Reducing feedback load for proportional fair scheduling in MIMO OFDM systems

2012 Computing, Communications and Applications Conference Pub Date : 2012-02-21 DOI:10.1109/COMCOMAP.2012.6154881

Wenxiu Zhao, Tiankui Zhang, Zhimin Zeng, Weidong Ning, Y. Ngok, Ruyue Li

{"title":"Reducing feedback load for proportional fair scheduling in MIMO OFDM systems","authors":"Wenxiu Zhao, Tiankui Zhang, Zhimin Zeng, Weidong Ning, Y. Ngok, Ruyue Li","doi":"10.1109/COMCOMAP.2012.6154881","DOIUrl":null,"url":null,"abstract":"A feedback reduction scheme is proposed in multi-input multi-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. The proposed scheme can reduce the feedback load of channel quality indicator (CQI) required for proportional fair scheduling at base station (BS). The probability distributions of instantaneous rate and average rate are studied. Then the distribution of proportional fair (PF) priority is obtained. Each user predicts the probability of being scheduled on the condition that its own PF priority is known. To reduce the amount of feedback load, a hard threshold of PF probability is designed for the CQI feedback reduction. This threshold is broadcast to all the users and only the users whose instantaneous PF priorities are higher than the threshold will feed back the CQI. The amount of feedback load saved by implementing the hard threshold is determined and the effect on the system throughput is analyzed. The simulation results show that the proposed scheme can reduce the feedback overhead while minimize the throughput loss.","PeriodicalId":281865,"journal":{"name":"2012 Computing, Communications and Applications Conference","volume":"22 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2012-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2012 Computing, Communications and Applications Conference","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/COMCOMAP.2012.6154881","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}

引用次数: 1

Abstract

A feedback reduction scheme is proposed in multi-input multi-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. The proposed scheme can reduce the feedback load of channel quality indicator (CQI) required for proportional fair scheduling at base station (BS). The probability distributions of instantaneous rate and average rate are studied. Then the distribution of proportional fair (PF) priority is obtained. Each user predicts the probability of being scheduled on the condition that its own PF priority is known. To reduce the amount of feedback load, a hard threshold of PF probability is designed for the CQI feedback reduction. This threshold is broadcast to all the users and only the users whose instantaneous PF priorities are higher than the threshold will feed back the CQI. The amount of feedback load saved by implementing the hard threshold is determined and the effect on the system throughput is analyzed. The simulation results show that the proposed scheme can reduce the feedback overhead while minimize the throughput loss.

查看原文本刊更多论文

MIMO OFDM系统中减少反馈负载的比例公平调度

针对多输入多输出(MIMO)正交频分复用(OFDM)系统，提出了一种反馈抑制方案。该方案可以减少基站比例公平调度所需的信道质量指标(CQI)的反馈负荷。研究了瞬时速率和平均速率的概率分布。然后得到比例公平(PF)优先级的分布。每个用户在自己的PF优先级已知的情况下预测被调度的概率。为了减少反馈负载量，设计了PF概率的硬阈值来减少CQI反馈。该阈值将广播给所有用户，只有瞬时PF优先级高于该阈值的用户才会反馈CQI。确定了实现硬阈值所节省的反馈负载量，并分析了硬阈值对系统吞吐量的影响。仿真结果表明，该方案在减少反馈开销的同时，使吞吐量损失最小化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

2012 Computing, Communications and Applications Conference

自引率

0.00%

发文量