RAO Wei. Blind Equalization Using Coordinate Mapping for 4-PAM and 16-QAM Signals[J]. Chinese Journal of Electronics, 2014, 23(1): 124-128.
Citation: RAO Wei. Blind Equalization Using Coordinate Mapping for 4-PAM and 16-QAM Signals[J]. Chinese Journal of Electronics, 2014, 23(1): 124-128.

Blind Equalization Using Coordinate Mapping for 4-PAM and 16-QAM Signals

Funds:  This work is supported by the National Natural Science Foundation of China (No.61102022) and the Natural Science Foundation of Jiangxi Educational Committee of China (No.GJJ12632).
  • Received Date: 2012-12-01
  • Rev Recd Date: 2013-04-01
  • Publish Date: 2014-01-05
  • It is well known that the famous Constant modulus algorithm (CMA) presents a large steady-state Mean square error (MSE) for nonconstant modulus signals. In this paper a coordinate mapping approach for a 4-PAM nonconstant modulus signal is described which can change the signal to an Offset QPSK (OQPSK) constant modulus signal. And a new algorithm based on this approach is proposed which is also suitable for a 16-QAM signal. For the 4-PAM and 16-QAM nonconstant modulus signals the proposed algorithm can achieve a zero steadystate MSE in a noiseless environment but CMA cannot. Theoretical analysis and simulations results demonstrate the high performance of the proposed algorithm.
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