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1、基于空間分集增益的分布式快速空頻編碼算法 摘要:針對(duì)多點(diǎn)協(xié)作(CoMP)無(wú)線通信系統(tǒng)的下行傳輸問(wèn)題,提出一種分布式快速空頻編碼(DF?SFC)的方案。通過(guò)將小區(qū)邊緣用戶分組和分享相鄰小區(qū)間的子載波獲得空間分集增益,有效緩解了載波間干擾(ICI),基于此設(shè)計(jì)分布式解碼器,將用戶的解碼復(fù)雜度降低到相同的非分布式空頻編碼最佳解碼器的50%。通過(guò)將所提方案與Alamouti多點(diǎn)協(xié)作和非多點(diǎn)協(xié)作方案做比較,對(duì)用戶與其基站之間相對(duì)距離對(duì)比研究了可實(shí)現(xiàn)的傳輸速率,并且推斷出它的性能上限和下限,用于確立小區(qū)邊
2、緣用戶的閾值,實(shí)現(xiàn)在提出的多點(diǎn)協(xié)作和非多點(diǎn)協(xié)作模式之間切換,以提高整體性能。仿真結(jié)果表明,在服務(wù)小區(qū)邊緣用戶方面提出的方案均優(yōu)于Alamouti多點(diǎn)協(xié)作和非多點(diǎn)協(xié)作方案。 關(guān)鍵詞:協(xié)作多點(diǎn)傳輸;載波間干擾;空頻編碼;子載波分配 中圖分類號(hào):TN919.3+1?34;TP391文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1004?373X(2016)23?0029?05 Distributedfastspace?frequencyencodingalgorithmbasedonspacediversitygai
3、n CHANGBenchao1,WANGDan2,YANGXinfeng3,4 ?。?.InformationManagementCenter,HuangheJiaotongUniversity,Jiaozuo454950,China; 2.DepartmentofInformationEngineering,HuangheJiaotong7University,Jiaozuo454950,China; 3.SchoolofComputerScienceandTechnology,Wuha
4、nUniversityofTechnology,Wuhan430070,China; 4.CollegeofComputerandInformationEngineering,NanyangInstituteofTechnology,Nanyang473004,China) Abstract:Aimingatthedownlinktransmissionproblemofthecoordinatedmulti?point(CoMP)wirelesscommunicationsystem,ad
5、istributedfastspace?frequencycoding(DF?SFC)schemeispresented.Thecell?edgeusersaregroupedandthesub?carriersamongneighborcellsaresharedtoobtainthespacesubsetgain,soastoalleviatetheinter?carrierinterference(ICI).Indistributeddecoderdesignbasedonaboveste
6、p,theuserdecodingcomplexityisreducedby50%ofthesamenon?distributedspace?frequencycodingoptimaldecoder.TheproposedschemeiscomparedwithAlamoutimultipointcooperationandnon?multipointcooperationschemes.Theachievabletransmissionrateoftherelativedistanceamo
7、ngtheuseranditsbasestationisstudied.Theperformanceupperandlowerlimitsareinferredtodeterminethethresholdofthecelledgeusers,realizetheswitchingbetweentheproposedmultipointcooperationmodeandnon?multipointcooperationmode,andimprovetheoverallperformance.T
8、hesimulationresultsshowthattheproposedschemeissuperiortothe7Alamoutimultipointcooperationandnon?multipointcoo?perationschemesinserviceforthecelledgeusers. Keywords:coordinatedmulti?pointtransmission;inter?carrierinterference;space?frequencycoding;su