OSTBC信号累积量的特征分析
The characteristic analysis of cumulants of the OSTBC signals
赵知劲 1谢少萍 2王海泉2
作者信息
- 1. 杭州电子科技大学,浙江杭州310018;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
- 2. 杭州电子科技大学,浙江杭州310018
- 折叠
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m20(0)和m21(0)、四阶矩m40x(0,0,0)和m42x(0,0,0)、四阶累积量C40x(0,0,0)和C42x(0,0,0).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.
Abstract
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Key words
multiple-input-multiple-output (MIMO) systems/orthogonal space-time block coding (OSTBC)/higher-order cumulants/characteristic parameters引用本文复制引用
出版年
2013
NETL
NSTL
维普
万方数据