OSTBC信号累积量的特征分析  

The characteristic analysis of cumulants of the OSTBC signals

作　　者：赵知劲[1,2] 谢少萍[1] 王海泉[1] 

机构地区：[1]杭州电子科技大学,浙江杭州310018 [2]中国电子科技集团第36研究所通信系统信息控制技术国家级重点实验室,浙江嘉兴314001

出　　处：《电路与系统学报》2013年第1期150-155,共6页Journal of Circuits and Systems

摘　　要：本文针对MIMO系统的空时码识别问题,研究正交空时分组码(OSTBC)信号的高阶统计量特性。利用OSTBC信号的正交特性,推导给出了OSTBC信号的二阶矩m 20(0)和m 2 1(0)、四阶矩m 40 x(0,0,0)和m 4 2 x(0,0,0)、四阶累积量4 0 x(0,0,0)C和4 2 x(0,0,0)C。由于四阶累积量抑制噪声能力强,提出了基于四阶累积量的OSTBC信号的两个特征参数。对两种编码方案的仿真结果表明,当信噪比大于0dB时,两个特征参数的估计值基本等于理论值;对不同编码方案,这两个特征参数区分度高,因此这两个特征参数可用于OSTBC编码方案的信号识别。In the light of the problem of blind recognition for space-time coding scheme used in multiple-input-multiple-output（MIMO） communication systems,the higher-order statistics properties of orthogonal space-time block coding（OSTBC） signals are studied.Utilizing the orthogonal properties of OSTBC signals,the second-order moments,fourth-order moments and fourth-order cumulants of the OSTBC signal are derived.As the fourth-order cumulant with a strong ability to suppress noise,two characteristic parameters of OSTBC signals based on fourth-order cumulant are proposed.Simulation results of two coding schemes show that the estimations of these two characteristic parameters are equal to theory values at SNR 0,and there is a very distinct between the two coding schemes.Therefore,the two characteristic parameters can be used to identify OSTBC signals.

关 键 词：MIMO系统 正交空时分组码 高阶累积量 特征参数 

分 类 号：TN911.7[电子电信—通信与信息系统]