摘要
在OFDM系统中,限幅常用于抑制信号的峰平比,而限幅会引入额外的限幅噪声,以致干扰数据和导引符号,恶化传输性能.本文针对限幅OFDM系统,提出一种基于导引符号的限幅噪声消除算法.该算法在插入导引符号之前,滤除位于导引位置的限幅噪声,从而改善信道估计性能.在此基础上,本文还提出了利用迭代算法以进一步提高信道估计精确度.本文对所提出的限幅噪声消除算法及迭代算法进行了仿真验证,结果表明,新算法能够明显改善信道估计,优化传输性能.
In OFDM systems,clipping is often used to control the high peak-to-average power ratio （PAPR） of signal. Clipping will introduce additional clipping noise on both data and pilot symbols,so as to degrade the system performance. A new technique is proposed to cancel the clipping noise on pilot symbols for clipped OFDM systems. The new technique is based on directly filtering the clipping noise on the positions of pilot symbols before they are inserted into the data.Based on the new technique,an iterafive method is proposed to further improve the performance of channel estimation. The simulation results are also given. It is shown that the new technique and the iterative method can effectively improve the performance of channel estimation,so as to improve the system performance.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2006年第10期1860-1863,共4页
Acta Electronica Sinica
基金
国家自然科学基金(No.60272009
No.6039540-3)
863国家高技术研究发展计划基金(No.2001AA230131)
