Soft decision digital communication apparatus

Details Soft decision digital communication apparatus Soft decision digital communication apparatus

1987-01-02

1988-05-03

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

371 43, 375 96, H03K 904

Patent

active

047425334

ABSTRACT:
An apparatus for performing a soft decision function prior to convolutional decoding in a data communication system using differential quadrature-PSK or other transmission schemes is disclosed. A memory element coupled between a demodulator and the convolutional decoder in a receiver portion of the communications system performs the soft decision function. The memory element contains data organized using probability of occurrence and Log-Likelihood parameters for each potential combination of current and past received signal modulation quantized at a predetermined level.

REFERENCES:
patent: 4099121 (1978-07-01), Fang
patent: 4242641 (1980-12-01), Houdard
patent: 4320499 (1982-03-01), Muilwijk et al.
patent: 4586182 (1986-04-01), Gallagher
patent: 4691318 (1987-09-01), Entenman

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