ML integer frequency offset estimation for OFDM systems with null subcarriers:Estimation range and pilot design  

作　　者：SHU Feng BERBER Stevan WANG DongMing ZHANG QinChuan WANG Mao 

机构地区：[1]School of Electronic and Optical Engineering, Nanjing University of Science and Technology~ Nanjing 210094, China [2]National Moible Communication Research Lab, Southeast University, Nanjing 210096, China [3]Department of Electrical Engineering, University of Texas at Dallas, Texas 75080, USA [4]Department of Electrical Engineering and Computer Engineering, the University of Auckland, Auckland 1142, New Zealand

出　　处：《Science China(Information Sciences)》2010年第12期2567-2575,共9页中国科学（信息科学）（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No. 60702028);the Research Fund of National Mobile Communications Research Laboratory,Southeast University,China (Grant No. 2010D13);the Aeronautics Fund of 8511 Research Institute of China Aerospace Science & Industry Corporation (Grant No. KM04214)

摘　　要：In this paper the estimation range （ERG） of any null subcarriers （NSC） placement is further investigated and sufficient and necessary conditions of an NSC allocation that achieves a full ERG are defined. Then, a perfect distributed NSC allocation with the NSC distance larger than coherent bandwidth is devised to fully exploit frequency diversity of wireless channels and achieve a full ERG. Simulations confirmed that the propsoed FFT-based ML method of using this NSC placement has a smaller bandwidth overhead, achieves a fuller ERG and provides a better performance than the existing methods of using the consecutive NSC allocation at middle and high signal-to-noise ratios （SNRs）.In this paper the estimation range （ERG） of any null subcarriers （NSC） placement is further investigated and sufficient and necessary conditions of an NSC allocation that achieves a full ERG are defined. Then, a perfect distributed NSC allocation with the NSC distance larger than coherent bandwidth is devised to fully exploit frequency diversity of wireless channels and achieve a full ERG. Simulations confirmed that the propsoed FFT-based ML method of using this NSC placement has a smaller bandwidth overhead, achieves a fuller ERG and provides a better performance than the existing methods of using the consecutive NSC allocation at middle and high signal-to-noise ratios （SNRs）.

关 键 词：orthogonal frequency division multiplexing （OFDM） null subcarrier estimation range integer carrier frequency offset false detection probability frequency-selective fading 

分 类 号：TN919.3[电子电信—通信与信息系统]