PLL performance of asynchronous multirate CDMA system by DPC

The phase synchronization performance of a digital phase-locked loop (PLL) is investigated in wideband asynchronous multirate CDMA system. Dynamic partial correlation (DPC) is proposed to evaluate the autocorrelation of multirate cross-correlation terms and the corresponding power spectral density (PSD) in the presence of multirate multiple access interference (MMAI) and additive white gaussian noise (AWGN). The steady-state probability density function (PDF) and variance of the phase estimator error is performed by solving the first-order Fokker-Planck equation.