UWB-OFDM系统的符号盲同步方法
doi: 10.3724/SP.J.1146.2005.01707
A Robust Blind Symbol-Timing Synchronization for UWB-OFDM Systems
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摘要: 该文提出一种适合于UWB-OFDM系统的符号盲同步方法。该方法是基于UWB-OFDM符号中的ZP功率出现规律性的分布特性，利用滑动窗能量检测的办法来进行符号同步。研究了高斯信道和UWB信道下的符号同步方法，并详细分析了UWB信道下接收信号的能量分布特性。为了提高同步性能，设计了多滑动窗方法代替双滑动窗方法。计算机仿真分析表明该方法无论在高斯还是UWB信道下都具有优异的性能。Abstract: A robust blind symbol-timing synchronization scheme applicable to UWB-OFDM systems is presented. The proposed method is based on ZP(Zero-padded Prefix) power collection in the UWB-OFDM symbols whose ZP average power distribute regularly in the slide windows. The synchronization schemes in both Gaussian channel and UWB channel are investigated. Average power distribution of the received signal in UWB channel is analysed detailedly in order that symbol synchronizes accurately. A multi_slide_windows method is designed in order to improve the performance of synchronization. Finally computer results are also demonstrate the superior performance of the new method in both Gaussian channel and UWB channel.
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IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs). Multi-band OFDM Physical Layer Proposal for IEEE 802.15 Task Group 3a[EB/OL]. 10 November, 2003.[2]Weinstein S and Ebert P. Data transmission by frequency-division multiplexing using the discrete Fourier transform[J].IEEE Trans. on Comm.1997, 19(5):628-634[3]Peled A and Ruiz A. Frequency domain data transmission using reduced computational complexity algorithms. Proc. IEEE Int. Conf. Acoust Speech Signal Proessing, Dener, 1980: 964-967.[4]Van de Beek J J, Sandell M, and Borjesson P O. ML estimation of time and frequency offset in OFDM systems[J].IEEE Trans. on Signal Processing.1997, 45(7):1800-1805[5]Foerster J. Channel modeling sub-committee report final. IEEE 802.15-02/490.[6]陈晨等. OFDM码元定时和频率偏差估计中的最佳相关长度分析. 西安电子科技大学学报，2003，30(5): 640-644. Chen Chen, et al.. Optimal correlation length of symbol timing and frequency offset estimation in OFDM systems. Journal of Xidian University(Natural Science), 2003, 30(5): 640-644. -
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