Zero crossing algorithm based phase recovery for DPLL based wireless communication

Recent trends in the field of wireless communication have seen emphasis being given on very high quality reception of signals with minimum error rates. Unlike traditional communication links, which focused on accuracy of received digital intelligence in terms of incorporating efficient coding and decoding techniques, now-a-days, prime importance is given to achieving an accurate estimate of the transmitted passband signal in terms of frequency and phase indirectly leading to good quality bit stream reception. Digital Phase Locked Loops(DPLLs), can optimally perform the above task to regenerate the passband waveform. Zero Crossing (ZC) algorithms are often used to implement DPLLs as they provide a very accurate estimate of parameters such as frequency, phase etc. In this context, our work also focuses on implementing a ZC DPLL based phase recovery system which works optimally with the QPSK modulated signals under faded and noisy channel conditions.