第30卷第1期電子與信息學(xué)報Vol. 30No 12008年1月Journal of Electronics Information TechnologyJan.2008空分復(fù)用多輸入多輸出系統(tǒng)中的分組多用戶分集曾二林朱世華廖學(xué)文王君(西安交通大學(xué)電子與信息工程學(xué)院西安710049)摘要:該文針對基于空分復(fù)用的多用戶多輸入多輸出系統(tǒng)下行鏈路,研究了空間衰落相關(guān)和信道估計誤差對系統(tǒng)容量的影響,提出了兩種新的分組多用戶分集方案。所提出的方案通過合理選擇共道用戶,能有效提升系統(tǒng)容量,同時兼顧公平性。分析和仿真結(jié)果表明,所提出的方案對衰落相關(guān)性以及信道估計誤差具有較好的穩(wěn)健性;其中,第2種方案與第1種相比較,容量性能更優(yōu),但具有較高的計算復(fù)雜度關(guān)鍵詞:空分復(fù)用;多輸入多輸出;下行鏈路;多用戶分集圖分類號:TN914文獻標(biāo)識碼:A文章編號:1009-5896(2008)01-0081-05Grouped Multiuser Diversity for Spatial Multiplexing MIMO SystemsZhu Shi-hua Liao XIJun(School of Electronics and Information Engineering, Xi'an Jiaotong University, Xi'an 710049, China)Abstract: Focusing on the spatial multiplexing multiuser Multiple-Input Multiple-Output( MIMO)downlink,thispaper studies the influence of the spatial fading correlation and the channel estimation error on the system capacityTwo novel grouped multiuser diversity schemes are proposed. The proposed schemes can effectively increase thesystem capacity by rightly selecting the co-channel users, and can provide a good fairness performance. Bothanalysis and simulation results show that the schemes are robust for the fading correlation and channel estimationerrors. The second scheme can further increase the system capacity compared with the first one, but possesseshigher computational complexity.Key words: Spatial multiplexing; Multiple-Input Multiple-Output(MIMO); Downlink; Multiuser diversity1引言2系統(tǒng)模型及其描述多輸入多輸出(MMO)系統(tǒng)由于具有容量上的巨大優(yōu)21MM多用盧下行系統(tǒng)的描述勢,近年來受到廣泛關(guān)注。通信系統(tǒng)往往是多用戶系統(tǒng),所考慮一個MIMO多用戶下行系統(tǒng),基站天線數(shù)為M,以針對多用戶MIMO系統(tǒng)的研究是具有實際意義的。研究各用戶天線數(shù)均為N,且N