电测与仪表2011，Vol.48Issue(2)：50-53,4.
一种基于周期失配序列的OFDM时变信道估计
Channel Estimation for Time- Varing Channel Based on Periodic Mismatched Sequence in OFDM Systems
摘要
Abstract
A new approach which using to add periodic mismatched sequence to OFDM signals as training sequence to channel estimation in OFDM systems is proposed. The energy of periodic sequence mainly concentrates in a few pilot points, so after FFT transformation, periodic mismatched sequence is inserted into OFDM signals. To calculate the cross- correlation between the received mismatched sequence in a few pilot points and the circular shifted mismatch filter coefficient solves the channel impulse response. Comparison has been done between the proposed algorithm and the existing algorithm in the time -varying multipath channel. Simulation results show that the new algorithm effectively reduces the value of MSE and BER in low complexity. Especially in the OFDM systems with more sub - carrier number and low SNR, the performance is improved obviously.关键词
OFDM/信道估计/周期序列/失配序列Key words
OFDM/ channel estimation/ periodic sequence/ mismatched sequence分类
信息技术与安全科学引用本文复制引用
王凤娟,肖丽萍,于丰彩..一种基于周期失配序列的OFDM时变信道估计[J].电测与仪表,2011,48(2):50-53,4.基金项目
国家自然科学基金资助项目(60872061) （60872061）
河北省自然科学基金资助项目(F200800855) （F200800855）
