基于理想自相关训练序列的双选信道估计方法
doi: 10.3724/SP.J.1146.2007.00553
Doubly Selective Channel Estimation Based on Ideal Autocorrelation Sequence
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摘要: 高速移动下的无线宽带通信要经历时间和频率双选择性衰落，近些年来双选信道的估计越来越受到关注。该文利用复指数基扩展模型(BEM)，提出一种基于理想自相关训练序列的双选信道估计方法，其训练序列的能量均匀分布，能够消除峰均比的问题。文中分析并证明了具有理想自相关特性等间隔放置的训练序列，能够使信道估计的MSE最小化。仿真表明与传统的zero-padding方式信道估计相比，在获得相同信道估计性能的情况下，采用该文信道估计方法的系统的峰均比有很大改善。Abstract: High data rates and high mobility-induced Doppler shifts introduce time- and frequency-selectivity in wireless links. Recently, doubly selective channel estimation has attracted much attention. In this paper, using a basis expansion channel model, a scheme based on ideal autocorrelation sequence is proposed for the estimation of doubly selective channel parameters. The training sequences have constant modulus so that large peak-to-average ratio problem can be avoided. It has been shown that the employment of this optimal pilot sequence can minimize Mean-Square Error (MSE) of the channel estimation. Simulation results demonstrate that the peak-to-average ratio of the proposed scheme is considerably improved compared to the existing zero-padding scheme for the same MSE performance.
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[1] Choi Y S, Voltz P J, and Cassara F A. On channelestimation and detection for multicarrier signals in fast andselective Rayleigh fading channels[J].IEEE Trans. onCommun.2001, 49(8):1375-1387 [2] Schniter P. Low-complexity estimation of doubly selectivechannels. In Proc. IEEE Workshop Signal ProcessingAdvances in Wireless Commun., Rome, Italy, June 15-18,2003: 200-204. [3] Cavers J K. An analysis of pilot symbol assisted modulationfor Rayleigh fading channels. IEEE Trans. on VehicularTechnology, 1991, 40(4): 686-693. [4] Ma Xiaoli, Giannakis G B, and Ohno S. Optimal training forblock transmissions over doubly-selective wireless fadingchannels[J].IEEE Trans. on Signal Processing.2003, 51(5):1351-1366 [5] Giannakis G B and Tepedelenlioglu C. Basis expansionmodels and diversity techniques for blind identification andequalization of time varying channels[J].Proc. IEEE.1998,86(10):1969-1986 [6] Tsatsanis M K and Giannakis G B. Equalization of rapidlyfading channels: Self-recovering methods[J].IEEE Trans. onCommun.1996, 44(5):619-630 [7] Suehiro N and Hatori M. Modulatable orthogonal sequencesand their application to SSMA systems[J].IEEE Trans. onInformation Theory.1988, 34(1):93-100 -
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