大尺度信干比共享下的基站协作干扰协调
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摘要
在基于正交频分多址接入(OFDMA)技术的蜂窝移动小区中,小区间的干扰是影响系统性能的主要因素。多点协调(CoMP)技术被视为能够协调小区间干扰的主要手段。在下行多点协作传输系统中,小区基站采用三向天线来对小区划分扇区,从而消除了相邻小区边缘处的干扰。各扇区分别计算扇区内用户的大尺度信干比(SIR),小区之间通过共享大尺度信干比信息,对各自服务的用户按照一定的规则进行匹配,对小区中心用户的SIR和边缘用户的SIR进行了折中,从而有效解决小区边缘用户由于小区间干扰带来的低信干噪比(SINR)问题。仿真结果表明,本文提出的用户匹配算法以较小的反馈开销,较大地提高了小区边缘用户的信干噪比和系统吞吐量。
In the Orthogonal Frequency Division Multiple Access(OFDMA) cellular mobile communication systems,Inter-cell interference(ICI) become the main factor in affecting system performance.Coordinated Multipoint(CoMP) is one of the key technologies in dealing with the interference coordination.In downlink coordinated multi-point transmission systems,base-stations(BS) adopt tri-sector antenna divide the cell into three fan sectors so that the interference between the neighborhood cellulars can be greatly dispelled.Base-stations computes the large scale Signal to Interference Ratio(SIR) for the served users,and cell match its users with ones in the other cells according to certain rules by sharing the large scale SIR information.It realizes a trade-off of SIR between the users in the center of the cellular and users on the edge of the cellular,in order to solve the low Signal to Interference plus Noise Ratio(SINR) problem which due to the ICI at cell edge.Simulation results show that the proposed algorithm significantly improves cell edge SINR and throughput with less feedback overhead.
In the Orthogonal Frequency Division Multiple Access(OFDMA) cellular mobile communication systems,Inter-cell interference(ICI) become the main factor in affecting system performance.Coordinated Multipoint(CoMP) is one of the key technologies in dealing with the interference coordination.In downlink coordinated multi-point transmission systems,base-stations(BS) adopt tri-sector antenna divide the cell into three fan sectors so that the interference between the neighborhood cellulars can be greatly dispelled.Base-stations computes the large scale Signal to Interference Ratio(SIR) for the served users,and cell match its users with ones in the other cells according to certain rules by sharing the large scale SIR information.It realizes a trade-off of SIR between the users in the center of the cellular and users on the edge of the cellular,in order to solve the low Signal to Interference plus Noise Ratio(SINR) problem which due to the ICI at cell edge.Simulation results show that the proposed algorithm significantly improves cell edge SINR and throughput with less feedback overhead.
引文
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[3]Zhang Q and Yang C Y.Semi-Dynamic Mode Selection inBase Station Cooperative Transmission System[C].2011 IEEE Vehicular Technology Conference(VTCFall),2011:1-5.
[4]Wang L C.3-Cell Network MIMO Architectures with Sec-torization and Fractional Frequency Reuse[J].IEEEJournal on Selected Areas in Communications.2011.29(6):1185-1199.
[5]Zeng Y,Gunawan E,and Guan Y L.Distributed powerallocation for network MIMO with a Bayesian game-the-oretic approach[C].International Conference on Infor-mation,Communications and Signal Processing(ICICS),2011:1-5.
[6]Geirhofer S.,Oyman O.Cooperative Fraction FrequencyReuse Based on Partial Connectivity Among Clients[C].IEEE GLOBECOM Proceedings.2008:1-5.
[7]Yoo T.,and Goldsmith A.On the optimality of multi-an-tenna broadcast scheduling using zero-forcingbeamforming[J].IEEE J.Select.Areas Commun.,2006,24(3):528-541.
[8]N.Jindal.MIMO broadcast channels with finite-rate feed-back[J].IEEE Trans.Inf.Theory,2006,52(3):5045-5060.
[9]Dimic.G and Sidiropoulos.N.D.On downlinkbeamforming with greedy user selection:performance a-nalysis and a simple new algorithm[J].IEEE Trans.Signal Processing,2005,53(10):3857-3868.
[10]Zhang Q,Yang C Y.Downlink transmission mode selec-tion in Cooperative systems considering training overheads[C].Proc.IEEE VTC spring,2011:1-5.
[11]3GPP TR 36.814 v9.0.0.(2010,Mar.)Evolved uni-versal terrestrial radio access(E-UTRA);further ad-vancements for E-UTRA physical layer aspects(Release9).
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[13]Karakayali M.K,Foschini G.J.,Valenzuela R.A.Onthe Maximum Common Rate Achievable in a CoordinatedNetwork[C].Proc of ICC.2006:4333-4338.