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

Research output: Contribution to journalConference article


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.

Original languageEnglish (US)
Article number37
Pages (from-to)307-312
Number of pages6
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - Dec 1 2004
EventAdvanced Signal Processing Algorithms, Architectures, and Implementations XIV - Denver, CO, United States
Duration: Aug 4 2004Aug 6 2004


All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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