Method of subspace beamforming using adaptive transmitting anten

Details Method of subspace beamforming using adaptive transmitting anten Method of subspace beamforming using adaptive transmitting anten

1995-04-17

1997-05-27

Urban, Edward F.

Telecommunications

Transmitter and receiver at separate stations

Distortion, noise, or other interference prevention,...

455 62, 455 673, 455103, H04B 1500

Patent

active

056341997

ABSTRACT:
A method is disclosed for using feedback to reduce crosstalk between mobile receivers in a wireless communications system comprising an adaptive transmitting antenna array. Feedback signals from the receivers are time-averaged and used to calculate a set of weight vectors that minimize crosstalk and maximize desired signal without requiring burdensome feedback rates. Beamforming diversity is combined with feedback through the use of diversity vectors. The preferred embodiment includes a method for obtaining the required feedback by exploiting the SAT circuitry present in the AMPS system currently in use. Consequently, the method may be implemented without modification to existing cellular phone handsets.

REFERENCES:
patent: 4495648 (1985-01-01), Giger
patent: 4811421 (1989-03-01), Havel et al.
patent: 5471647 (1995-11-01), Gerlach et al.
G. Raleigh et al., "A Blind Adaptive Transmit Antenna Algorithm for Wireless Communication," International Communications Conference, 1995.
Derek Gerlach et al., "Spectrum Reuse Using Transmitting Antenna Arrays with Feedback," Proc. ICASSP, 1994, pp. 97-100.
Derek Gerlach et al., "Adaptive Transmitting Antenna Arrays With Feedback," IEEE Signal Processing Letters, vol. 1, Oct., 1994, pp. 150-152.
Derek Gerlach et al., "Adaptive Transmitting Antenna Arrays With Feedback," IEEE Transactions on Vehicular Technology, Submitted Oct. 1994.
Derek Gerlach et al., "Adaptive Transmitting Antenna Methods for Multipath Environments," Presented at the 1994 GlobeCom Conference.

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