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A new subcarrier combining technique is proposed for MC -CDMA receiver inmobile Rayleigh fading channel. It exploits the structure formed by repeatingspreading sequences of users on different subcarriers to simultaneouslysuppress multiple access interference (MAI) and provide implicit channeltracking without any knowledge of the channel amplitudes or training sequences.This is achieved by adaptively weighting each subcarrier in each symbol periodby employing a simple gradient descent algorithm to meet the constant modulus(CM) criterion with judicious selection of step-size. Improved BER and usercapacity performance are shown with similar complexity in order of O(N)compared with conventional maximum ratio combining and equal gain combiningtechniques even under high channel Doppler rates.

Blind Adaptive Subcarrier Combining Technique for MC-CDMA Receiver in Mobile Rayleigh Channel