Adaptive Optimization of Least Squares Tracking Algorithms: With Applications to Adaptive Antenna Arrays for Randomly Time-Varying Mobile Communications Systems
NORTH CAROLINA STATE UNIV AT RALEIGH DEPT OF MATHEMATICS
Pagination or Media Count:
Adaptive antenna arrays are widely used for reducing the effects of interference and increasing capacity in mobile communications systems. The adaptation typically consists of updating the antenna weights by a recursive least-squares-type algorithm. We will add another adaptive loop that greatly improves the operation when the environment for the various links is randomly time-varying. The analysis is via stochastic approximation type arguments. Consider a single cell system with an receiving antenna array at the base station. Algorithms for tracking time varying parameters require a balance between the need to follow changes implying a short memory and the need to average the effects of disturbance implying a long memory.
- Statistics and Probability