基于高阶循环累积量的OFDM子载波盲估计
doi: 10.3724/SP.J.1146.2006.01093
Blind Estimation of OFDM Sub-carrier Frequencies Based on the High-Order Cyclic Cumulants
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摘要: 该文针对通信对抗和OFDM信号解调的实际应用，提出一种利用高阶循环累积量估计OFDM信号子载波的方法。由于高阶循环累积量能有效抑制平稳噪声和非平稳高斯噪声，通过理论分析可证明在上述噪声背景下，子载波采用2/4PSK调制的OFDM信号的特定四阶循环累积量仅在子载波处存在，因此可以通过检测此循环频率实现子载波的估计。该算法还可推广到采用星形QAM和高阶PSK调制的OFDM信号。仿真实验验证了该算法的有效性。Abstract: Aiming at the real application of the communication countermeasures and OFDM signal demodulation, a method is proposed to estimate the sub-carriers of OFDM signal using the high-order cyclic cumulants. Due to the fact that the high-order cyclic cumulants can suppress the stationary and non-stationary Gaussian noise, it is proved by theoretical analysis under the above noise background that the specific four-order cyclic cumulants of the OFDM signal with the 2/4 PSK modulation exist only at the location of its sub-carriers, so that the sub-carrier estimation can be implemented by detecting the cyclo-frequencies. The proposed method can also be popularized on the OFDM signal with star-QAM and high-order PSK modulation. And simulation proves the effectiveness of the proposed method.
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Cimini L J Jr.. Analysis and simulation of a digital mobilechannel using orthogonal frequency division multiplexing.IEEE Trans. on Commun., 1985, COM-33(7): 665-675.[2]Moose P H. A technique for orthogonal frequency divisionmultiplexing frequency offset correction[J].IEEE Trans. onCommun.1994, 42(10):2908-2914[3]Schmidl T M and Cox D C. Robust frequency and timingsynchronization for OFDM[J].IEEE Trans. on Commun.1997,45(12):1613-1621[4]Daffara F and Chouly A. Maximum-likelihood frequencydetectors for orthogonal multicarrier systems. IEEEInternational Conference on Communications, Geneva, May23-26,1993, 2: 766-771.[5]Luise M, Marselli M, and Reggiannini R. Low-complexityblind carrier frequency recovery for OFDM signals overfrequency-selective radio channels[J].IEEE Trans. onCommun.2002, 50(7):1182-1188[6]Morelli M, DAndrea A N, and Mengali U. Frequencyambiguity resolution in OFDM system[J].IEEE Commun. Lett.2000, 4(4):134-136[7]Lottici V, Luise M, and Marselli M, et al.. Blind subcarrierfrequency ambiguity resolution for OFDM signals overselective channels[J].IEEE Trans. on Commun.2004, 52(9):1532-1537[8]张贤达, 保铮. 通信信号处理. 第一版，北京：国防工业出版社，2000: 11-37.Zhang Xian-da and Bao Zheng. Communication SignalProcessing. First version, Beijing: National Defence IndustryPress, 2000: 11-37.[9]Swami A and Sadler B M. Hierarchical digital modulationclassification using cumulants[J].IEEE Trans. on Commun.2000, 48(3):416-429[10]郭里婷,朱近康. 基于OFDM信号周期平稳特性的盲信道估计算法[J].电子与信息学报.2006,28(2):198-202浏览 -
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