SU773939A1 - Device for simulating binary communication channel - Google Patents

Description

one

The invention relates to telecommunications technology and to be used, for example, in experimental studies of the effectiveness of code-based binary information protection against errors.

A device for simulating a binary communication channel is known, which contains a Q random number sensor, the outputs of which are connected to the inputs of the first and second comparison units, the additional inputs of which are connected to the outputs of the first memory and the second memory, respectively, the corresponding inputs of which are interconnected The OUTPUT of the first comparison unit is connected to the first input of the trigger, the second input of which is co-. JQ is dinene to the first output of a binary signal source, the second output of which is connected to the input of a synchronization unit, the outputs of which are connected to the synchronization inputs of a random number sensor, the first and second comparison blocks, and the first and second memory blocks, while the output is trigger connected to the entrance

gers 1 receiver

However, the known device has a low simulation accuracy.

The purpose of the invention is to improve the accuracy of modeling.

To do this, a device for simulating a binary communication channel, containing a random number sensor, whose outputs are connected to the inputs of the first and second comparison blocks, the additional inputs of which are connected to the outputs of the first and second memory blocks, respectively, the corresponding inputs of which are interconnected, The first comparison unit is connected to the first trigger input, the second input of which is connected to the first output of the binary signal source, the second output of which is connected to the input of the synchronization unit, the outputs which are connected to the synchronization inputs of the random number sensor, the first and second comparison blocks and the first and second memory blocks, while the trigger output is connected to the receiver input, a third comparison block, a third memory block, a pulse generator and a counter, whose outputs are connected to the inputs of the third memory block, the outputs of which are connected to the inputs of the first and second blocks of p. In addition to the inputs of the third comparison unit, the additional inputs of which are connected to the inputs of the second comparison unit, the output of which is connected to the installation inputs of the pulse generator, the third memory block and the counter, the additional input of which is connected to the additional input of the third memory block and the first output of the pulse generator, the second output of which is connected to the control input of the third comparison unit, the output of which is connected to the stop input of the pulse generator. The drawing shows a structural electrical circuit of the device for simulating a binary communication channel. The device contains a sensor 1 random numbers, the first 2 and second 3 blocks of comparison, the first 4 and second blocks of memory, trigger .6, the source of the binary signal, block 8 of synchronization, the receiver 9, as well as the third block of comparison, the third 11 block of memory , a generator of 12 pulses and a counter 13. The device’s action is based on the following events played by Monte-Carlo methods :. A - the transmitted information symbol of the source to distort,, B - the current state of the channel to be changed; C - the next number of the channel state is equal to K, where. To 1.2 ... N {TN. The completion of each event is recorded by hitting a random number 4 in one of the sections into which the interval (0.1) is divided. The length of the segment is {equal to the probability of the occurrence of this event: the second constant for a given state). The fact of hit is recorded by the first 2, second 3 and third 10 blocks of comparison, each of which solves the logical equation:. 2 (and,)

Z - logical variable

Where; fe is a random number from a set of numbers with a uniform distribution in the interval (0,1);

U.J is a constant.

Comparison blocks 2 ,, 3 and 10 are identical. The device operates according to the cycles specified by the sync pulses of the source 7 of the binary signal. Let in the previous cycle of operation. From the first 4 and second 5 blocks, the memories in the first 2 and second 3 blocks are compared, respectively, to the probability of a distortion.

A device for simulating a binary communication channel containing a random number sensor, the outputs of which are connected to the inputs of the first and second comparison blocks, the additional inputs of which are connected to the outputs of the first and second memory blocks, respectively, the corresponding inputs of which are interconnected, with the output of the first block comparing the symbol {and the probability P of changing the i-ro state of the channel. The signal S. from the synchronization unit 8 from the output of the random number generator 1 receives a random number to the first inputs of the first 2, second 3 and third 10 comparison blocks. Signal S 2 reads solutions from the first 2 and second 3 comparison blocks. The signal from the first 2 comparison block is distorted, or the next information signal arriving on the trigger 6 is not distorted. The signal from the second 3 comparison block reads the contents of counter 13 as a new address Y in the third 11 memory block, the counter 13 is zeroed and the pulse generator 12 is started . Since the address is Y for the third 11. the memory unit is common with the address of the first 4 and second 5 memory blocks, then with the arrival of the signal S, the last, new values of probability are read from them and to the first 2 and second 3 comparison blocks, respectively. Then a cycle of determining the number of the future state of the imitating communication channel along the micrograph of the acts set by the general generator of 12 pulses occurs. The frequency of the pulses emitted by the pulse generator 12 is chosen to be much more than the clock frequency of the source 7 of the binary signal. For each pulse of the pulse generator 12, the reading of the counter 13 increases by one and reads 3 (Probability reading at the previously fixed address Y from the third 11 memory block to the third 10 comparison block) at its second input. Third 10 comparison block by the read signal The impulse to stop its operation enters from the pulse generator 12. In this case, the counter of the channel 13 (the Y coordinate value of the third 11 memory block) is fixed to which it is to be transferred by a signal from the output the second 3 comparison block, which is meaningful to change the state (event c). Further, the operation of the device is similar.

The first input of the trigger, the second input of which is connected to the first output of the binary signal source, the second output of which is connected to the input of the synchronization unit, the outputs of which are connected to the clock inputs of the random number generator of the first and second comparison blocks and the first and second memory blocks. the trigger output is connected to the receiver input, characterized in that, in order to increase the simulation accuracy, a third comparison unit, a third memory block, a pulse generator and a counter, whose outputs are connected, are entered the inputs of the third memory block, the outputs of which are connected to the inputs of the first and second memory blocks and the inputs of the third comparison block, the additional inputs of which are connected to the inputs of the second comparison block, the output of which is connected to the installation inputs of the pulse generator, from the third memory block and a counter, the auxiliary input of which is connected to the auxiliary input of the third memory block and the first output of the pulse generator, the second output of which is connected to the control input of the third reference block, the output of which o connected to the stop input of the pulse generator.

Sources of information 5 taken into account in the examination

1. USSR author's certificate No. 319089, class, H 04 L 1/00, 1970.

Claims (1)

Claim A device for simulating a binary communication channel, containing a random number sensor, the outputs of which are connected to the inputs of the first and second comparison blocks, the additional inputs of which are connected to the outputs of the first and second memory blocks, the corresponding inputs of which are interconnected, the output of the first comparison unit being connected5 nen with the first trigger input, the second input of which is connected to the first output of the binary signal source, the second output of which is connected to the input of the synchronization block, the outputs of which are connected are coupled with the synchronizing inputs of the random number sensor, the first and second comparison blocks and the first and second memory blocks, while the trigger output is connected to the receiver input, characterized in that, in order to increase the simulation accuracy, a third comparison block, a third memory block, a pulse generator and a counter whose outputs are connected to the inputs of the third memory unit, the outputs of which are connected to the inputs of the first and second memory units and to the inputs of the third comparison unit, the additional inputs of which are connected to the inputs of the second comparison unit, the output of which is connected to the installation inputs of the pulse generator, the third memory unit and counter, the additional input of which is connected to the additional input of the third memory unit and the first output of the pulse generator, the second output of which is connected to the control input of the third comparison unit, the output of which is connected to stop input of the pulse generator.