Branch metric module in viterbi decoder

Details Branch metric module in viterbi decoder Branch metric module in viterbi decoder

1995-12-19

1998-03-10

Chin, Stephen

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

375262, H03D 100, H04L 2706

Patent

active

057270295

ABSTRACT:
The present invention relates in general to a channel CODEC to increase the transmitting effect on a communication channel of a communication system, and more specifically to a branch metric module of a viterbi decoder. The module includes an operator for operating and outputting the differential magnitude of two signals, one signal being a code word generated to perform the viterbi decode and the other being a signal transmitted through the channel. An adder sums and outputs the data which is outputted to it from the operator. A receiving code word converter converts the magnitude of any of bits by the linear sampling quantization process, and non-linearly converts it in accordance with a preestimated or predetermined format. A number of operators calculate the magnitude between two signals at the absolute value to convert the magnitude of an inputted generative code word and the magnitude of the non-linear converted receiving code word. The adder sums and outputs the result to a branch metric converter, which converts the output according to the preestimated format.

REFERENCES:
patent: 4606027 (1986-08-01), Otani
patent: 5027374 (1991-06-01), Rossman
patent: 5295142 (1994-03-01), Hatakeyama
patent: 5432803 (1995-07-01), Liu et al.
patent: 5539757 (1996-07-01), Cox et al.
Park, et al.: "Implementation Of A Viterbi Decoder For CDMA Digital Cellular Systems", pp. 551-554; Proceedings of JTC-CSCC 1994.

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