基于信號(hào)周期平穩(wěn)特性的OFDM系統(tǒng)時(shí)頻參數(shù)盲估計(jì)算法
A Cyclostationarity-Based Blind Algorithm for Estimating Time-Frequency Parameters in OFDM Systems
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摘要: 該文考慮移動(dòng)通信信道下的OFDM系統(tǒng)同步參數(shù)估計(jì)問(wèn)題，通過(guò)對(duì)接收信號(hào)進(jìn)行采樣，獲得具有周期平穩(wěn)特性的序列，在此基礎(chǔ)上提出一種基于OFDM信號(hào)周期平穩(wěn)特性的系統(tǒng)時(shí)延和頻偏盲估計(jì)算法，并對(duì)算法進(jìn)行時(shí)頻參數(shù)估計(jì)范圍和誤差來(lái)源分析。理論分析和仿真結(jié)果表明，該算法不僅適用于頻率選擇性衰落信道，而且與同類的方法比較，具有更大的頻偏估計(jì)范圍和更高的估計(jì)精度。
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關(guān)鍵詞:
- OFDM;周期平穩(wěn)特性;盲時(shí)頻參數(shù)估計(jì)
Abstract: The problem on the time-frequency parameters estimation in the mobile channel is considered in this paper. For this aim, a blind algorithm is proposed, which is based on the cyclostationarity property of the received signal. Theoralic analysis and simulation results are provided to show that this algorithm is suitable for a frequency selective fading channel. When compared with the other method, its ability to estimate a larger frequency offset and higher estimation resolution are shown. -
Schmidl T M, Cox D C. Robust frequency and timing synchronization for OFDM[J].IEEE Trans. on Communications.1997, 45(12):1613-1621[2]Coulson A J. Maximum likelihood synchronization for OFDM using a pilot symbol: Algorithms[J].IEEE Journal on Selected Areas in Communications.2001, 19(12):2486-2494[3]Bolcskei H. Blind estimation of symbol timing and carrier frequency offset in wireless OFDM systems[J].IEEE Trans. on Communications.2001, 49(6):988-996[4]Wang Liang, Shan Xiuming, Ren Yong. A new synchronization algorithm for OFDM systems in multipath environment. 8th International Conference on Communication Systems, Singapore, 2002, vol.1: 255-259.[5]Park B, Cheon H, Ko E. A blind OFDM synchronization algorithm based on cyclic correlation[J].IEEE Signal Processing Letters.2004, 11(2):83-85[6]Gardner W A. Exploitation of spectral redundancy in cyclostationary signals. IEEE Signal Processing Magazine, 1991, 4: 14-36.[7]Proakis J G. Digital Communications, 3rd, New York: McGraw-Hill, 1995, Chap.1. -
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