Blind synchronization scheme using the conjugate characters of the OFDM BPSK-modulated symbol

University of Taipei > 理學院 > 資訊科學系 > 期刊論文 > Item 987654321/4715

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题名:	Blind synchronization scheme using the conjugate characters of the OFDM BPSK-modulated symbol
作者:	Cheng-Ying Yang 楊政穎 Gwo-Ruey Lee Wen-Hui Kuan Jyh-Horng Wen
贡献者:	臺北市立教育大學資訊科學系
关键词:	OFDM systems Symbol synchronization Timing estimation Conjugate characters BPSK modulation
日期:	2011-12
上传时间:	2011-12-01 10:14:04 (UTC+8)
摘要:	Previously, Beekʼs scheme for timing and frequency offset estimation in the OFDM system employs cyclic prefix (CP) has been proposed under the assumption of independent identified distributed (i.i.d.) OFDM symbols. Actually, the real data in the OFDM modulated symbol, transferred by the inverse fast Fourier transform (IFFT), has the characters of complex symmetry. With these characters, more information in the whole OFDM symbol could be used for the timing and frequency offset estimation. In this paper, two conjugate symmetry characters of the OFDM BPSK-modulated symbol are used to achieve blind timing estimation algorithm in the OFDM systems. One is symbol-based symmetry and the other is CP-based symmetry. With these two conjugate characters applied to the proposed algorithm, the timing of the OFDM BPSK-modulated symbol could be derived. Under an AWGN channel, based on the performance of lose symbol timing rate and estimator mean square error, the proposed algorithm is with a tremendous improvement compared with Beekʼs estimation method. Under a multipath fading channel, the results show that performance including lose symbol timing rate and estimator MSE with the proposed algorithm is better than those algorithms with Beekʼs estimation method. In practical OFDM applied system, the OFDM BPSK-modulated symbol could be used to replace the preamble or training sequences in the standard to obtain an accurate timing and frequency offset estimation and to avoid the data rate decreasing with the proposed algorithm.
關聯:	Digital Signal Processing Volume 21, Issue 6 P.710-717
显示于类别:	[資訊科學系] 期刊論文

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