Enhancing Synchronized Cellular Forward Links by Exploiting Spatial-Temporal Signatures using Extended Subspace Approach

Pilot signals are often used to ease mobile channel acquisition and detection. Cochannel signals are usually treated as interference. However, for synchronized cellular CDMA forward links, all cochannel signals from the same base station share a spatial and temporal channel signature. We propose an extended blind subspace approach to exploit this feature to enhance channel estimation. We demonstrate the performance gain by simulating two transmission schemes for MIMO cellular base stations: fixed beam and adaptive beam.