PN code tracking for exponentially weighted chip despreading sequence

This paper presents the code tracking performance on the use of weighted chip despreading PN sequence in a coherent delay locked tracking scheme for direct-sequence spread-spectrum (DS/SS) systems. In the delay locked loop (DLL), the conventional rectangular chip waveform for early and late despreading PN sequences is replaced by a weighted exponential chip waveform. The chip weight (γ) is tuned to optimise the DLL performance. The early-late spacing is considered as one chip time. This scheme is analysed for both ideal and band limited received signals in the presence of additive white Gaussian noise