Multi-channel 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 the reduction of the pulse power of the transmitter and the provision of start-stop mode. To do this in a multichannel communication system introduced on the transmission side is connected in series to the pulse counter and the multiplexer, 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. 2 Il.

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 communication lines.

Known multi-channel communication system with a transmitting-side coding unit, consisting of driver signals the address transfer and shaper group with whom, decoder, synchroblog and shaper of the address signals are received (and.with. N 907834 H 04 J 11/00). The former group signal are combined here to multiplier products and the adder in the block of signal processing - 2tochannel processing and in the final device - adders and crucial blocks.

However, the known communication system is complex and expensive, has low reliability and does not provide start-stop mode.

The closest to the technical nature of the present device is a multichannel communication system according to the patent of Russian Federation N 2103827, H 04 J 11/00, H 04 Q 11/00 adopted for the prototype.

Diagram of the device of the prototype is shown in Fig. 1, where indicated:

on the transmission side:

2 encoding the block;

3 - synchronizer;

4 - time manipulator;

5 transmitter;

6 - synchroblog;

at the receiving side:

8 receiver;

9 is a consistent filter;

10 comparator;

11, 12, the first and second memory blocks;

13 - decoder;

14 - block of sample and hold signal;

15 - synchroblog;

16 - shaper pulses;

17 is a binary counter;

the 20 line.

It contains on the transmission side encodes the block 2, sosumi system, (K+1)-th and (K+2)-th (K=1,2...) inputs connected, respectively, with the first and second outputs of the synchronizer 3, the transmitter 5, the connected input to output temporary manipulator 4, and synchroblog 4, the inlet of which is connected with the second output of the synchronizer 3, and the output connected to the second input of the transmitter 5. At the receiving side is connected in series receiver 8, a coherent filter 8, the comparator 10, the first storage unit 11, the second storage unit 12 and the decoder 13, the block of the sample and hold signal 14 signal input which is connected to the output of the matched filter 9, the clock input to the output of the comparator 10, and the output connected to the second signal input of the comparator 10, and connected in series synchroblog 15, the inlet of which is connected to the second clock output of the receiver 8, the pulse shaper 16 and the binary counter 17, the outputs of which are connected to respective signal inputs of the first storage unit 11, moreover, the clock input of the comparator 10 is connected to the output of the shaper 16 pulses, the second clock inputs of the block of the sample and hold signal 14 and the binary counter 17 is combined with a clock input of the second storage unit 12 and is connected to the output of synchroblog 15. Transmitting and S="ptx2">

The lack of a prototype system is a high peak power, so the system cannot be used in start-stop mode.

To eliminate this drawback in a communication system with a transmitting-side encoding unit consisting of a synchronizer and time manipulator, (n+1)-th and (n+2)-th (where n = 3, 4...) the inputs of which are connected with the first and second outputs of the synchronizer, output temporary manipulator connected to the input of the transmitter, and synchroblog, the inlet of which is connected to the second output of the synchronizer, and the output of synchroblog connected to the second input of the transmitter; on the receiving side is connected in series receiver, the coherent filter, a comparator, the first and second memory blocks and the decoder, K (where K = n and m = 1,2...) outputs which are output communication system, in addition, connected in series synchroblog, shaper pulse and a binary counter whose outputs are connected to the signal inputs of the first storage unit, respectively, the input synchroblog connected to the synchronizing output of the receiver, the output of pulse shaper connected to the first clock input of the comparator, a second clock input of which is connected to a, and the clock input unit sampling and storage - with the comparator output, a second clock input of a binary counter connected to the input block sample and hold signal and the first clock input of the second storage unit, and the output of the transmitter connected to the receiver input line entered on the transmission side is connected in series to the pulse counter and the multiplexer, at the receiving side is connected in series drive and a threshold unit. And K inputs of the multiplexer are the input of the system, and n outputs connected to n inputs of the coding unit, and the input of the pulse counter is connected with the second output of the synchronizer. The first output synchroblog connected to the first clock input drive, the second output of synchroblog connected to the second clock input of the drive and the input block sample and hold signal, the second output of which is connected to the third input of the drive. The output of the threshold unit is connected with the second clock input of the second memory block.

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

on the transmission side:

1 - multiplexer;

2 encoding the block;

3 - synchronizer;

8 receiver;

9 is a consistent filter;

10 comparator;

11, 12, the first and second memory blocks;

13 - decoder;

14 - block of sample and hold signal;

15 - synchroblog;

16 - shaper pulses;

17 is a binary counter;

18 - drive

19 - threshold block;

the 20 line.

Multi-channel communication system includes a transmitting-side multiplexer 1, K inputs, which are inputs of the system, the encoding unit 2, consisting of a synchronizer 3 and temporal manipulator 4, the first n inputs of which are connected to the outputs of multiplexer 1, (n+1)-th and (n+2)-th - connected, respectively with the first and second outputs of the synchronizer 3, the transmitter 5 is connected to the output of the temporary manipulator 4, synchroblog 6, the inlet of which is connected with the second output of the synchronizer 3, and the output connected to the second input of the transmitter 5, and the pulse counter 7, and outputs connected to the control inputs of the multiplexer 1 and the input to the second output of the synchronizer 3. At the receiving side is connected in series receiver 8, a coherent filter 9, a comparator 10, the first storage unit 11, the second storage unit 12 and the decoder 13, the block sampling and storage is of narator 10, and the output connected to the second signal input of the comparator 10, connected in series synchroblog 15, the inlet of which is connected to the second clock output of the receiver 8, the pulse shaper 16 and the binary counter 17, the outputs of which are connected to respective signal inputs of the storage unit 11, and connected in series drive 18 and the threshold unit 19, the output of which is connected to the third input of the storage unit 12, and the clock input of the comparator 10 and the first clock input of the drive 18 is connected to the output of the pulse shaper 16, the second clock inputs of the block of the sample and hold signal 14, the binary counter 17 and the drive 18 is combined with a clock input of the storage unit 12 and is connected to the second output synchroblog 15, and the signal input of the drive 18 is connected to the output of the sample and hold signal 14. The transmission and reception sides of the system are connected through the communication line 20, the outputs of the decoder 13 are system outputs.

Multi-channel communication system operates as follows.

On the transmission side K = mn (m 1, n = 3; 4) synchronous channel signal consisting of symbols "1" and "0" duration T in parallel form, are divided into m groups of n C is s inputs of the multiplexer 1. On the second output of the synchronizer 3 are formed (m -1) short pulses with a repetition period T/m, and the leading edge of the first one coincides with the beginning of the channel symbols. At this point in time, the counter 7 is set in one state, the output of the multiplexer is transmitted n symbols of the first group of input symbols and the output of the temporary arm 4 at the moment s= ST/m2n(where S is the value of the input binary number in decimal form) on it is formed into a rectangular pulse (or pseudo-random signal) of duration T/m2nequal to the repetition period of short pulses from the first output of the synchronizer 3. Thus, each combination of channel symbols of the first group of characters corresponds to one of the 2ntemporary provisions of the output signal of unit 4 at the time interval T/m. Upon receipt of the second pulse from the second output of the synchronizer 3 the output of the multiplexer 1 is transmitted symbols of the second group of input symbols and the procedure of forming the second group of signal, etc. Received total group signal with the synchronization signals coming from synchroblog 6 and bearing information about the beginning of the channel symbols convey together with interference from the output of the receiver 8, optimally processed in a consistent filter 9 and is supplied to the signal inputs of the comparator 10 and the sample and hold signal 14. The inputs of the unit sample and hold signal 14, the binary counter 17 and the storage unit from the second output unit 15 serves m short pulses with a period of T/m, the first of which coincides with the beginning of the group signal when receiving. On its trailing edge is zero block of the sample and hold signal 14, the binary counter 17 and the storage unit 12. The first output of synchroblog 15 are formed two pulse intervals of time T, the first of which corresponds in time to the beginning of the group signal, and the second end. On the first pulse at the output of the pulse shaper 16 is formed m2nshort pulses with a period T/m2ncorresponding time possible positions of the maxima of the filtered signals. At the time the first of them (leading edge) of the output signal of the matched filter 9 is supplied to the comparator 10 and compared to the level of the signal input at the second signal input block sample and hold signal 14 (in this case zero). If it is larger than the latter, then at the end which allows it to remember the level of the output signal of the matched filter 9. This procedure is repeated 2ntime. As a result, by the time of arrival of the second pulse from the second output unit 15 in the block of the sample and hold signal 14 is recorded the highest level of the output signal of the matched filter 9 during the time interval T/m. Binary n-bit counter 17 is designed to count the number of pulses coming from the output of the pulse shaper 16. Whenever the output of comparator 10 appears a voltage drop readings n bits of the binary counter 17 is recorded in the storage unit 11. This allows you to fix the number of temporary positions most of the output signals of the matched filter 9 on the time interval T/m. In the time of arrival of the second pulse from the second output synchroblog 15 number recorded in the storage unit 11 is recorded in the block 12, and the above procedure is repeated (m-1) times, resulting in the storage unit 12 are recorded all m non-temporary positions most signals. In moments of action of the front edges of the pulses of current at the second output unit 15, the drive 18 accumulates the output signals of the block of the sample and hold signal 14. If in the moment of action poslednego creates momentum which, acting on the third input unit 12 reads its output in parallel form all m recorded therein numbers. The decoder 13 explicitly converts an input number K of channel symbols, which in the absence of interference coincide with the transmitted information symbols.

Upon receipt of the following K channel characters (possibly after a certain period of time in start-stop mode), the system operates in a similar way. This communication system can be used to transmit binary information from the same source, if the message is presented in parallel form.

Thus, the proposed multi-channel communication system allows to reduce the peak power of the transmitter and to provide a start-stop mode.

The prototype in essence is an M-ary communication system with M=2to(see S. 161 - 163 in the book of L. E. Burkina "communication Systems with noise-like signals". M. : Radio and communication, 1985). The peculiarity of this system is that a substantial reduction in energy costs per binary symbol occurs only when you change the value of M from one to three or four (Fig. 7.6), so the use of large values is impractical. And the TES seal group signals when the value of M=n=3,4.

In communication systems the main purpose of the clock to provide clock pulses at the receiver. If there are pauses between the individual messages (start-stop systems) he also must provide the specified probability of false alarm (see S. 323 ibid) and even with their relatively small length in the prototype to have considerable energy, which would lead to a reduction in the overall efficiency of the system. In the proposed system to reduce the probability of false alarm is used, the accumulation of information pulses and comparing the sum with a threshold. Calculations show that when m = 4 and n = 3 (and T = 0.2 MS) this system provides the probability of false alarm for the day of order 10-3that corresponds to one false alarm receiver for 1000 days.

The specified technical solution is not known.

Multi-channel communication system with a transmitting-side encoding unit consisting of a synchronizer and time manipulator, (n + 1)-th and (n + 2)-th (where n = 3, 4...) the inputs of which are connected with the first and second outputs of the synchronizer, output temporary manipulator connected to the input of the transmitter, and synchroblog, whose input is connected to the second is - connected in series receiver, the coherent filter, comparator, the first and second memory blocks and the decoder, K (where K = m n, m = 1, 2...) the outputs of which are the outputs of the communication system, in addition, connected in series synchroblog, shaper pulse and a binary counter whose outputs are connected to the signal inputs of the first storage unit, respectively, the input synchroblog connected to the synchronizing output of the receiver, the output of pulse shaper connected to the first clock input of the comparator, a second clock input connected to the output of the sample and hold signal, signal input connected to the output of the matched filter, and the clock input unit sampling and storage - with the comparator output, a second clock input of a binary counter connected to the input block sample and hold signal and the first clock input of the second storage unit, and the output of the transmitter connected to the input of the receiver communication line, characterized in that the input on the transmission side is connected in series to the pulse counter and the multiplexer, the inputs of which are information system inputs and n outputs connected to the inputs of the coding block, whereas the United drive and a threshold unit, the output of which is connected with the second clock input of the second storage unit, the first output synchroblog connected to the first clock input drive, the second output of synchroblog connected to the second clock input of the drive and the input block sample and hold signal, the second output of which is connected to the third input of the drive.

 

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