A New Precoder Design for Downlink Multiuser Multi-relay MIMO systems

• Main Authors: Shih Kai Chou, 周士凱
• Other Authors: Chiao En Chen
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/249bt8

碩士 === 國立中正大學 === 通訊工程研究所 === 102 === In recent years, multiple-input-multiple-output (MIMO) communication has become a key technology due to the increasing demand of high speed wireless communications services. Among a number of MIMO techniques, relay transmission can be used to further expand the coverage or increase the system capacity. In this thesis, we investigate in the precoders design problem in MIMO multiple relay systems. Our approach is based on the method of gradient descent, which is known to be a low-cost algorithm which ensures local convergence in non-convex problems. We derive a gradient expression of the weighted sum MSE and then determine the weighted sum rate gradient from a relation between the differentials of the sum MSE and those of the sum rate to jointly design precoders in multiuser multi-relay MIMO systems. The proposed algorithm is verified and compared with a number of existing designs via extensive computer simulations.