Strategic Study of CAE >> 2007, Volume 9, Issue 2
DE-CMA:An Improved Blind Equalization Algorithm Used in3G Connection Systems
Information Security Research Center, Southeast University, Nanjing 21 0096, China
Next Previous
Abstract
The convergence of the Constant-modulus algorithm widely used in DVB system is a complex problem.Firstly,some influencing factors such as cost function,iterative equation and filter coefficients are considered;then,in this paper,an ameliorative algorithm with time-delay estimate is proposed,which can avoid converging to the ill solution by correcting the position of main path.Simulation results demonstrate the proposed algorithm can highly improve the convergence performance of the primary one.Besides,its simplicity and efficiency make it feasible in the high-rate 3G connection application.
Keywords
blind equalization ; CMA ; ill-convergence ; time-delay-estimate
References
[ 1 ] Godard D N . Self-recovering equalization and carrier tracking in two-dimensional data communication systems [J] .IEEE Trans Commun , COM - 28 , 1980 , 28(11) : 1867 ~ 1875 link1
[ 2 ] Zhi Ding . Ill-convergence of godard blind equalizers in data communication systems [J] . IEEE Trans Commun , 1991 ,39(9) :1313 ~ 1327 link1
[ 3 ] 陈如明 .大容量数字微波传输系统工程[M] .北京 : 人民邮电出版社 ,1998
[ 4 ] Roy P . Fractional Spaced Blind Equalizer Performance Improvement [D] .Tan ,2000
[ 5 ] 王 正 ,李 铭 ,王 匡 ,等 .DVB-C 中盲均衡算法 的收敛性[J] .数字电视与数字视频 ,2003 ,(11) :24 ~ 26
[ 6 ] Johnson R C . Admissibility in blind adaptive channel equalization [J] . IEEE Control Systems , 1991 , (Jan) : 1672 ~ 1708 link1
[ 7 ] Picchi G ,Prati G .Blind equalization and carrier recovery using a ‘stop-and-go’ decision-directed algorithm [J] . IEEE Trans Commun ,1987 ,35(Sep) :877 ~ 887 link1
[ 8 ] Ye Li .Convergence analysis of finite length blind adaptive equalizers [J] . IEEE Trans Commun , 1995 , 39 (9) : 1995 ,2120 ~ 2129 link1