Constant Modulus Equalization Algorithm for Higher-order General Constellations
Yang Da-long①② Chen Da-hai② Zhang Jian② Chen Zhi-qiang①
①(Department of Engineering Physics Tsinghua University, Beijing 100084, China) ②(Institute of Electronic Engineering, China Academy of Engineering Physics, Mianyang 621900, China)
Abstract：High data rate communication over limited bandwidth or multi-path channels suffers severe distortion due to the Inter-Symbol Interference (ISI). Constant Modulus blind equalization Algorithms (CMA) are widely used for mitigating this phenomenon. But for higher-order no constant amplitude modulations, CMA works less effective for its large residual error. A simple modified error function which is suitable for variable constellation is proposed for better convergence performance. The new algorithm is well verified by theoretic analysis and numerical simulations, and the theoretic analysis and simulations show that the new algorithm’s residual error is much less than the origin algorithms’ in MQAM and MAPSK modulation systems and the new algorithm is suitable for applications under these conditions.
2012, Vol. 34 
