摘要
在时变信道下正交频分复用(OFDM)系统中,通过导频辅助,提出基于可变遗忘因子RLS(VFF-RLS)的载波频偏(CFO)估计改进算法。针对传统RLS(CFF-RLS)算法中遗忘因子无法同时满足CFO估计收敛速度和收敛精度的缺陷,设计了线性变化遗忘因子(LFF)和非线性变化遗忘因子(NLFF)两种可变遗忘因子方案来提升CFO估计性能。仿真结果显示:在低信噪比的情形下,基于VFF-RLS算法的CFO估计性能明显优于基于CFF-RLS算法的CFO估计性能。
In orthogonal frequency division multiplexing （OFDM） systems over time-varying multipath channel, the improved pilot-aided carrier fre- quency offset （CFO） estimation algorithm based on variable forgetting factor RLS （VFF-RIS） is proposed. Aiming at the defect of constant forgetting factor in traditional RLS （CFF-RKS） algorithm can＇ t simultaneously satisfy convergence speed and convergence accuracy of CFO estimation. In this pa- per, two variable forgetting factor schemes are designed for improving CFO estimation performance, namely linear variation forgetting factor（LFF） and non-linear variation forgetting factor（NEFF）, The simulation results show that the CFO estimation performance based on VFF-RLS significantly better than the CFO estimation performance based on CFF-RLS algorithm in low SNR conditions.
出处
《电视技术》
北大核心
2014年第3期135-137,145,共4页
Video Engineering
基金
广东省自然科学基金项目(S2011040003956)
