LTE虚拟MIMO系统中用户正交配对改进算法
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摘要
第三代合作伙伴计划(3GPP)在长期演进(LTE)上行传输中引入了虚拟多输入多输出(V-MIMO)技术,能够提升频谱效率,改善无线链路传输性能。用户配对是V-MIMO技术必不可少的环节。针对现有的正交配对算法由于不能准确衡量两用户的正交性而导致的性能恶化问题进行了理论分析,并提出更具有一般性的正交性定义。为适应LTE-Advanced上行最大支持4流、下行最大支持8流的特点,结合贪婪思想将正交配对的应用情形由两用户推广至多用户。为了进一步改善系统性能,提出基于范数的贪婪正交配对算法。仿真结果与复杂度分析表明,基于范数的贪婪正交配对算法与穷举的最优算法性能接近,且在计算复杂度上要远低于最优算法,对于V-MIMO技术的发展具有重要意义。
Virtual Multiple-Input Multiple-Output(V-MIMO),introduced by the 3rd Generation Partnership Project(3GPP),is a promising up-link technology that can improve the spectrum efficiency and performance of wireless transmission in Long Term Evolution(LTE) systems.The key technique of V-MIMO is the user pairing algorithm. In this paper,the existing orthogonal pairing scheme with undesirable performance due to its misjudgment of orthogonality between users is theoretically analyzed and a more general definition of orthogonality is proposed. As LTE-Advanced supports up to 4 data streams in up-link and 8 data streams in down-link,this paper presents the extension from 2 users pairing to multiple users pairing by using greedy strategy in orthogonal pairing algorithm. To further improve the performance while guaranteeing low complexity,a norm based orthogonal pairing algorithm using greedy strategy is proposed. Simulation results and complexity analysis show that this algorithm achieves comparable system performance to the optimal pairing scheme while possessing much lower complexity,which is of great significance for the development of V-MIMO technology.
Virtual Multiple-Input Multiple-Output(V-MIMO),introduced by the 3rd Generation Partnership Project(3GPP),is a promising up-link technology that can improve the spectrum efficiency and performance of wireless transmission in Long Term Evolution(LTE) systems.The key technique of V-MIMO is the user pairing algorithm. In this paper,the existing orthogonal pairing scheme with undesirable performance due to its misjudgment of orthogonality between users is theoretically analyzed and a more general definition of orthogonality is proposed. As LTE-Advanced supports up to 4 data streams in up-link and 8 data streams in down-link,this paper presents the extension from 2 users pairing to multiple users pairing by using greedy strategy in orthogonal pairing algorithm. To further improve the performance while guaranteeing low complexity,a norm based orthogonal pairing algorithm using greedy strategy is proposed. Simulation results and complexity analysis show that this algorithm achieves comparable system performance to the optimal pairing scheme while possessing much lower complexity,which is of great significance for the development of V-MIMO technology.
引文
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[2]CHEN X,HU H H,WANG H F,et al.Double proportional fair user pairing algorithm for uplink virtual MIMO systems[J].IEEE Transactions on Wireless Communications,2008,7(7):2425-2429.
[3]WU C L,LI C,GUO W.User pairing scheme with maximum stability region under Qo S constraints for uplink virtual MIMO networks[C]//Proceedings of 2013 IEEE/CIC International Conference on Communications in China.Xi'an:IEEE,2013:460-465.
[4]WANG X,WANG W,ZHU T,et al.Spatial multiuser pairing scheduling strategies for virtual MIMO systems[C]//Proceedings of 2008 IEEE Singapore International Conference on Communication Systems.Singapore:IEEE,2008:823-827.
[5]FAN B,WANG W B,LIN Y C.Spatial multi-user pairing for uplink virtual-MIMO systems with linear receiver[C]//Proceedings of 2009 IEEE Wireless Communications and Networking Conference(WCNC).Budapest,Hungary:IEEE,2009:1-5.
[6]ZHAO H Z,SONG M,LIU F W.A suboptimal multiuser pairing algorithm with low complexity for virtual MIMOsystems[J].IEEE Transactions on Vehicular Technology,2014,63(7):3481-3486.
[7]WANG L C,CHANG H W.A low-complexity uplink multiuser scheduling for virtual MIMO systems[J].IEEE Transactions on Vehicular Technology,2016,65(1):463-466.
[8]JAYETA B,NI W,LIU R P,et al.Low complexity user pairing and resource allocation of heterogeneous users for uplink virtual MIMO system over LTE-A network[C]//Proceedings of 2014 IEEE Wireless Communications and Networking Conference(WCNC).Istanbul,Turkey:IEEE,2014:1903-1908.
[9]ZHOU B,BAI B M,LI Y.Chordal distance-based user selection algorithm for the multiuser MIMO downlink with perfect or partial CSIT[C]//Proceedings of 2011 IEEEInternational Conference on Advanced Information Networking and Applications(AINA).Biopolis,Singapore:IEEE,2011:77-82.
[10]YAN Y Y,YUAN H Y,ZHENG N Z,et al.Performance of uplink multi-user MIMO in LTE-advanced networks[C]//Proceedings of 2012 International Symposium on Wireless Communication Systems(ISWCS).Paris,France:IEEE,2012:726-730.
[11]CONWAY J H,HARDIN R H,SLOANE N J A,et al.Packings in grassmannian space[J].Experimental Mathematics,1996,5(2):139-159.
[12]王靖,王秀梅,孙蔚.Rayleigh环境下MIMO系统容量分析[J].电讯技术,2009,49(12):9-14.WANG Jing,WANG Xiumei,SUN Wei.Capacity analysis of MIMO system in Rayleigh channels[J].Telecommunication Engineering,2009,49(12):9-14.(in Chinese)
[13]MICHAELA R,DANG U,WOLFGANG H G.User pairing for multiuser SC-FDMA transmission over virtual MIMO ISI channels[C]//Proceedings of 2009 IEEEConference on Global Telecommunications.Honolulu,Hawaii:IEEE,2009:1-7.
[14]丁锋.辨识方法的计算效率(2):迭代算法[J].南京信息工程大学学报(自然科学版),2012,4(5):385-401.DING Feng.Computational efficiency of the identification methods,part B:iterative algorithms[J].Journal of Nanjing University of Information Science&Technology(Natural Science Edition),2012,4(5):385-401.(in Chinese)
[15]ARIB.Spatial channel model for multiple input multiple output(MIMO)simulations:3GPP TR 25.996,v11.0.0.TSGRAN[S].Kasumigaseki,Tokyo:ARIB,2012.
[16]3GPP.Technical specification group radio access network;physical layer aspects for evolved universal terrestrial radio access(UTRA)(Release 7):3GPP TR 25.814.v7.1.0[S].[S.l.]:3GPP,2006.