Method for minimizing cross-talk in adaptive transmission antenn

Details Method for minimizing cross-talk in adaptive transmission antenn Method for minimizing cross-talk in adaptive transmission antenn

1993-04-14

1995-11-28

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

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

455 673, 455 69, 455103, H04B 110

Patent

active

054716470

ABSTRACT:
A method is disclosed for using feedback signals (32) to optimize the directional properties of information signals (19) with respect to their intended receivers (16), where information signals (19) are applied to the transmitting elements (14) of a transmitting antenna array (12). Feedback signals (32) generated at receivers (16) by probing signals (17) are monitored, and the weight matrix with which signals (17) are distributed among array elements (14) is adjusted according to feedback signals (32) to minimize cross-talk. Information signals (18) transmitted according to an optimized weight matrix will also have reduced cross-talk. A weight matrix may be optimized by perturbing an initial weight matrix, calculating an error function from the feedback signals (32) produced by each perturbed weight matrix, estimating the direction of an extremum from the error functions, and adjusting the initial weight matrix in that direction. Alternatively, a gain matrix for the transmitting array may be explicitly determined by sequentially exciting each transmitting element (14) and measuring the resultant feedback signals (32). These are then used to calculate the weight matrix that eliminates cross-talk.

REFERENCES:
patent: 4495648 (1985-01-01), Giger
patent: 4811421 (1989-03-01), Havel et al.
"A Comparison of Adaptive Algorithms Based on the Methods of Steepest Descent and Random Search", by Bernard Widrow, Fellow, IEEE, & John M. McCool, Senior Member, IEEE; IEEE Transactions on Antennas and Propagation, vol. AP-24, No. 5, Sep. 1976, pp. 615-637.

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