Diversity receiver using matched filter and decision feedback eq

Details Diversity receiver using matched filter and decision feedback eq Diversity receiver using matched filter and decision feedback eq

1991-05-30

1994-08-02

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

Single message via plural carrier wave transmission

455 65, 455136, 455138, 455140, 375100, H04B 1702

Patent

active

053353595

ABSTRACT:
In a digital radio communications system, a transmit signal is delayed and sent on a first diversity channel and a nondelayed version of the signal sent on a second diversity channel. At the receiving site, first and second diversity channel signals are recovered and normalized into first and second constant-amplitude signals. Predominant components of the constant-amplitude signals are phase-and-amplitude aligned with each other by feedback loops including phase-and-amplitude alignment circuits, an adder and an AGC amplifier. The output of the AGC amplifier or the output of the subtracter is selected and applied to a matched filter to which a decision feedback equalizer is coupled. In a modified embodiment, the transmit signal from a single source is transmitted over multipath fading channels, resulting in the reception of first and second diversity channel signals which are normalized to constant-amplitude signals whose predominant components are then phase-and-amplitude aligned with each other through feedback loops including an AGC amplifier. Correlations between the predominant components in the first diversity channels and the output of the AGC amplifier are detected and multiplied with the output of the AGC amplifier, combined in respective subtracters with the diversity channel signals for coupling to respective matched filters whose outputs are diversity-combined together for coupling to a decision feedback equalizer. In a further modification, the output of the AGC amplifier is combined with the phase-and-amplitude aligned signals by the subtracters for coupling to the matched filters.

REFERENCES:
patent: 3195048 (1965-07-01), Adams et al.
patent: 3835392 (1974-09-01), Mahner et al.
patent: 4849990 (1989-07-01), Ikegami et al.
patent: 5127025 (1992-06-01), Okanoue
Watanabe, "Adaptive Matched Filter and its Significance to Anti-Multipath Fading", IEEE, CH2314-3/86/0000-1455, 1986, pp. 1455-1459.

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