Semi-blind Channel Estimation at the Receiver for Steered-STS Transmit Antenna Architecture in CDMA2000

We address the problem of pilot and data channels mismatch in a SSTS (steered space time spreading) system by means of advanced signal processing at the mobile receiver. The main idea is to apply Lucent's antenna array architecture and transmission algorithm and involve both the pilot and traffic signals in channel estimation at the receiver. Two semi-blind 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 the main imperfections such as estimation error for the correlation coefficient at the reverse link, calibration error, different pilot powers for diversity antennas, etc. It is demonstrated that the semi-blind algorithms outperform the conventional receiver in the low- and medium-speed area.