Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1990-05-02
1992-06-30
Safourek, Benedict V.
Pulse or digital communications
Spread spectrum
Direct sequence
455135, H04B 708
Patent
active
051270250
ABSTRACT:
In a space diversity receiver, multiple signal paths are connected respectively to antennas for multipath reception. Each signal path includes a digital demodulator coupled to the antenna and an impulse response detector, or autocorrelator connected to the demodulator for deriving a channel impulse response of each one of the multiple paths. A maximum response detector is connected to each impulse response detector for detecting equalizable delay components which give a maximum response value and a unequalizable delay components. A power ratio of the unequalizable delay components to the equalizable delay components is derived for each signal path and a minimum value of the power ratios is determined and one of the signal paths in which the mininmum value is detected is selected. The output signal of the demodulator of the selected signal path is applied to one input of an equalizer, or a maximum likelihood sequence estimator, and the equalizable delay components of the selected signal path are applied to the other input of the equalizer.
REFERENCES:
patent: 4513412 (1985-04-01), Cox
patent: 4733402 (1988-03-01), Monsen
patent: 4884272 (1989-11-01), McConnell
Peter Monsen, "Adaptive Equalization of Slow Fading Channel", IEEE Transactions on Communications, vol. COM-22, No. 8, Aug. 1974.
NEC Corporation
Safourek Benedict V.
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