SU544138A1 - Device for static detection of discrete signals in communication channels with intersymbol interference - Google Patents

Description

subtractive input of the adder, to the summing input of which the output of the receiver of continuous signals is connected through a delay element

The drawing is a structural electrical circuit of the proposed device.

A device for statistical detection of discrete signals in communication channels with intersymbol interference contains a receiver 1 of continuous signals and a serially connected adder 2 and decisive block 3, a regenerator of 4 m -ary signals, where p-1 is the base of the number system, shaper 5 of a hypothetical sequence, block 6 adders modulo m, generator 7 suspected errors, multiplier 8 for the coefficients of noise stresses, summing block 9 and delay element 10, with an additional output of receiver 1 through Regularly connected regenerator 4 and shaper 5 are connected to one group of inputs of block 6, to another group of inputs of which generator outputs 7 are clamped, and outputs of block 6 through sequentially connected connectors 8 and summing block 9 are connected to the subtracting input of adder 2, to the summing input of which is connected to the output of the receiver 1 through the delay element 10,

The device works as follows

G1RSh-1 oscillations from additional: the output output of receiver 1 is fed to the input of the regenerator 4 tons of physical signals, the output of which is written to the imaging unit 5 of a hypothetical sequence with the speed of a subunit V, equal to the memory channel, with shaper outputs

Signals are sent to one group of inputs of block 6, the other group of inputs of which receive signals from generator 7 at a speed of VXL, which during the reception of one character provides the output of the block

6 formation of sets of symbol combinations taking into account the expected errors in the channel memory interval. Predefined Signals

for a stationary communication channel and updated when using a non-stationary communication channel, from the outputs of block 6 are fed to the inputs of the multiplier 8. The result is the mind} 10 of the interfering noise residues from the previous and subsequent symbols to the output of the multiplier 8 is fed to the subtracting input adder

2, the summing input of which receives a continuous signal from the prelichk 1 through the delay element 10 on the OD1Sh symbol. The signal from the output of the adder 2 is analyzed in the flashing unit 3 at the memory interval L, and then the decision on the transmitted symbol is made.

Thus, a device for static detection of discrete signals in communication channels with intersymbol Ilferfendia, which assumes a certain type and nature of error on the memory length of channel L, allows for a small amount of computation, which leads to a reduction in the time for detection of discrete signals.

Claims (2)

1.Patent of the USA number 3750026, cl. H 04 B 1/16 published 1973. 2. Patent of the USA No. 3815028, cl. H 04 B 1/12 publ. 1974 (prototype).