Radio receiver

Details Radio receiver Radio receiver

1997-02-04

1999-05-18

Chin, Stephen

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

375324, 375371, H04L27/06;27/22;7/00

Patent

active

059057645

ABSTRACT:
A radio receiver for a digital cellular system or the like corrects a doppler frequency shift with a simple arrangement. A phase difference of received data I,Q is corrected by generating an estimated signal EXn through estimation of the received data I,Q corresponding to transmitted data y estimated for the maximum likelihood by a maximum likelihood determination circuit 25, by detecting the branch metric BM, BM+, or BM- in which the estimated data is in phase with the received signal, or in the leading or trailing phase to the received signal, respectively, by detecting the phase difference of the received data I,Q from the estimated signal EXn based on the result of comparison of the branch metrics BM+, BM, and BM-, and by correcting the phase difference based on the result of detection of the phase difference.

REFERENCES:
patent: 4578800 (1986-03-01), Yasuda et al.
patent: 5710792 (1998-01-01), Fukawa et al.
patent: 5724394 (1998-03-01), Ikeda et al.
patent: 5729558 (1998-03-01), Mobin
Patent Abstracts of Japan vol. 018, No. 675 (E-1648), Dec. 20, 1994 of JP 06 268540 A (Fujitsu Ltd), Sep. 22, 1994.

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