基于矢量扰动的网络MIMO预编码技术研究

网络MIMO（Network MIMO）技术是降低相邻小区间共信道干扰、提高网络频谱利用率的有效途径，已经成为4G的关键技术之一，与此同时，世界范围内掀起了通信业节能减排的新变革。在此背景下，本研究以提高网络MIMO系统的"绿色效率"为目标，将多用户多流矢量扰动（Vector Perturbation）预编码引入到网络MIMO系统中，从利用稀疏近似逆等矩阵相关理论解决大天线数、大用户数下矢量扰动预编码器复杂度的问题出发，研究基于矢量扰动的有限协作预编码器和分布式预编码器两种结构，以及相应的鲁棒方案，达到降低小区间的干扰，并降低整网发射功率的效果；进一步，通过绿色效应的研究，优化网络MIMO矢量扰动预编码器的功率分配策略与传输模式，使网络MIMO系统兼顾频谱效率与能量效率。本课题的研究将会对未来绿色无线高速传输网络的发展起到积极的推动作用。

Network MIMO is an efficient way to reduce co-channel interference between adjacent cells and improve network spectrum utilization, which has been chosen as one key technique of 4G. At the same time, the new trend of energy saving in mobile telecommunication industries is inexorable. At this background, we are aim to improve the "green efficiency" of network MIMO systems in this research project by introducing the multi-user multi-stream vector perturbation precoding method to network MIMO systems. At first, we have to resolve the very high computational complexity problem of vector perturbation precoder at large number of antennas and users by using sparse approximate inverse theory. Then, limited coordination based vector perturbation precoder and distributed vector perturbation precoder need to be designed to reduce the interference between adjacent cells and cut down the consumption of total transmit power of the network. In addition, their robust schemes will be investigated. Furthermore, on the basis of greening effect, we will optimize the power allocation strategy and transmission mode considering both spectral efficiency and energy efficiency. These researches will contribute to the key techniques of future high data rate green wireless networks.