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: |
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基金项目: |
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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 selfinterference cancellation for Paired Carrier Multiple Ac
cess(PCMA) is investigated. The influence of parameter estimation error on sel
finterference cancellation is analysed. The cancellation error is nonstatio
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 |