Adaptive digital beamforming receiver with .pi./2 phase shift to

Details Adaptive digital beamforming receiver with .pi./2 phase shift to Adaptive digital beamforming receiver with .pi./2 phase shift to

1999-10-21

2000-09-05

Ghebretinsae, Temesghen

Pulse or digital communications

Equalizers

Automatic

375347, 348725, H04B 1018, H03H 730

Patent

active

061154199

ABSTRACT:
There is disclosed an apparatus and method for improving signal reception in a signal receiver. The apparatus comprises a beamforming circuit and a decision feedback equalizer circuit. The beamforming circuit comprises two circuit branches with each circuit branch having a radio frequency (RF) tuner capable of being coupled to an antenna, an intermediate frequency (IF) mixer, a .pi./2 phase shift circuit, and two feedforward equalizer circuits and an adder circuit. In the decision feedback equalizer circuit a decision device that is coupled to the output of said adder circuit modifies equalizer coefficients in said feedforward equalizer circuits to reduce an interfering signal by electronically forming a null in the direction of the interfering signal.

REFERENCES:
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patent: 5844951 (1998-12-01), Proakis et al.
patent: 5884192 (1999-03-01), Karlsson et al.
"Directionally Constrained Adaptive Beamforming to Enhance Interference Nulling in Direct-Sequence Spread-Spectrum Communication Systems", by Mark A. Jones et al., pp. 106-110, Milcom '93, vol. 1.

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