Pilot-assisted Adaptive Channel Estimation Using Multiple Sets of Tap Weights for Coherent Rake Reception of Ds-cdma Signals

For the coherent reception of DS-CDMA signals, this paper proposes a new adaptive channel estimation scheme using multiple sets of adaptive filter tap weights, each set being used for channel estimation at different symbol position. For updating each set of tap weights using the normalized least mean square (NLMS) algorithm, a block of known pilot symbols is time-multiplexed with the data modulated symbols. The average bit error rate (BER) performance in a frequency-selective Rayleigh fading channel is evaluated by computer simulation. It is confirmed that the proposed channel estimation scheme provides better BER performance than the conventional channel estimation schemes.