Novel time-frequency differential space-time modulation for multi-antenna OFDM systems  

作　　者：Tian Jifeng Jiang Haining Song Wentao Luo Hanwen Xu Youyun 

机构地区：[1]Dept. of Electronic Engineering, Shanghai Jiaotong Univ., Shanghai 200030, P.R. China

出　　处：《Journal of Systems Engineering and Electronics》2006年第1期54-58,共5页系统工程与电子技术（英文版）

基　　金：ThisprojectwassupportedbytheNationalNaturalScienceFoundationofChina(60272079)andNational"863"HighTech-nologyDevelopmentProjectofChina(2003AA123310).

摘　　要：Differential space-time （DST） modulation has been proposed recently for multiple-antenna systems over Rayleigh fading channels, where neither the transmitter nor the receiver knows the fading coefficients. Among existing schemes, differential modulation is always performed in the time domain and suffers performance degradations in frequency-selective fading channels. In order to combat the fast time and frequency-selective fading, a novel time-frequency differential space-time （TF-DST） modulation scheme, which adopts differential modulation in both time and frequency domains, is proposed for multi-antenna orthogonal frequency division multiplexing （OFDM） system. A corresponding suboptimal yet low-complexity non-coherent detection approach is also proposed. Simulation results demonstrate that the proposed system is robust for time and frequency-selective Rayleigh fading channels.Differential space-time （DST） modulation has been proposed recently for multiple-antenna systems over Rayleigh fading channels, where neither the transmitter nor the receiver knows the fading coefficients. Among existing schemes, differential modulation is always performed in the time domain and suffers performance degradations in frequency-selective fading channels. In order to combat the fast time and frequency-selective fading, a novel time-frequency differential space-time （TF-DST） modulation scheme, which adopts differential modulation in both time and frequency domains, is proposed for multi-antenna orthogonal frequency division multiplexing （OFDM） system. A corresponding suboptimal yet low-complexity non-coherent detection approach is also proposed. Simulation results demonstrate that the proposed system is robust for time and frequency-selective Rayleigh fading channels.

关 键 词：differential space-time modulation MIMO OFDM time-varying channel. 

分 类 号：TN92[电子电信—通信与信息系统]