在LTE-A(long term evolution advanced)标准中,基于固定码本的双码本传输模式已经开始使用。为了进一步降低信道的量化误差,在保证反馈开销的前提下提高多入多出(multiple-input multiple-output,MIMO)系统的整体性能,提出一种基于格...在LTE-A(long term evolution advanced)标准中,基于固定码本的双码本传输模式已经开始使用。为了进一步降低信道的量化误差,在保证反馈开销的前提下提高多入多出(multiple-input multiple-output,MIMO)系统的整体性能,提出一种基于格来斯曼码本的差分设计方法,该方法利用信道的时间相关性和空间相关性,定时旋转和缩放两级双码本以更好地追踪信道特性。展开更多
研究了多输入多输出广播通信(MI MO BC)系统中的信道量化反馈问题.通过分析得到了一个接收用户容量上界,并基于该上界最大化构造了一种新的量化反馈方法.该方法采用随机量化码本,不仅考虑了信道的方向还考虑了子信道增益信息.仿真结果表...研究了多输入多输出广播通信(MI MO BC)系统中的信道量化反馈问题.通过分析得到了一个接收用户容量上界,并基于该上界最大化构造了一种新的量化反馈方法.该方法采用随机量化码本,不仅考虑了信道的方向还考虑了子信道增益信息.仿真结果表明,相对只量化反馈信道方向信息的方法,该方法不仅显著提高了量化误差存在下的系统容量,并且复杂度更低.展开更多
The discrete Fourier transform （DFT）-based codebook is employed in this paper to quantize channel state information so that the amount of feedback can be reduced in the multiple input multiple output （MIMO） downli...The discrete Fourier transform （DFT）-based codebook is employed in this paper to quantize channel state information so that the amount of feedback can be reduced in the multiple input multiple output （MIMO） downlink of long term evolution （LTE） system. And a novel beamforming （BF） scheme based on the proposed channel quality-to-interference （QIR） quantizing criteria is developed, which uses only the index of the optimal codebook for the beamforming at the base station （BS）, and dramatically reduces the amount of feedback. The proposed BF scheme jointly considers the influences of the quality of the quantized channels and the mutual interference among the sub-channels. The extensive simulation results verify that throughput of the proposed BF scheme is better than that of the random BF with a little feedback, and that of the eigen-beamforming even under low signal noise ratio （SNR） scenario.展开更多
文摘在LTE-A(long term evolution advanced)标准中,基于固定码本的双码本传输模式已经开始使用。为了进一步降低信道的量化误差,在保证反馈开销的前提下提高多入多出(multiple-input multiple-output,MIMO)系统的整体性能,提出一种基于格来斯曼码本的差分设计方法,该方法利用信道的时间相关性和空间相关性,定时旋转和缩放两级双码本以更好地追踪信道特性。
文摘研究了多输入多输出广播通信(MI MO BC)系统中的信道量化反馈问题.通过分析得到了一个接收用户容量上界,并基于该上界最大化构造了一种新的量化反馈方法.该方法采用随机量化码本,不仅考虑了信道的方向还考虑了子信道增益信息.仿真结果表明,相对只量化反馈信道方向信息的方法,该方法不仅显著提高了量化误差存在下的系统容量,并且复杂度更低.
基金supported by the Program for New Century Excellent Talents in University (NCET-08-0891)the Research Fund for the Doctoral Program of Higher Education of China(20070532077)the Natural Science Foundation of Shaanxi Province (2010JQ80241, 1090275)
文摘The discrete Fourier transform （DFT）-based codebook is employed in this paper to quantize channel state information so that the amount of feedback can be reduced in the multiple input multiple output （MIMO） downlink of long term evolution （LTE） system. And a novel beamforming （BF） scheme based on the proposed channel quality-to-interference （QIR） quantizing criteria is developed, which uses only the index of the optimal codebook for the beamforming at the base station （BS）, and dramatically reduces the amount of feedback. The proposed BF scheme jointly considers the influences of the quality of the quantized channels and the mutual interference among the sub-channels. The extensive simulation results verify that throughput of the proposed BF scheme is better than that of the random BF with a little feedback, and that of the eigen-beamforming even under low signal noise ratio （SNR） scenario.
