作　　者： ; ; ;

机构地区： 河南科技大学电子信息工程学院

出　　处： 《电视技术》 2013年第15期144-147,共4页

摘　　要： 为辅助实现多天线单载波频域均衡超宽带系统相干检测,提出一种新的信噪比估计方法。该方法在不同发射天线传输满足空间复用条件的导频序列,接收端首先获得多天线子信道最小二乘估计,再根据信道共轭对称特性构造噪声采样矢量,然后应用克拉美罗定理获得噪声方差信息,最后联合二者计算系统的信噪比值。仿真结果表明:和传统方法不同,提出方法不仅在高信噪比端大大提高了估计精度,而且可以和简单易执行的最小二乘信道估计器同时使用。 In order to assist the implementation of receiver＇s coherent detection, a new signal-to-noise ratio （SNR） estimation approach is proposed for multi-antenna single-carrier frequency domain equalization （SC-FDE） uhra-wideband （UWB） systems. Firstly, it allocates the preamble sequences from the different transmitters at the spatial multiplexing mode. At the receivers, the multi-antenna sub-channels parameters can be estimated by the least square （LS） rule, by which the noise sample vector can be constructed by exploiting the characteristic of channel＇ s conjugate symmetry. Secondly, the noise variance information can be obtained based on the Cramer-Rao lower bound theorem. Finally, the noise variance and channel estimation can be united for computing the SNR value. Through computer＇s simulation, different from the traditional methods, the proposed method can not only improve the estimation performance significantly over the high SNR region, but also be used with the LS channel estimator simple and easy to implement.

关 键 词： 超宽带 多输入多输出 信噪比估计 噪声方差估计 信道估计

领　　域： [电子电信] [电子电信]