Adaptive carrier recovery using dual-loop DPLL for mobile communication applications

A new salient digital recovery technique using an adaptive dual-loop digital phase-locked loop (DPLL) for mobile communication applications is presented. The dual-loop DPLL has several important characteristics, i.e., robust stability and bandwidth control, zero static phase offset, and unlimited capture range. By adjusting its control parameters adaptively according to input noise and phase fluctuations, the dual-loop DPLL recovers the carrier of the incoming signal under fadings and additive white Gaussian noise (AWGN) in a mobile communication channel. This technique requires only moderate computational complexity and memory space, but it still tracks phase fluctuation effectively and reduces the input jitter within allowable jitter tolerance. Since it achieves fast initial acquisition of frequency and phase without a limitation of pull-in range, it enables fast carrier switching