Fuzzy-logic tuned constant modulus algorithm and soft decision-directed scheme for blind equalisation

被引：6
|
作者：
Chen, S. [1 ]
Luk, B. L. [2 ]
Harris, C. J. [1 ]
Hanzo, L. [1 ]
机构：
[1] Univ Southampton, Sch Elect & Comp Sci, Southampton SO17 1BJ, Hants, England
[2] City Univ Hong Kong, Dept Mfg Engn & Engn Management, Hong Kong, Hong Kong, Peoples R China
来源：
DIGITAL SIGNAL PROCESSING | 2010年 / 20卷 / 03期
关键词：
Blind equalisation; Quadrature amplitude modulation; Constant modulus algorithm; Soft decision-directed adaptation; Minimum mean square error; Adaptive step size; Fuzzy logic; STEP-SIZE;
D O I：
10.1016/j.dsp.2009.08.018
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
This contribution revisits blind equalisation for high-order quadrature amplitude modulation systems using a low-complexity high-performance concurrent constant modulus algorithm (CMA) and soft decision-directed (SDD) scheme. A fuzzy-logic (FL) tuning unit is designed to adjust the step size of the CMA, and the potential benefits of using this adaptive step size approach are investigated. Simulation results obtained confirm that faster convergence can be achieved with this FL assisted CMA and SDD scheme, compared with the previous constant step-size CMA and SDD scheme. Quantitatively, the former requires several thousands fewer samples to converge to the same steady-state solution achieved by the latter. (C) 2009 Elsevier Inc. All rights reserved.
引用
收藏
页码：846 / 859
页数：14
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