Research of channel quantization and feedback strategies based on multiuser diversity MIMO-OFDM systems

LIANG Xue-jun; ZHU Guang-xi; SU Gang; WANG De-sheng

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Research of channel quantization and feedback strategies based on multiuser diversity MIMO-OFDM systems

更新时间：2024-10-14

- Research of channel quantization and feedback strategies based on multiuser diversity MIMO-OFDM systems
- Vol. 30, Issue 9, Pages: 36-42(2009)
- 作者机构：
  
  华中科技大学电子与信息工程系
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN919.3
- Published：2009
- 稿件说明：
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LIANG Xue-jun, ZHU Guang-xi, SU Gang, et al. Research of channel quantization and feedback strategies based on multiuser diversity MIMO-OFDM systems[J]. 2009, 30(9): 36-42.
DOI：

LIANG Xue-jun, ZHU Guang-xi, SU Gang, et al. Research of channel quantization and feedback strategies based on multiuser diversity MIMO-OFDM systems[J]. 2009, 30(9): 36-42. DOI：

摘要

提出了一种以CQI量化值表示调制方式的量化方法

与理想状态相比较

证明了其在平均频谱效率方面的无损性。接着将该量化方法与3种部分反馈策略(门限反馈、最优反馈和混合反馈)相结合

推导了各自情形下系统平均频谱效率的数学表达式。最后从反馈信道容量和容量相对损失2个不同的角度考虑

给出了确定最佳反馈参数的方案。仿真用于评估各种算法的性能

其结果与理论分析相当匹配

并且只要恰当地选取反馈参数

部分量化反馈算法可以在相同的系统性能要求下

极大地降低反馈开销。其中尤以混合算法表现最好

可为设计实际系统的信道反馈提供参考。

Abstract

Firstly

a quantization method was proposed by quantized value indicating the modulation level instead of the full values of channel quality information（CQI） and the achievable average spectrum efficiency showed no loss compared with perfect case.Secondly

employment of the integrated design that combined with opportunistic

best

and hybrid feedback scheme was considered and the close-form expression of average spectrum efficiency was deduced in various case.Finally

the calculation of optimal feedback parameters was confirmed from two aspects of feedback channel capacity and capacity relative loss.Extensive simulations were presented to evaluate these proposed strategies.The results match with the numeral analysis very well.The proposed partial feedback schemes can reduce the feedback load greatly with the same system capability

only if the feedback parameters be chosen properly.Wherein

the hybrid feedback combined with quantization performs best and provides the instruction to design the channel feedback of practical systems.

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