学术
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。[著者文摘]
文章出处:
《电子与信息学报》-2008年30卷2期 -346-349页
栏目信息:
分 类 号:
文献标识码:
A
文章编号:
1009-5896（2008）02-0346-04
Blind Estimation of OFDM Sub-carrier Frequencies Based on the High-Order Cyclic Cumulants
Zheng Wen-xiu ,Zhao Guo-qing ,Luo Ming （School of Electronic Engineering, Xidian Univ., Xi＇an 710071, China）
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.[著者文摘]
Key words:
Military electronic countermeasures; OFDM; Carrier estimation; Cumulants
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