Apparatus and method of achieving improved diversity reception i

Details Apparatus and method of achieving improved diversity reception i Apparatus and method of achieving improved diversity reception i

1997-04-09

2000-06-13

Chin, Stephen

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

375214, 375232, 375346, 375347, H04B 702

Patent

active

060758236

ABSTRACT:
A pilot signal is generated and added to a modulated carrier in a transmitter. The pilot signal is identical to an unmodulated carrier and has a level higher than a modulated signal to be transmitted. The pilot signal, transmitted together with the modulated carrier, is extracted at a diversity receiver and is correlated with the transmitted signals appearing at a plurality of diversity paths in the receiver in order to generate respective correlation coefficients. Subsequently, the received signals are respectively compensated for, using the correlation coefficients, in terms of levels and phases and then applied to a combiner. The pilot signal included in the output of the combiner is removed before the output of the maximum-ratio combiner is demodulated.

REFERENCES:
patent: 4701935 (1987-10-01), Namiki
patent: 5119401 (1992-06-01), Tsujimoto
patent: 5140615 (1992-08-01), Jasper et al.
patent: 5361404 (1994-11-01), Dent
patent: 5524023 (1996-06-01), Tsujimoto
patent: 5524125 (1996-06-01), Tsujimoto
Tsujimoto, Ichiro "Cancellation of CW Interference by Decision Feedback Equalizer in Multipath Channel", Japanese Association of Electronics and Information, Spring Session, p. 2-418, 1992.
Tomiuk et al., "The Effect of Channel Weighting Errors in Maximal Ratio Combiners", Proceedings of the 29th Annual Conf. on Information Sciences and Systems, (1995).

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