Title :
Tracking performance of a stochastic gradient algorithm for transmit antenna weight adaptation with feedback
Author :
Banister, Bnan C. ; Zeidler, James R.
Author_Institution :
Dept. of Electr. & Comput. Eng., California Univ., San Diego, La Jolla, CA, USA
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
Keywords :
Rayleigh channels; adaptive antenna arrays; array signal processing; autoregressive processes; cellular radio; feedback; gradient methods; radio tracking; stochastic processes; transmitting antennas; AR1 vector fading channel; BER; cellular radio systems; first order autoregressive Rayleigh fading; gradient sign feedback; normalized perturbed transmission weights; performance measure; receiver; stochastic gradient algorithm; tracking performance; transmit antenna weight adaptation; transmit antenna weight adaptation algorithm; Adaptive arrays; Antenna feeds; Antenna measurements; Downlink; Fading; Feedback; Performance analysis; Receiving antennas; Stochastic processes; Transmitting antennas;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 2001. Proceedings. (ICASSP '01). 2001 IEEE International Conference on
Conference_Location :
Salt Lake City, UT
Print_ISBN :
0-7803-7041-4
DOI :
10.1109/ICASSP.2001.940271
