摘要
常数模算法(constant modulus algorithm,CMA)能够很好地克服无线信道引入的符号间干扰(ISI),在信道均衡中广泛应用,但存在稳态误差大,相位旋转的问题;MMA算法解决了CMA算法的相位旋转问题,但仍然有较大的稳态误差。为了克服以上缺点,在研究各种算法的基础上,引入非线性函数来构造步长调整参数,计算机仿真结果表明,相比传统算法,变步长盲均衡算法有较快的收敛速度和更好的均衡效果。
Constant modulus algorithm（CMA）,which is widely used in the channel equalization,can well overcome inter-symbol interference（ISI） introduced by the radio channel.But there is steady-state error,and phase rotation of the issue;MMA algorithm can solve the problem of phase rotation in CMA algorithm,but there are still a large steady state error.To overcome these shortcomings,in this paper,a modified blind equalization algorithm with variable step-size based on the introduction of non-linear function to construct step adjustment parameters is proposed.Simulation results show that compared to the traditional algorithm,variable step-size blind equalization algorithm has faster convergence rate and more good results.
出处
《大众科技》
2012年第3期54-56,共3页
Popular Science & Technology
关键词
盲均衡
CMA
MMA
变步长
blind equalization
CMA
MMA
variable step-size
