Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Patent
1995-04-07
1996-11-26
Bocure, Tesfaldet
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
375347, 375332, 455137, 329304, H04L 2706, H04L 2722, H04L 102
Patent
active
055793436
ABSTRACT:
An object of the present invention is to provide a soft decision circuit by which the reception accuracy can be improved. Each of first and second receivers of the soft decision circuit includes a phase amount detector for detecting a phase amount of a receive signal, an I table and a Q table for converting the phase amount into orthogonal I/Q signals, an A/D converter for converting a receive level signal of the receive signal into a digital value, a log linear table for converting an output of the A/D converter into a squared value of a true value, and first and second multipliers for multiplying outputs of the I table and the Q table with the output of the log linear table to weight the outputs of the I table and the Q table. The soft decision circuit further comprises first and second adders for adding outputs of the first and second multipliers of the receivers of the 0-system and the 1-system, respectively, and a digital signal processing circuit for performing determination using outputs of the adders as soft decision information.
REFERENCES:
patent: 5109392 (1992-04-01), McDonald
patent: 5127025 (1992-06-01), Okanoue
patent: 5203023 (1993-04-01), Saito et al.
patent: 5265122 (1993-11-01), Rasky et al.
"Digitization Technique for Mobile Communication", Triceps, 1990, p. 158.
Bocure Tesfaldet
NEC Corporation
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