Digital carrier recovery with adaptive dual loop DPLL for mobile communication applications

The dual-loop digital phase-locked loop (DPLL) adjusts its control parameters adaptively according to input noise and phase fluctuations based on the recursive least square criterion. 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. Also, since it achieves fast initial acquisition of frequency and phase without a limitation of pull-in range, it makes fast carrier switching possible. The dual loop DPLL allows robust stability and bandwidth control and achieves zero static phase offset for step input frequency changes.<>