{"title":"Multiuser diversity and adaptive bit loading for OFDM-based spectrum agile radios","authors":"P. Yaddanapudi, G. Raju, D. Popescu","doi":"10.1109/RWS.2008.4463443","DOIUrl":null,"url":null,"abstract":"In this paper we discuss exploiting multiuser diversity and adaptive modulation in conjunction with spectral load smoothing (SLS) as a medium access control protocol for spectrum agile radios (SAR) in a multiuser OFDM/OFDMA based wireless communication system operating in frequency selective fading channel. The ability of the spectrum agile radios to identify unused spectrum can be used effectively to assign sub- carriers and bits adaptively depending on the user's channel state information in a distributed fashion. We illustrate by simulation the performance improvement in terms of the bit error rate obtained for a multiuser OFDM system when multiuser diversity and adaptive bit loading is used in combination with SLS.","PeriodicalId":431471,"journal":{"name":"2008 IEEE Radio and Wireless Symposium","volume":"18 22","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2008-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2008 IEEE Radio and Wireless Symposium","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/RWS.2008.4463443","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
In this paper we discuss exploiting multiuser diversity and adaptive modulation in conjunction with spectral load smoothing (SLS) as a medium access control protocol for spectrum agile radios (SAR) in a multiuser OFDM/OFDMA based wireless communication system operating in frequency selective fading channel. The ability of the spectrum agile radios to identify unused spectrum can be used effectively to assign sub- carriers and bits adaptively depending on the user's channel state information in a distributed fashion. We illustrate by simulation the performance improvement in terms of the bit error rate obtained for a multiuser OFDM system when multiuser diversity and adaptive bit loading is used in combination with SLS.
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