System and method for calculating a state transition metric in a

Details System and method for calculating a state transition metric in a System and method for calculating a state transition metric in a

1996-02-13

2000-08-29

Pham, Chi H.

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

375262, 371 438, H03D 100, H04L 2706

Patent

active

061119237

ABSTRACT:
A system and method for calculating survivor metrics in a Viterbi equalizer of a receiver, such as a receiver operative to receive a PSK-modulated signal, for example, a .pi./4, differential, phase-shift-keying, modulated signal. The state transition metric, defined as a function of two successive states, is converted into a function defined by pairwise differences between allowable symbols of a PSK-modulated signal. When operative to receive the .pi./4 DQPSK-modulated signal, the number of calculations required to calculate state transition metrics is reduced significantly.

REFERENCES:
patent: 4484338 (1984-11-01), Clark et al.
patent: 4545054 (1985-10-01), Davis
patent: 4606027 (1986-08-01), Otano
patent: 4631737 (1986-12-01), Qureshi
patent: 4885757 (1989-12-01), Provence
patent: 4995104 (1991-02-01), Gitlin
patent: 5029186 (1991-07-01), Maseng et al.
patent: 5063573 (1991-11-01), Langewellpott
patent: 5124551 (1992-06-01), Borth et al.
patent: 5204874 (1993-04-01), Falconer et al.
In Re Hiroyuki Iwashashi, Yoshiki Nishioka and Mitsuhiro Hakaridani, 888 F. 2d 1370, 12 U.S.P.Q. 2D (BNA) 1908, (Court of Appeals for Federal Circuit 1989).
G. David Forney, Jr., "The Viterbi Algorithm", Proceedings of the IEEE, vol. 61, No. 3, Mar. 1973, pp 268-278.
Gottfried Ungerboeck, "Adaptive Maximum-Likelihood Receiver for Carrier-Modulated Data-Transmission Systems", IEEE Transactions on Communications, vol. COM-22 No. 5, May 1974, pp 624-636.

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