基于EM的联合信道参数估计和数据检测算法

张蕊萍; 张太镒; 龚政委

基于EM的联合信道参数估计和数据检测算法

张蕊萍^{①②;张太镒},
张太镒,
龚政委

计量
- 文章访问数: 2320
- HTML全文浏览量: 71
- PDF下载量: 817
- 被引次数: 0
出版历程
- 收稿日期: 2005-04-11
- 修回日期: 2005-11-22
- 刊出日期: 2006-11-19

EM-Based Joint Channel Estimation and Data Detection Algorithm

摘要

摘要: 为提高OFDM系统的传输效率，考虑正交频分复用(OFDM)系统的特殊结构，该文提出一种使用少量导频的EM(Expectation Maximization)迭代信道参数估计算法。在每次迭代中不但更新信道冲激响应而且更新噪声方差的估计值。为进一步提高算法的收敛速度，提出联合信道参数估计和数据检测算法。仿真结果表明，在插入较少导频时，基于EM的信道估计算法仍能收敛到给定参数的信道，联合信道参数估计和数据检测算法迭代次数明显减少，并且保持系统的误码率性能不变。
- 正交频分复用; 相关检测; 信道估计; EM算法
Abstract: To improve transmission efficiency, Expectation Maximization(EM) based channel parameters estimation iteration algorithm is proposed, employed the special features of Orthogonal Frequency Division Multiplexing (OFDM) system. Channel impulse response is updated at each iteration, furthermore the noise variance is update also. To improve the algorithm convergence, EM-based joint channel parameters estimation and data detection algorithm is proposed. Simulation results demonstrate the proposed EM-based algorithm can converge to the case with known channel parameters with fewer pilots and the joint channel parameters estimation and data detection algorithm converges significantly fast.

HTML全文

参考文献(1)

Li Ye.Pilot-symbol-aided channel estimation for OFDM in wireless systems. IEEE Trans Technol., 2000, 49(4)1207-1215[2]Van de Beek J, Edfors O, Sandell M, Wilson S K, Porjesson O B. On channel estimation in OFDM systems. IEEE Vehicular Technology Conf., Chicago, 1995: 815-819.[3]Moon J K, Choi S I. Performance of channel estimation methods for OFDM systems in a multipath fading channels. IEEbConsumerElectronics, 2000, 46(1):161-170.[4]Michail K T, Ceorgios B C. Subspace methods for blind estimation of time-varying FIR channels[J].IEEE Trans. on Signal Processing.1997, 45(12):3084-3093[5]Chang M X, Su Yu T. Blind and semiblind detections of OFDM signals in fading channels. 2004, 52(5): 744-754.[6]Muquet B, De Courville M, Duhamel P. Subspace-based blind and semi-blind channel estimation for OFDM systems[J].Trans. on Signal Processing.2002, 50(7):1699-1712[7]Cai Jun, Shen Xuemin, Mark J W. EM channel estimation algorithm for OFDM wireless communication systems. Personal, Indoor and Mobile Radio Communications, PIMRC2003, Beijing,2003: 804-808[8]Ma Xiaoqiang, Kobayashi H, Schwartz S C. EM-based channel estimation of OFDM signals. Wireless Communications and Networking Conference, WCNC2002, Orlando, 2002: 228-232.[9]Dempster A P, Laird N M, Rubin D B. Maximum likelihood estimation from incomplete data. Journal of the Royal Statistical Societ (B), 1977, 39(1): 1-38.

施引文献

资源附件(0)

访问统计