drawback in start-stop communication system containing on the transmission side connected in series istotnie shift is connected to the multiplexer input bus, connected in series to the first clock and the pseudo-random sequence generator, and the generator carrier frequency, the first binary counter and the first key and the second output of the first clock pulses is connected to a clock input of the shift register, and the third output to the second input of the pseudorandom sequence generator, the first output of the first clock pulses is connected to the adjusting input of the first binary counter whose output bus is connected with the control input of the multiplexer, in addition, the counting input of the first binary counter and the control inputs of the first key and the relative phase modulator connected, the output of the first key is connected to the signal input relative to the phase modulator, synchrolift information source connected to the input of the first clock pulses at the receiving side connected in series receiver, the coherent filter, peak detector, the drive, the threshold unit, differentiating chain breaker, shaper pulses of the second clock and the demodulator, and the output of the matched filter is connected to the input of the delay line, the output is Yong with a third input of the storage unit, the second output of the second generator of clock pulses is connected to the second inputs of the demodulator and the memory unit, the transmission and reception side connected through a communication line, introduced on the transmission side connected in series scheme, scheme And waiting for the multivibrator and the second key, the output of which is connected to the input of the first key, in addition, connected in series modulo two and the circuit OR the output of which is connected with the control input of the first key, and a differentiating unit and the first phase shifter, at the receiving side connected in series to the second phase shifter and the third key, and the second binary counter and decoder. On the transmitting side output of the first phase shifter is connected to the third input of the second key, and input with the second input of the second key and the generator output of the carrier frequency.

Synchrolift information source connected to the input schema, the Output of a pseudorandom sequence generator connected to the third input circuit And the input of the differentiating unit, the output of which is connected to the second input circuit And the output of which is connected to the third input of the modulo two, a second input connected to a second input generator/p>At the receiving side the output of the second binary counter bus is connected to the input of the decoder, the output of which is connected with the control input of the third key, the second input connected to the input of the second phase shifter and the output of the delay line. The output of the third key is connected to the input of the demodulator. The second output of the second generator of clock pulses connected to the input of the second binary counter.

In Fig.2 presents a functional diagram of the proposed start-stop communication system, where indicated:

1 - source of information;

2 - the shift register;

3 - multiplexer;

4 - relative-phase manipulator;

5 transmitter;

6, 27, the first and second clocks (GTI);

7 is a pseudo - random sequence generator (SRP);

8 - modulo two;

9, 33, the first and second binary counters;

10, 11, 30 first, second, and third keys;

12 diagram OR;

13 - the scheme is NOT;

14 diagram;

15 - waiting multivibrator;

16 is a differentiating block;

17 - generator carrier frequency (GNC);

18, 32, the first and second phasers;

19 receiver;

20 - coherent filter;

21 - amplitude detector;

22 - drive;

23 - threshold block;

24 - differentiating t is p>

31 - demodulator;

34 - decoder;

35 - line.

The proposed communication system includes sequentially connected information source 1, the shift register 2, the multiplexer 3, relative to the phase manipulator 4 and the transmitter 5. In addition, connected in series, the first GTI 6, the generator SRP 7 and the adder "modulo two" 8, scheme OR 12, the output of which is connected to control inputs relative to the phase of the pointing device 4, the first key 10 and a counter input of the first binary counter 9, the output of which bus is connected with the control input of the multiplexer 3, the output of the first GTI 6 is connected to the installation by the input of the first binary counter 9. Serially concatenated scheme is NOT 13, scheme And 14 waiting multivibrator 15, the second key 11 and the first key 10, the output of which is connected to the signal input relative to the phase of the manipulator 4. Thus the output of the multivibrator 15 is connected to the second input of the differential OR 12. The output of the circuit And 14 is connected to the third input of the adder according to the "module two 8. The generator output SRP 7 is connected with the third input circuit And 14 and through a differentiating unit 16 with a second input circuits And 14. The second output of the first GTI 6 is connected to the clock input of the shift register 2, the third output of the first GTI 6 - in the DAMI schemes are NOT 13 and the first GTI 6. Moreover, the output GNC 17 is connected to a second input of the second key 11 and through the first phase shifter 18 to the third input of the second key 11.

At the receiving side includes serially connected receiver 19, a coherent filter 20, the amplitude detector 21, a memory 22, a threshold unit 23, differentiating the chain 24, the circuit breaker 25, the pulse shaper 26, the second GTI 27, and a storage unit 28 whose output is the output of the receiving side of the communication system. Thus the output of the matched filter 20 through the serial connected delay line 29, the second phase shifter 32, the third key 30 is connected to the first input of the demodulator 31, the output of which is connected to the third input of the storage unit 28. In addition, the output of the delay line 29 is connected to a second input of the third key 30. The output of the pulse shaper 26 is connected to control inputs of the circuit breaker 25 and demodulator 31. The second output of the second GTI 27 is connected to the second inputs of the demodulator 31 and the storage unit 28 and the input of the second binary counter 33, the output of which bus is connected to the input of the decoder 34, the output of which is connected with the control input of the third key 30.

The transmission and reception side are connected through the communication line 35.

Start-stop give up n information symbols ("0" or "1") duration(Fig.3A). At t=0 on the second output clock pulses 6 are formed of n clock pulses (for example, n=4, Fig.3b), which record information symbols in the shift register 2, at its first output is created by a short pulse (Fig.3b), on the leading edge of which is the initial installation of a pseudorandom sequence generator 7 and setting all bits of the binary counter 9 in one state, and the third output is a square wave is composed of (n + 1) Nicolson duration/2 (Fig.3G), which is in block 8 is formed logically with a pseudo-random sequence of the same length coming from the output of the generator 7 (Fig.3D). The positive part of the resulting signal fed from the output of the unit 8 (Fig.3E), is used to control (through the block 12) work units 9, 4 and 10 key. At the time of actions leading edge of the first pulse unit 9 is set in the zero state, opens the key 10, which transmits the vibrations of the carrier frequency in unit 4, and the output of the multiplexer 3 to the input unit 4 receives a zero signal. In the result, the output of block 4 are formed fluctuations of the carrier frequency with an arbitrary initial phase during the time interval/2 standby multivibrator 15, the output of which connects to the output of the key 11, the signal generator 17, is shifted by the phase shifter 18 to/2. At the same time the output signal of unit 14 resets the output of the adder 8, and the output signal of the multivibrator 15 through the block 12 converts the counter 9 in the next state and the output of the multiplexer appears next (n-th information symbol, which is used in block 4 for the manipulation of the carrier is shifted in phase by/2 relative to its initial value. Thus the output is set, and serves as a reference for already the second information pulse (Fig.G).

At the receiving side relative to photomanipulating signal after filtering in the receiver 19 and the agreed - in filter 20 for a single radar pulse duration/2 is supplied to the amplitude detector 21 with the output of the separation capacity. Its bipolar output signal with a triangular pulses optimally accumulate in the block 22 and its output signal is formed, having a form of the autocorrelation function of the fluctuations at the output of the amplitude detector 21, with a maximum value at time T. the Signal that exceeded the threshold V in the block 23, and then differentiated. At the moment of passage of the differentiation through zero in the pulse shaper 26 is formed by a short pulse, which, acting on the interrupter 25, prohibits the receipt of the signal at its input during the time interval TC. In block 31 is demodulated received from the output of the filter 20 and delayed in delay line 29 at time T of the signal. If the neighboring radio pulses have the same initial phase, it outputs the symbol "1", otherwise "0". Getting started unit 31 determines the pulse coming from Pausa from the first output of the generator 27 (Fig.3i). Trailing fronts of these pulses is the decision on the admission of the characters and their fixation in the storage unit 28. Reading data from the block 28 to the output of the system is supplied with pulses from the second output of the generator 27 (Fig.3K).

If on the transmission side at a certain point in time, there was a positive differential signal (Fig.3D) and changed the initial phase of the carrier on/2, then at the receiving side in the generator 27 at the same time creates an additional pulse last pulse of Fig.3i). His temporary position is determined by the counter 33 and the decoder 34. The output signal of the latter connects to the output of the key 30, the signal unit 29 through the phase shifter 32, in which the initial phase offset/2. This eliminates the phase shift introduced into the signal on the transmission side.

Thus, the application of the proposed start-stop communication system allows to increase the system capacity without increasing energy costs.

Unlike well-known in the proposed system for transmission of information are all elements of the clock (i.e. improved throughput by approximately one third), not tolaini second of the adjacent elements is transmitted at the carrier frequency, shifted in phase by/2 relative phase of the first of them. At the receiving side, this phase shift is eliminated. These procedures really allow you to get the specified effect (see, for example, pages 91-92 in the book M. S. Nemirovsky "Digital transmission of information in radio communication): Communication, 1970).

All devices included in the communication system are known. Principles and devices there provided in the book by N. T. Petrovich "Transmission of discrete information channels with phase shift keying): Owls. Radio, 1965. The drive 15 is aligned with the envelope of the receiving signal and can be performed on the delay line with taps with corresponding phasers at them and the adder (see the book of L. E. Varakin "communication System with noise-like signals", M.: Radio and communication, 1985, Fig. 21.4).

The source of information

1. RF patent №2168867, H 04 L 25/00.

Claims

Start-stop communication system containing on the transmission side connected in series source of information, the shift register, multiplexer, relative to the phase modulator and transmitter, and the output of the shift register connected to the multiplexer input bus, connected in series, the first clock generator impul the binary counter, the second output of the first clock pulses is connected to a clock input of the shift register, and the third output to the second input of the pseudo-random sequence generator, and the output of the first clock pulses is connected to the adjusting input of the first binary counter whose output bus is connected with the control input of the multiplexer, in addition, the counting input of the first binary counter and the control inputs of the first key and the relative phase modulator is connected, the output of the first key is connected to the signal input relative to the phase modulator, synchrolift information source connected to the input of the first clock pulses at the receiving side connected in series receiver consistent filter, peak detector, the drive, the threshold unit, differentiating chain breaker, shaper pulses of the second clock, and a storage unit whose output is the output device, and a delay line demodulator, and the output of the matched filter is connected to the input of the delay line, the output of the pulse shaper is connected to control inputs of the breaker and the demodulator, the output of which connection is giving inputs of the demodulator and the memory unit, the transmission and reception side connected through a communication line, characterized in that the input on the transmission side connected in series scheme, scheme And waiting for the multivibrator and the second key, the output of which is connected to the input of the first key, in addition, connected in series modulo two and the circuit OR the output of which is connected with the control input of the first key, and a differentiating unit and the first phase shifter, the output of which is connected to the third input of the second key, and input with the second input of the second key and the generator output of the carrier frequency, synchrolift information source connected to the input schema, the output of a pseudorandom sequence generator connected to the third input circuit And, with the input of the modulo two and the input of the differentiating unit, the output of which is connected to the second input circuit And the output of which is connected to the third input of the modulo two, a second input connected to the second input of the pseudo-random sequence generator, a standby output of the multivibrator is connected to a second input of the circuit OR, at the receiving side connected in series to the second phase shifter and the third key, and a second binary counter, the output of which D. which is connected to the input of the second phase shifter and the output of the delay line, the output of the third key is connected to the input of the demodulator, the second output of the second generator of clock pulses connected to the input of the second binary counter.

 

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FIELD: communications engineering.

SUBSTANCE: proposed band selection method for mobile orthogonal frequency division multiple access communication system includes following steps to classify procedures of band selection between sending end and receiving ends with respect to original band selection process, passband width selection process, and periodic band selection process: determination of source band selection code (SC)number for source band selection process; SC number to request passband width for passband width request selection process and periodic SC number for periodic band selection process; determination of periodic SC deferment value in compliance with periodic SC number, and transmission of source SCs, passband width request SC, periodic SCs, and periodic SC deferment values on receiving ends.

EFFECT: minimized time for band selection access.

22 cl, 3 dwg, 4 tbl

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