Channel-aided, decision-directed delay-locked loop for CDMA communications

A channel-aided, decision-directed delay-locked loop (CADD-DLL) is investigated for code-division multiple-access (CDMA) communication. It is assumed that an estimate of channel multiplicative distortion (MD) is obtained at the receiver with the aid of pilot symbols. The performance of the proposed tracking loop is assessed in terms of the variance of PN code tracking error and the mean-time-to-loss (MTTL) for a frequency-selective Rayleigh fading channel in the presence of user-induced interference and lognormal shadowing.