Improving the performance of the error function for fast phase recovery of QAM signals in CMA blind equalizers using variable step

Sathyanarayan S. Rao; Priyadarshini Muddepal; Sudarshan Rao Nelatury II

doi:10.1117/12.560637

26 October 2004 Improving the performance of the error function for fast phase recovery of QAM signals in CMA blind equalizers using variable step

Sathyanarayan S. Rao, Priyadarshini Muddepal, Sudarshan Rao Nelatury II

Author Affiliations +

Proceedings Volume 5559, Advanced Signal Processing Algorithms, Architectures, and Implementations XIV; (2004) https://doi.org/10.1117/12.560637
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

A new constant modulus algorithm (CMA) type of error function for fast phase recovery of QAM signals was recently proposed in which the cost function of the error function recovers the phase simultaneously with the equalization. In this paper we propose variable step (VS) in the update equations of new error function to enhance the performance of convergence speed and residual inter-symbol interference (ISI). Effectiveness of the error function for well-behaved channel, under-modeled channel and channel disparity are presented. Simulation results are presented to compare the performance of VS, constant step (CS) and the modified CMA (MCMA) using 16-QAM signal constellation.

Citation Download Citation

Sathyanarayan S. Rao, Priyadarshini Muddepal, and Sudarshan Rao Nelatury II "Improving the performance of the error function for fast phase recovery of QAM signals in CMA blind equalizers using variable step", Proc. SPIE 5559, Advanced Signal Processing Algorithms, Architectures, and Implementations XIV, (26 October 2004); https://doi.org/10.1117/12.560637

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