基于S参数的共轭匹配MIMO系统注水容量研究
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摘要
大规模MIMO系统需要在有限的空间里采用多副天线,这将不可避免的引入耦合,耦合会影响MIMO系统性能。研究基于S参数的匹配网络MIMO系统注水容量。通过S参数网络模型,在传输端功率分配上引入注水定理,推导分析不同匹配条件下的容量闭合公式,通过Matlab对不同的接收端匹配条件下的容量进行仿真,包括:无耦合、自阻抗匹配和最优匹配几种情况。结果表明引入注水定理最大化传输端功率并且在接收端最佳共轭匹配的情况下,系统性能得到很大的改善和提高。
Large-scale MIMO systems need multiple antennas in a limited space, which will inevitably introduce coupling and will affect the performance of MIMO systems. This paper studies the Water-Pouring capacity of MIMO systems based on S-parameters. Through the S-parameter network model, the Water-Pouring Principle is introduced on the power distribution of the transmission end, and the capacity closure formula under different matching conditions is derived. The capacity under different matching conditions of the receiver is simulated by Matlab, including: no coupling, self-impedance matching, optimal matching. The results show that the introduction of the Water-Pouring Principle maximizes the power of the transmission end and the system performance is greatly improved under the condition of optimal conjugate matching at the receiving end.
Large-scale MIMO systems need multiple antennas in a limited space, which will inevitably introduce coupling and will affect the performance of MIMO systems. This paper studies the Water-Pouring capacity of MIMO systems based on S-parameters. Through the S-parameter network model, the Water-Pouring Principle is introduced on the power distribution of the transmission end, and the capacity closure formula under different matching conditions is derived. The capacity under different matching conditions of the receiver is simulated by Matlab, including: no coupling, self-impedance matching, optimal matching. The results show that the introduction of the Water-Pouring Principle maximizes the power of the transmission end and the system performance is greatly improved under the condition of optimal conjugate matching at the receiving end.
引文
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[7] JUNGNICKEL V,POHL V,VON HELMOLT C.Capacity of MIMO systems with closely spaced antennas[J].IEEE Communications Letters,2003,7(8):361-363.
[8] KRUSEVAC S M,KENNEDY R A,RAPAJIC P B.Effect of signal and noise mutual coupling on MIMO channel capacity[J].Wireless Personal Communications,2007,40(3):317-328.
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[10] BALANIS C A.Antenna theory:Analysis and design[M].New York:Harper&Row,1982.
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[12] ZHANG J,ZHU H B.Performance analysis on compact MIMO antenna arrays based on network theory[C] 2009 5th International Conference on Wireless Communications,Networking and Mobile Computing.IEEE,2009,2:1314-1318.
[13] ZHANG J,ZHU H B,CAI Y.Capacity analysis of compact MIMO system[C] 2009 15th Asia-Pacific Conference on Communications.IEEE Press,2009:1-5.
[14] LU S Y,HUI H T,BIALKOWSKI M E,et al.The effect of antenna mutual coupling on channel estimation of MIMO-OFDM systems[C] 2007 IEEE Antennas and Propagation Society International Symposium.IEEE,2007,6:2703-2706.
[15] WALLACE J W,JENSEN M A.Impact of antenna coupling on diversity performance:complete network theory analysis[C] IEEE International Conference on Communications.IEEE,2004,2:947-951.
[2] JANKIRAMAN M.Space-time codes and MIMO systems[M].Fitchburg:Artech House,2004.
[3] FEI Y Y,FAN Y J,LAU B K,et al.Optimal single-port matching impedance for capacity maximization in compact MIMO arrays[J].IEEE Transactions on Antennas & Propagation,2008,56(11):3566-3575.
[4] LAU,B K,ANDERSEN,J B,MOLISCH A,et al.Antenna matching for capacity maximization in compact MIMO systems[C].Wireless Communication Systems,2006 3rd International Symposium on.IEEE,2006:253-257.
[5] SVANTESSON T,RANHEIM A.Mutual coupling effects on the capacity of multielement antenna systems[C].IEEE International Conference on Acoustics,Speech,and Signal Processing,2001.Proceedings.IEEE,2001,4:2485-2488.
[6] JANASWAMY R.Effect of element mutual coupling on the capacity of fixed length linear arrays[J].IEEE Antennas & Wireless Propagation Letters,2002,1(1):157-160.
[7] JUNGNICKEL V,POHL V,VON HELMOLT C.Capacity of MIMO systems with closely spaced antennas[J].IEEE Communications Letters,2003,7(8):361-363.
[8] KRUSEVAC S M,KENNEDY R A,RAPAJIC P B.Effect of signal and noise mutual coupling on MIMO channel capacity[J].Wireless Personal Communications,2007,40(3):317-328.
[9] ANDERSEN J B,LAU B K.On closely coupled dipoles in a random field[J].IEEE Antennas & Wireless Propagation Letters,2006,5(1):73-75.
[10] BALANIS C A.Antenna theory:Analysis and design[M].New York:Harper&Row,1982.
[11] WALDSCHMIDT C,HAGEN J V,WIESBECK W.Influence and modelling of mutual coupling in MIMO and diversity systems[C] IEEE Antennas and Propagation Society International Symposium.IEEE,2002,3,190-193.
[12] ZHANG J,ZHU H B.Performance analysis on compact MIMO antenna arrays based on network theory[C] 2009 5th International Conference on Wireless Communications,Networking and Mobile Computing.IEEE,2009,2:1314-1318.
[13] ZHANG J,ZHU H B,CAI Y.Capacity analysis of compact MIMO system[C] 2009 15th Asia-Pacific Conference on Communications.IEEE Press,2009:1-5.
[14] LU S Y,HUI H T,BIALKOWSKI M E,et al.The effect of antenna mutual coupling on channel estimation of MIMO-OFDM systems[C] 2007 IEEE Antennas and Propagation Society International Symposium.IEEE,2007,6:2703-2706.
[15] WALLACE J W,JENSEN M A.Impact of antenna coupling on diversity performance:complete network theory analysis[C] IEEE International Conference on Communications.IEEE,2004,2:947-951.