Steered-STS Transmit Antenna Architecture With Semiblind Channel Estimation at the Receiver in CDMA2000

The problem of pilot and data channel mismatch in a steered space-time spreading (SSTS) system is addressed by means of advanced signal processing at the mobile receiver. The main idea is to apply the SSTS antenna array architecture and transmission algorithm and involve both the pilot and traffic signals in channel estimation at the receiver. Two semiblind algorithms are compared with the conventional pilot-based receiver in a CDMA2000-1X RC3 environment by means of simulations with variable speed and spatial angular spread, taking into account main imperfections such as estimation error for the correlation coefficient at the reverse link, calibration error, and different pilot powers for diversity antennas. It is demonstrated that the semiblind algorithms outperform the conventional receiver in the low- and medium-speed area