Bridging the Gap Between Kalman Filter and Wiener Filter in Carrier Phase Tracking
- 23 April 2013
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Photonics Technology Letters
- Vol. 25 (11) , 1035-1038
Abstract
Data-aided carrier recovery based on phase-lock loop (PLL) is a popular scheme for tracking the phase of an incoming carrier affected by phase noise. Optimum tracking is achieved by a Kalman filter, that, with multilevel quadrature amplitude modulation (QAM), is implemented by a PLL with variable loop gain. This letter shows that a PLL with fixed gain achieves a performance that is close to the optimal one provided that the phase detector is optimized. Monte Carlo simulations for the mean-square phase error and the symbol error rate of a 256-QAM constellation are provided to validate the analysis.Keywords
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