基于噪声消除的OFDM-CDM收发方案  

Noise Reduction Based Transceiver Scheme for OFDM-CDM

作　　者：陈旭锋[1] 许小丰[2] 杨凯[1] 马量[1] 

机构地区：[1]中国人民解放军63888部队 [2]北京邮电大学电信工程学院

出　　处：《微计算机信息》2009年第33期123-125,共3页Control & Automation

摘　　要：本文主要针对如何提高非满负荷工作时的正交频分复用-码分复用(OFDM-CDM)系统的传输可靠性进行研究。基于解扩后所得数据内噪声信号的相关性,利用由冗余的扩频码得到的噪声信号,估计并且消除数据内的噪声。文中详细推导了基于最小二乘(LS)准则的最优噪声消除滤波器,有效提高信噪比,改善误码率(BER)性能。仿真实验表明,该方法优于采用传统均衡算法的系统性能。In this paper, how to boost the transmission reliability of Orthogonal Frequency Division Multiplexing-Code Division Multiplexing （OFDM-CDM） system working under non-full load is studied. Based on the correlation among the noise signals within despread data, the noise signals obtained by redundant spreading codes are utilized to estimate and cancel the noises in the expected data. The optimal noise reduction filter based on least squares （LS） has been derived. With the help of this filter, the signal to noise rate （SNR） is enhanced and the bit error rate （BER） is improved. Simulation results suggest that good performance can be achieved with proposed scheme.

关 键 词：正交频分复用 噪声消除 最小二乘 传输可靠性 

分 类 号：TN911[电子电信—通信与信息系统]