Geometric-based stochastic channel modeling for adaptive antennas with oscillating beam patterns

Applying proper time-varying phases (delays) to the array elements of an adaptive antenna, its beam pattern is carefully controlled to generate an oscillating beam pattern. This creates a time varying channel with a controllable coherence time. With an adaptive antenna at the base station (BS), the controllable coherence time is used by the mobile station (MS) to exploit time diversity and enhance performance. In this work, using an oscillating beam pattern antenna array in the BS, the channel is properly modeled to evaluate the coherence time in the MS. A so-called geometric-based stochastic channel modeling (GSCM) scheme is presented, which allows us to model this new time-varying channel and to investigate the coherence time. We demonstrate the relationship between coherence time and the antenna array control parameters