空间调制系统的星座优化设计
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摘要
作为一种新颖的多天线技术,空间调制(spatial modulation,SM)受到了学者的关注。近年来,SM系统的星座设计成为研究热点。然而现有的星座设计算法由于预先设定星座结构,导致不能得到最优的星座图。对此,在发送功率受限的条件下提出一种新的星座设计方案。该方案基于最小化SM系统误符号率(symbol error rate,SER)准则,通过扩大可行域范围并利用遗传算法,对SM系统的信号星座进行了优化。此外,深入分析了信号星座对SER及系统参数对星座设计的影响。仿真结果表明,该算法得到的星座图相比于其他星座图具有更好的SER性能。
Spatial modulation(SM)has attracted great attention of scholars as a novel multiple antenna technology.The optimal design for the constellation has been studied in recent years.However,since the structure of constellation diagram is predesigned,the existing algorithms are incapable of finding the optimal constellation diagram.For this reason,a new constellation design method is proposed under power constraint.The proposed method based on the minimized systems symbol error rate(SER)optimizes the constellation by expanding the feasible domain and by using the genetic algorithm.Furthermore,the influences of signal constellations on SER and of system parameters on the process of constellation design are analyzed.The simulation results indicate that constellations obtained by the proposed method are capable of offering a better SER performance compared with other constellations.
Spatial modulation(SM)has attracted great attention of scholars as a novel multiple antenna technology.The optimal design for the constellation has been studied in recent years.However,since the structure of constellation diagram is predesigned,the existing algorithms are incapable of finding the optimal constellation diagram.For this reason,a new constellation design method is proposed under power constraint.The proposed method based on the minimized systems symbol error rate(SER)optimizes the constellation by expanding the feasible domain and by using the genetic algorithm.Furthermore,the influences of signal constellations on SER and of system parameters on the process of constellation design are analyzed.The simulation results indicate that constellations obtained by the proposed method are capable of offering a better SER performance compared with other constellations.
引文
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[3]TSE D,VISWANATH P.Fundamentals of wireless communication[M].Cambridge,England:Cambridge University Press,2005.
[4]MESLEH R,HAAS H,SINANOVIC S,et al.Spatial modulation[J].IEEE Trans.on Vehicular Technology,2008,57(4):2228-2241.
[5]RENZO M D,HAAS H,GRANT P M.Spatial modulation for multiple-antenna wireless systems:a survey[J].IEEE Communications Surveys&Tutorials,2008,49(12):182-191.
[6]YANG P,RENZO M D,XIAO Y,et al.Design guidelines for spatial modulation[J].IEEE Communications Magazine,2015,17(1):6-26.
[7]BASAR E.Index modulation techniques for 5Gwireless networks[J].IEEE Communications Magazine,2016,54(7):168-175.
[8]AN Z,WANG J,WANG J,et al.Mutual information analysis on spatial modulation multiple antenna system[J].IEEE Trans.on Communications,2015,63(3):826-843.
[9]FAREGH E,ESLAMI M,HAGHIGHAT J.A closed-form mutual information approximation for multiple-antenna systems with spatial modulation[J].IEEE Wireless Communications Letters,2016,5(6):636-639.
[10]BASAR E,AYGOLU U,PANAYIRCI E,et al.Space-time block coded spatial modulation[J].IEEE Trans.on Communications,2011,59(3):823-832.
[11]RAJASHEKAR R,HARI K V S,HANZO L.Antenna selection in spatial modulation systems[J].IEEE Communications Letters,2013,17(3):521-524.
[12]ZHOU Z,GE N,LIN X.Reduced-complexity antenna selections schemes in spatial modulation[J].IEEE Communications Letters,2014,18(1):14-17.
[13]YANG P,XIAO Y,GUAN Y L,et al.Transmit antenna selection for multiple-input multiple-output spatial modulation systems[J].IEEE Trans.on Communications,2016,64(5):2035-2048.
[14]LEE M C,CHUNG W H,LEE T S.Generalized precoder design formulation and iterative algorithm for spatial modulation in MIMO systems with CSIT[J].IEEE Trans.on Communications,2015,63(4):1230-1244.
[15]CHENG P,CHEN Z,ZHANG J A,et al.A unified precoding scheme for generalized spatial modulation[J].IEEE Trans.on Communications,2018,66(6):2502-2514.
[16]YANG P,GUAN Y L,XIAO Y,et al.Transmit precoded spatial modulation:maximizing the minimum euclidean distance versus minimizing the bit error ratio[J].IEEE Trans.on Wireless Communications,2016,15(3):2054-2068.
[17]AHN Y,NOH H,LEE C.A Spatial modulation with spacephase constellation for spatially correlated channels[J].IEEECommunications Letters,2017,21(11):2396-2399.
[18]MASOUROS C,HANZO L.Constellation randomization achieves transmit diversity for single-RF spatial modulation[J].IEEETrans.on Vehicular Technology,2016,65(10):8101-8111.
[19]MASOUROS C,HANZO L.A scalable performance-complexity tradeoff for constellation randomization in spatial modulation[J].IEEE Trans.on Vehicular Technology,2017,66(3):2834-2838.
[20]MALEKI M,BAHRAMI H R,ALIZADEH A,et al.On the performance of spatial modulation:optimal constellation breakdown[J].IEEE Trans.on Communications,2014,62(1):144-157.
[21]RENZO M D,HAAS H.Bit error probability of SM-MIMOover generalized fading channels[J].IEEE Trans.on Vehicular Technology,2012,61(3):1124-1144.
[22]YANG P,XIAO Y,ZHANG S L,et al.Star-QAM signaling constellations for spatial modulation[J].IEEE Trans.on Vehicular Technology,2014,63(8):3741-3749.
[23]MALEKI M,BAHRAMI H R,ALIZADEH A.Constellation design for spatial modulation[C]∥Proc.of the IEEE International Conference on Communications,2015:2739-2743.
[24]ZHANG P,WANG C D,GUO S S,et al.Novel APM constellation design for spatial modulation systems[C]∥Proc.of the International Conference on Wireless Communications&Signal Processing,2015:1-5.
[25]FREUDENBERGER J,SHAVGULIDZE S.Signal constellations based on Eisenstein integers for generalized spatial modulation[J].IEEE Communications Letters,2017,21(3):556-559.
[26]HOLLAND J H.Adaptation in natural artificial systems[M].Cambridge,Massachusetts:MIT Press,1975.