非数据辅助的OFDM系统符号同步算法
doi: 10.3724/SP.J.1146.2010.00487
Non-data-aided Symbol Synchronization Algorithm for OFDM Systems
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摘要: 该文中研究了OFDM系统中的非数据辅助符号同步问题。首先，假设OFDM相邻子载波信道的频域响应相同，建立了一种基于OFDM系统相邻子载波间功率差值平方的代价函数，通过对代价函数最小化得到了一种适用于基带调制为恒幅调制的OFDM系统的非数据辅助符号同步算法。然后，通过对信道进一步假设，得到了其它两种类似的代价函数，并对载波频偏及信道噪声对算法的影响和算法的运算量进行了分析和讨论。最后，通过计算机仿真对所得同步算法在不同代价函数及不同载波频偏时的性能进行了分析，并同其它两种已有同类算法进行了比较。仿真结果表明，所得算法的性能总体上优于其它两种已有同类算法。Abstract: Non-Data-Aided (NDA) symbol synchronization for Orthogonal Frequency Division Multiplexing (OFDM) systems is studied in this paper. Firstly, a cost function, which is based on the power difference between adjacent subcarriers of OFDM system with constant modulus signaling, is proposed by assuming that the adjacent subcarriers have the same channel frequency responses. And a NDA symbol synchronization algorithm is proposed by minimizing the cost function. Secondly, two similar cost functions are proposed. The complexity and the influence of carrier frequency offset and channel noise on the proposed algorithm are analyzed too. Finally, the performance of proposed algorithm is analyzed by computer simulation with different cost functions and different carrier frequency offset. The simulation results show that the proposed algorithm outperforms generally obviously two others previously algorithms.
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Bingham J A C. Multicarrier modulation for data transmission: An idea whose time has come [J].IEEE Communications Magazine.1990, 28(5):5-14[4]Van de Beek J J, Sandell M, and Brjesson P O. ML estimation of time and frequency offset in OFDM systems [J].IEEE Transactions on Signal Processing.1997, 45(7):1800-1805[5]Ma Shao-dan, Pan Xin-yue, and Yang Guang-hua, et al.. Blind symbol synchronization based on cyclic pre x for OFDM systems [J].IEEE Transactions on Vehicular Technology.2009, 58(4):1746-1750[6]Mo Rong-hong and Chew Yong-huat, et al.. A new blind joint timing and frequency offset estimator for OFDM systems over multipath fading channels [J].IEEE Transactions on Vehicular Technology.2008, 57(5):2947-2957[7]Chin Wen-long and Chen Sau-gee. A blind synchronizer for OFDM systems based on SINR maximization in multipath fading channels [J].IEEE Transactions on Vehicular Technology.2009, 58(2):625-635[8]Fusco T and Tanda M. Blind synchronization for OFDM systems in multipath channels [J].IEEE Transactions on Wireless Communications.2009, 8(3):1340-1348[9]Zeng Xiang-nian and Ghrayeb A. A blind carrier frequency offset estimation scheme for OFDM systems with constant modulus signaling [J].IEEE Transactions on Communications.2008, 56(7):1032-1037[10]Al-Dweik A, Hazmi A, and Younis S, et al.. Carrier frequency offset estimation for OFDM systems over mobile radio channels [J].IEEE Transactions on Vehicular Technology.2010, 59(2):974-979 -
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