Pilot-aided channel estimation for CDD-OFDM systems  

作　　者：FAN JianCun , YIN QinYe & WANG WenJie MOE Key Laboratory for Intelligent Networks and Network Security, Institute of Information Engineering, Xi’an Jiaotong University, Xi’an 710049, China 

出　　处：《Science China(Information Sciences)》2010年第2期379-389,共11页中国科学（信息科学）（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 60772095, 60971113);the Doctoral Foundation of Ministry of Education of China (Grant No. 200806980020);the Foundation for Innovative Research Groups of the National Natural Science Foundation of China (Grant No. 60921003)

摘　　要：Cyclic delay diversity （CDD） is a low-complexity transmit diversity technique for coded orthogonal frequency division multiplexing （OFDM）, which transforms a multiple-input channel into an equivalent singleinput channel with increased frequency selectivity and provides additional frequency diversity. However, it makes channel estimation more difficult due to the increased frequency selectivity. In this paper, focusing on the direct estimation of the equivalent single-input channel for CDD-OFDM systems, a cyclic cross-correlation channel estimation method based on the equispaced constant-modulus pilot structure is first proposed. Using the statistical parameters of the channel and noise derived by the cyclic cross-correlation channel estimation, an improved channel estimation method based on the Wiener filter is proposed to reduce the estimation error further. Lastly, computation simulations are given to demonstrate the effectiveness of two proposed channel estimation methods for CDD-OFDM systems.Cyclic delay diversity （CDD） is a low-complexity transmit diversity technique for coded orthogonal frequency division multiplexing （OFDM）, which transforms a multiple-input channel into an equivalent singleinput channel with increased frequency selectivity and provides additional frequency diversity. However, it makes channel estimation more difficult due to the increased frequency selectivity. In this paper, focusing on the direct estimation of the equivalent single-input channel for CDD-OFDM systems, a cyclic cross-correlation channel estimation method based on the equispaced constant-modulus pilot structure is first proposed. Using the statistical parameters of the channel and noise derived by the cyclic cross-correlation channel estimation, an improved channel estimation method based on the Wiener filter is proposed to reduce the estimation error further. Lastly, computation simulations are given to demonstrate the effectiveness of two proposed channel estimation methods for CDD-OFDM systems.

关 键 词：channel estimation cyclic delay diversity OFDM systems cyclic cross-correlation Wiener filter 

分 类 号：TN919.3[电子电信—通信与信息系统]