| 摘要: |
| 以降低系统反馈为目标，提出一种在多天线下行系统基于信干比门限反馈的自适应传
输策略。基于正交随机波束成形，提出仅当用户最大信干比超过门限时才将最大信干比和对
应的波束序号反馈给基站，并给出了系统平均总速率与该信干比门限的关系表达式。仿真结
果表明，通过选取有效的信干比门限，可在几乎不降低总速率的情况下，系统反馈极大降低
。 |
| 关键词: 多输入多输出 自适应传输 正交随机波束成形 信干比门限 |
| DOI： |
|
| 基金项目:国家自然科学基金资助项目（60802009） |
|
| An Adaptive Transmission Scheme for Multi-user MIMO Downlink Systems Based on SINR-threshold Feedback |
| LIN Hong-zhi,WANG De-sheng,YUE Kai |
| (Whuhan Optical-Electronics National Laboratory, Huazhong University of Scien
ce and Technology,Wuhan 430074，China) |
| Abstract: |
| A novel adaptive resource allocation scheme based on signal t
o interference plus noise ratios(SINR) threshold is proposed to reduce the system feedback
for MIMO downlink systems. Specially, based on orthonormal random beamforming(ORB
F), only when users maximum SINR is larger than SINR threshold,their maxim
um SINR and the index of beams are fed back to the base-station. And the relationship between
SINR threshold and sum-rate is given. Simulation results show that the proposed
scheme achieves greatly reduced feedback with almost the same sum-rate compared
with ORBF by the proper SINR threshold. |
| Key words: MIMO adaptive transmission orthonormal random beamforming SINR threshold |
《电讯技术》编辑部 