多用户MCDS-CDMA系统中的时频域信道估计方法  

Channel Estimation in Time Domain and Frequency Domain for Multiuser MC DS-CDMA Systems

作　　者：居美艳[1] 冉明 

机构地区：[1]河海大学计算机及信息工程学院,南京210098 [2]伸兴通讯公司,南京210012

出　　处：《电子与信息学报》2008年第10期2537-2540,共4页Journal of Electronics & Information Technology

摘　　要：该文提出了一种用于多用户MC DS-CDMA系统的信道估计方法,该方法在平均时域估计的基础上迭代一次平均频域信道估计,较好地改善了信道估计的性能。仿真结果表明,经过平均时域信道估计方法能较大程度地滤除多址干扰(MAI)和噪声,提高信道估计的准确性。再经过迭代一次平均频域信道估计,系统的误码率(BER)性能还可进一步改善,经过两次信道估计,系统取得的性能已很接近理想估计的性能。This paper proposes one channel estimation scheme for multiuser MC DS-CDMA systems. Based on the averaged channel estimation in time domain, the averaged channel estimation in frequency domain is used to improve further the performance of channel estimation. The simulation results show that the averaged channel estimation in time domain could largely filter out the Multiple Access Interference （MAI） and noise and improve the accuracy of channel estimation. Followed by one averaged channel estimation in frequency domain, the BER performance of systems still has further improvement. After two times of channel estimation, the system performance approximates to that of the ideal channel estimation.

关 键 词：MC DS—CDMA 信道估计 时域信道估计 频域信道估计 

分 类 号：TN914.5[电子电信—通信与信息系统]