摘要
本文基于最大信号噪声比准则(MSNR,Maximum Signal Noise Ratio)提出一种新的下行波束形成方法,即根据天线收发的互易性原理,通过上行波束形成得到的上行天线阵列矢量,变换而得到下行天线阵列矢量,再通过移动端Rake接收机的合作,反馈回每一径的衰落系数,考虑到存在传输和处理时延并且在此时间内信道有明显变化时,反馈的衰落系数存在误差。因此,本文采用了信道预测的方法,估计即时衰落系数,这样求得期望信号的相关矩阵,计算相应的最大广义特征值所对应的特征矢量,进行下行波束形成。
A new downlink beam-forming method is proposed based on Maximum Signal Noise Ratio Criterion. Based on the reciprocity theory of antenna, uplink beam-forming mechanism is analyzed to deduce the uplink antenna array vector, which is further transformed to get the downlink antenna array vector. The downlink vector is manipulated by the Rake mobile receiver to feedback the fade parameters for each path. Considering the existence of fed-back error because of the transmission and processing delay and considerable channel variation during the period of channel estimation, the instant fade-parameters is predicted using linear channel estimation. Accordingly, expected signal correlation matrix is attained and thus the eigenvector for the largest generalized eigenvalue can be computed to get through the downlink beam-forming process.
出处
《电路与系统学报》
CSCD
2004年第3期132-136,共5页
Journal of Circuits and Systems
基金
国家自然科学基金资助项目(60072016)
教育部科学技术研究重点项目(重点02171)
关键词
下行波束形成
互易性原理
线性预测
最大多普勒频移
downlink beamforming
reciprocity theory
linear prediction
the maximum doppler shift
