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基于随机波束成形MIMO系统的信道反馈算法

Channel Feedback Algorithms Based on Opportunistic Beamforming MIMO Systems
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摘要 MIMO系统是未来移动通信发展的趋势。随机波束成形利用包含信道质量的反馈信息,可以开发多用户分集增益,进一步提高MIMO系统的容量。然而繁重的反馈信息会占据大量的无线资源,降低系统的实际效率。主要研究降低随机波束成形MIMO系统反馈开销的方法,提出了两种部分信道反馈算法:门限反馈和最优反馈。理论推导表明了系统平均容量与反馈率之间的权衡关系,仿真结果证明了只要恰当地选取反馈参数,这两种反馈算法可以在几乎不牺牲系统容量的前提下,极大节省反馈开销。其中,门限反馈在系统容量方面表现要好于最优反馈,而最优反馈在实现简便性方面要强于门限反馈,因此实际设计时要折中考虑。 MIMO is one of the most important techniques in the future wireless communication systems. Opportunistic beamforming can significantly improve the performance of MIMO systems by exploiting the feedback information that conveys the channel quality. But, the feedback information expenses a substantial amount of wireless resource and decreases system efficiency. To save the feedback load, two partial feedback algorithms were proposed and named threshold feedback and best feedback respectively. The theory expression explains the relationship of system average capability and feedback ratio. The simulation results prove that the proposed partial feedback algorithms can reduce the feedback overload greatly without sacrificing the system capability, only if the feedback parameters are chosen properly. Wherein, threshold feedback is better than best feedback in the aspect of system capability, but best feedback is simpler in practicality. Therefore,the tradeoff is considered in process of practical design.
出处 《计算机科学》 CSCD 北大核心 2009年第5期85-87,95,共4页 Computer Science
基金 国际科技合作项目(2008DFA11630) 国家自然科学基金项目(60496315) 国家高技术研究发展计划("863"计(2006AA01Z277)资助
关键词 随机波束成形 MIMO 信道反馈 Opportunistic beamforming, MIMO, Channel feedback
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参考文献5

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