quotation:		[Copy]
		[Copy]

This Paper:Browse 4224 Download 3201
PCMA自适应自干扰对消算法与仿真
田文科,王剑,山秀明
0 Fontlarge +\|Default\|Small
(清华大学电子工程系，北京 100084)

摘要:

讨论了成对载波多址（PCMA）自适应自干扰对消原理，分析了参数估计误差对自干扰对消的影响。在频偏误差的影响下对消误差为非平稳过程，传统自适应对消滤波器无法收敛。为了克服频偏误差的影响，提出了一种自适应可变遗忘因子（VFF） RLS算法，同时，给出了具有高精度低运算量的模糊函数参数估计算法。仿真证明了VFF-RLS对消算法具有良好的对消性能和稳健性，且需要的额外功率较低，能满足PCMA系统要求。

关键词: 卫星通信成对载波多址自适应干扰对消 VFF-RLS算法

DOI：

基金项目:

Adaptive interference cancellation for paired carrier multiple access

TIAN Wen-ke,WANG Jian,SHAN Xiu-ming

(Department of Electronic Engineering, Tsinghua University,Beijing 100084,China)

Abstract:

Adaptive selfinterference cancellation for Paired Carrier Multiple Ac cess(PCMA) is investigated. The influence of parameter estimation error on sel finterference cancellation is analysed. The cancellation error is nonstatio na ry with the frequency offset error′s influence and the classical adaptive cance llation filter cannot converge to desired weight. A new Variable Forgetting Fact or(VFF) Recursive Least Square(RLS) algorithm is proposed. Meanwhile, parameter estimation algorithm wit h high accuracy and low complexity based on ambiguity function is presented. Si mulation results prove the validity of VFF-RLS cancellation algorithm for PCMA s ystem with good cancellation performance, robustness and low excess power requir ement.

Key words: satellite communication PCMA adaptive interference cancellation VFF-RLS algorithm