Channel estimation algorithms for third generation W-CDMA communication systems

Three approaches for channel estimation are proposed and analyzed for third generation (3G) wideband code division multiple access (W-CDMA) communication systems. The down link (DL) channel estimation schemes researched use time multiplexed pilot-data symbols, code multiplexed common pilot channel (CPICH), and combine the channel estimate results from these two into an approach which is called combined channel estimation (CCE). For channel estimates using time multiplexed pilot-data symbols, we propose a new algorithm called iterative multi-slot averaged linear interpolation (IMALI). These methods are modeled and analyzed by means of computer simulations under a multipath Rayleigh fading channel and compared to the ideal channel estimation result. IMALI and CCE schemes show improvement in channel estimation accuracy and BER performance for high Doppler frequency.