Title :
Improved concurrent constant modulus algorithm and soft decision directed algorithm based on fractionally spaced equalization
Author :
Lu, Zhensu ; Han, Mingqiu ; Zhang, Tongfeng ; Du, Juan ; Huang, Shi
Author_Institution :
SChool of Inf. Sci. & Eng., Lanzhou Univ., China
Abstract :
In digital communications, the constant modulus algorithm (CMA) for blind channel equalization has some disadvantages such as slow convergence speed and phase rotation. Therefore, an improved CMA+SDD (soft decision directed) algorithm based on FSE is proposed. The algorithm minimizes a modified error function and the learning-rate is modulated by the received sequences. The improved CMA+SDD blind equalizer is shown to have faster convergence speed, biggish improved steady-state equalization performance, and no phase rotation compared with the existing CMA blind equalizer.
Keywords :
blind equalisers; digital communication; telecommunication channels; blind channel equalization; concurrent constant modulus algorithm; digital communications; fractionally spaced equalization; learning-rate; modified error function; soft decision directed algorithm; Baseband; Blind equalizers; Computational complexity; Convergence; Decision feedback equalizers; Digital communication; Filters; Information science; Signal design; Steady-state;
Conference_Titel :
Wireless Communications, Networking and Mobile Computing, 2005. Proceedings. 2005 International Conference on
Print_ISBN :
0-7803-9335-X
DOI :
10.1109/WCNM.2005.1544120