Tracking performance of a stochastic gradient algorithm for transmit antenna weight adaptation with feedback

Authors:
B. C. Banister;J. R. Zeidler
Affiliations:
Dept. of Electr. & Comput. Eng., California Univ., San Diego, La Jolla, CA, USA;-
Venue:
ICASSP '01 Proceedings of the Acoustics, Speech, and Signal Processing, 2001. on IEEE International Conference - Volume 05
Year:
2001

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Abstract

The tracking performance of a transmit antenna weight adaptation algorithm applied in a fading channel is considered. The system uses a stochastic gradient algorithm incorporating gradient sign feedback from a receiving unit to adjust the transmit weights. The feedback is simply a bit indicating which of two normalized perturbed transmission weights delivers greater power to the receiver. A reasonable performance measure is defined and an analytic estimate of the performance in an AR1 vector fading channel is derived and compared to simulations.