Maximizing spectral efficiency with imperfect channel information in high mobility systems
Maximizing spectral efficiency with imperfect channel information in high mobility systems
复制标题
DOI：
10.1109/glocom.2013.6831591
复制
发表时间：
2013-12
期刊：
影响因子：
--
通讯作者：
Ning Sun;Jingxian Wu
中科院分区：
文献类型：
--
作者：
Ning Sun;Jingxian Wu
本文研究了优化系统设计，可以最大限度地提高具有不完善信道状态信息（CSI）的高移动性无线通信系统的频谱效率。在高移动性系统中，传输符号中导频符号的百分比对系统性能起着至关重要的作用：较高的导频百分比会产生更准确的信道估计，但代价是更多的开销。通过渐近分析将信道估计均方误差量化为导频百分比的封闭式表达式。研究了导频位置处的估计和非导频位置处的信道内插的效果。然后，结果用于导出使用不完美 CSI 运行的系统的分析频谱效率下限。频谱效率下界被表示为导频百分比、最大多普勒扩展和信噪比等多个参数的显式函数。通过分析确定了可以最大化频谱效率下界的最佳导频百分比，并通过分析和仿真结果研究了不完善的CSI对系统性能的影响。
This paper studies the optimum system design that can maximize the spectral efficiency of a high mobility wireless communication system with imperfect channel state information (CSI). In a high mobility system, the percentage of pilot symbols in the transmitted symbols plays a critical role on system performance: a higher pilot percentage yields a more accurate channel estimation at the cost of more overhead. The channel estimation mean square error is quantified as a closed-form expression of the pilot percentage through asymptotic analysis. The effects of both estimation at pilot locations and channel interpolation at non-pilot locations are studied. The results are then used to derive an analytical spectral efficiency lower bound for systems operating with imperfect CSI. The spectral efficiency lower bound is expressed as an explicit function of a number of parameters, such as pilot percentage, maximum Doppler spread, and the signal-to-noise ratio, etc. The optimum pilot percentage that can maximize the spectral efficiency lower bound is analytically identified, and the impacts of imperfect CSI on system performance are studied through both analytical and simulation results.