In this paper, an improved channel esti-mation algorithm based on tracking the level crossing rate (LCR) for fading rate is proposed in the CDMA systems with the continuous pilot channel. By using a simple LCRestimator, the Doppler-shift can be calculated approxi-mately, thus the observation length of the channel estima-tion can be adjusted dynamically. The procedure is pre-sented which includes the iterative algorithm for the time varying channel. Moreover, computer simulation results show that the algorithm achieves good tradeoff between the noise compression capability and the channel tracking performance.
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