摘要
文章研究了可以获得MIMO系统慢衰落信道中下行链路多用户分集增益和复用增益的机会波束形成(OBF)技术,并将其扩展到接收端多天线的情况下,发射端采用基于微时隙的波束选择技术进一步提高系统容量。每个微时隙基站利用随机产生的酉矩阵将M个数据子流承载在M个随机波束上进行发送,根据每个用户的反馈信干噪比机会地决定接收用户。最后系统选择使其容量最大的正交酉矩阵发送数据,并用注水算法进行功率分配进一步提高系统吞吐量。文中提出方法的优点在于,在接收端多天线的情况下系统通过波束选择技术进一步提高系统吞吐量。
In this paper, the opportunistic beamforming technology for the downlink of multiuser MIMO systems is extended to the case with multi-antenna receiver, while the transmitter use beam selection based on the mini-slot to improve the system capacity. Then the base station selects the unitary matrix to maximize the system capacity. In addition, the channel capacity is further maximized by utilizing waterfilling power allocation. The main advantage of the proposed system is to provide throughput gains further for the MIMO broadcast channel with beam selection when there are several antennas on the receiver.
出处
《自动化技术与应用》
2009年第8期49-52,共4页
Techniques of Automation and Applications
