| 摘要: |
| 针对实际MIMO系统无线信道存在的空域相关性，提出了一种基于
相关信道统计的改进算法。基于此算法，并采用随机码本量化信道信息形成一种新波束形成
方案，它只需要有限速率反馈部分信道信息，可以同时获得系统多用户分集增益和阵列增益
，解决了常规波束形成需要大量信道反馈信息和相干波束形成系统性能对信道瞬时变化信息
敏感的问题。仿真结果表明，提出方案在相关信道下相当有效，其性能超过常规波束形成，
即使在有限反馈限制条件下，其性能亦接近相干机会波束的性能，仅有0.2 bit/s·Hz
-1的性能损失。 |
| 关键词: 多输入多输出 随机码本量化 波束形成 多用户分集 特征值
分解 |
| DOI： |
|
| 基金项目:国家自然科学基金资助项目(60602053)；教育部“新世纪优秀人
才支持计划”项目（NCET-08-0891）；高等学校博士学科点专项科研基金项目（2007053207
7）;湖北省自然科学基金资助项目（2009CDB308）;陕西省自然科学基金资助项目（2010JQ8
0241）;教育部科学技术研究重点项目 |
|
| Finite Rate Feedback Beamforming Based on Statistics of Correlation Channels |
| SUN Bao-yu,LU Guang-yue |
| (Telecommunication and Information Engineering College, Xi′an University of Posts and Telecommunications, Xi′an 710061,China;Telecommunication and Information Engineering College, Xi′an University of Posts and Telecommunications, Xi′an 710061,China;Electronics and Information College, Yangtze University, Jingzhou 434023,Ch
ina) |
| Abstract: |
| Due to the spatial correlation of the real MIMO（Multiple-Input Multiple-Output
） channels, an improved
finiterate feedback beamforming algorithm based on the correlation channel sta
t
istic is proposed by the use of random vector codebook to quantize the channel s
tate information. The novel beamforming scheme only needs limited feedback chann
el state information and can exploit multiuser diversity gain and array gain s
i
multaneously. Superior to the conventional beamforming and coherent opportunisti
c beamforming, the novel beamforming is neither in need of lots of feedback info
rmation nor sensitive to instantaneous change of channel. The simulation results
show that the performance of the proposed scheme is better than that of the con
ventional beamforming and approximates to that of coherent beamforming with only
0.2 bit/s·Hz-1 performance loss. |
| Key words: MIMO random vector quantization(RVQ) beamforming multiuser diversity eigen va
lue decomposition |
《电讯技术》编辑部 