OFDM系统中一种维纳LMS信道跟踪算法

白宾锋; 蔡跃明; 徐友云

OFDM系统中一种维纳LMS信道跟踪算法

计量
- 文章访问数: 2550
- HTML全文浏览量: 94
- PDF下载量: 868
- 被引次数: 0
出版历程
- 收稿日期: 2004-11-19
- 修回日期: 2005-04-08
- 刊出日期: 2005-11-19

A Wiener LMS Channel Tracking Algorithm for OFDM Systems

摘要

摘要: 结合OFDM系统的特点，该文讨论了维纳最小均方(WLMS)算法在OFDM系统中应用的可行性。推导了WLMS信道跟踪算法在OFDM系统中的频域表达式。利用信道响应的频域相关特性，在每一次迭代过程中叠加一个频域滤波器，使算法的性能得到提高。仿真结果表明，选择合适的步长，算法误符号率性能基本接近理想估计的性能界。
- 正交频分复用;信道跟踪;维纳最小均方误差
Abstract: Based on the property of OFDM systems, this paper discusses the feasibility of Wiener LMS algorithm in OFDM systems, and derives the frequency expression of the WLMS channel prediction algorithm for OFDM systems. The performance of the algorithm is greatly improved by using a frequency domain filter, which is derived based on the correlations of channel response in frequency domain, in each iteration. The simulation results show that the performance of uncoded Symbol Error Rate (SER) can reach the bound of ideal channel estimation at the proper step size.

HTML全文

参考文献(1)

Bingham J A C. Multicarrier modulation for data transmission: An idea whose time has come. IEEE Communication Magazine, 1990, 37(5): 5-14.[2]Hoeher P, Kaiser S, Robertson I, et al.. Two-dimensional pilot- symbol-aided channel estimation by wiener filtering. International Conference on Acoustics, Speech, and Signal Processing, Munich, Germany, 1997: 1845-1848.[3]Y Li, et al.. Robust channel estimation for OFDM system with rapid dispersive fading channels[J].IEEE Transaction on Communication.1998, 46(7):902-915[4]Van der Veen A, et.al.. Subspace-based signal analysis using singular value decomposition[J].Proc IEEE.1993, 81(9):1277-1308[5]Cai X, Akansu A N. A subspace method for blind channel identification in OFDM systems. IEEE International Conference on Communications, New Orleans, USA, July 2000: 929-933.[6]Mignone V, Morello A. CD3-OFDM: A novel demodulation scheme for fixed and mobile recivers[J].IEEE Trans on Communications.1996, 44(9):1144-1151[7]Ahlen A, Sternad M. Wiener filter design using polynomial equations[J].IEEE Trans on Signal Processing.1991, 39(11):2387-2399[8]Lindbom L, et al.. Tracking of timing-varying mobile radio channels-PartⅠ: The Wiener LMS algorithm, IEEE Trans on Communications, 2001,49(12): 2207-2217.[9]徐信, 白宾锋, 蔡跃明. 无线OFDM系统中基于导频信道估计方法的性能比较. 解放军理工大学学报，2003, 4(6): 10-15.[10]Jakes W C. Microwave mobile communications. New York: Wiley-Interscience, 1974, chapter 1.[11]Zheng Y R, Xiao C. Simulation models with correct statistical properties for Rayleigh fading channels[J].IEEE Trans. on Communications.2003, 51(6):920-928[12]Commission of the European Communities. Digital Land Mobile Radio Communications-COST 207. 1989.

施引文献

资源附件(0)

访问统计