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.
出处
《电路与系统学报》
北大核心
2013年第1期150-155,共6页
Journal of Circuits and Systems
关键词
MIMO系统
正交空时分组码
高阶累积量
特征参数
multiple-input-multiple-output （MIMO） systems
orthogonal space-time block coding （OSTBC）
higher-ordercumulants
characteristic parameters
