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可重构智能表面(Reconfigurable Intelligent Surface, RIS)由于可以智能控制传输环境，动态改变反射信号的幅度相位，有效增强无线通信性能，引起了广泛关注。为了使RIS和中继各取所长，在独立不同分布的Nakagami-m衰落信道下，考虑了多个RIS选择最优进行辅助的解码转发协作中继通信系统。在RIS最优选择方案中，不考虑基站到用户的直射链路，仅对RIS参与反射的链路进行最优选择。推导RIS选优方案下系统中断概率和遍历速率的闭式表达式，并基于这些表达式进行性能分析。蒙特卡罗仿真验证了推导公式的正确性。仿真结果表明，在中断概率和遍历速率方面，RIS选优方案相比只有中继或只有RIS辅助下传输方案性能更好。
Abstract：Reconfigurable Intelligent Surface(RIS) has attracted extensive attention because it can intelligently control the transmission environment, dynamically change the amplitude and phase of reflected signals, and effectively enhance the performance of wireless communication.In order to make RIS and relay have their own advantages, in Nakagami-m fading channels with independent and different distribution, multiple RISs are considered to select the optimal decoding and forwarding cooperative relay communication system for assistance.In the RIS optimal selection scheme, the direct link from the base station to the user is not considered, and only the link in which RIS participates in reflection is optimally selected.The closed form expressions of system outage probability and ergodic rate under RIS optimization scheme are derived, and the performance is analyzed based on these expressions.Monte Carlo simulation verifies the correctness of the derived formula.The simulation results show that in terms of outage probability and ergodic rate, the RIS optimization scheme has better performance than the transmission scheme with only relay or RIS assistance.
[1] YOU X H,WANG C X,HUANG J,et al.Towards 6G Wireless Communication Networks:Vision,Enabling Technologies,and New Paradigm Shifts[J].Science China (Information Sciences),2021,64(1):5-78.
[2] DI B,ZHANG H L,SONG L Y,et al.Hybrid Beamforming for Reconfigurable Intelligent Surface Based Multi-user Communications:Achievable Rates with Limited Discrete Phase Shifts[J].IEEE Journal on Selected Areas in Communications,2020,38(8):1809-1822.
[3] REZAEI A,KHALILI A,JALALI J,et al.Energy-efficient Resource Allocation and Antenna Selection for IRS-assisted Multi-cell Downlink Networks[J].IEEE Wireless Communications Letters,2022,11(6):1229-1233.
[4] PAN C,REN H,WANG K,et al.Multicell MIMO Communications Relying on Intelligent Reflecting Surface[J].IEEE Transactions on Wireless Communications,2020,19(8):5218-5233.
[5] CUI M,ZHANG G,ZHANG R.Secure Wireless Communication via Intelligent Reflecting Surface[J].IEEE Wireless Communication Letters,2019,8(5):1410-1414.
[6] WANG P,FANG J,YUAN X,et al.Intelligent Reflecting Surface-assisted Millimeter Wave Communications:Joint Active and Passive Precoding Design[J].IEEE Transactions on Vehicular Technology,2020,69(12):14960-14973.
[7] WU Q,ZHANG R.Intelligent Reflecting Surface Enhanced Wireless Network via Joint Active and Passive Beamforming[J].IEEE Transactions on Wireless Communications,2019,18(11):5394-5409.
[8] HUANG C,ZAPPONE A,ALEXANDROPOULOS G C,et al.Reconfigurable Intelligent Surfaces for Energy Efficiency in Wireless Communication[J].IEEE Transactions on Wireless Communications,2019,18(8):4157-4170.
[9] BJ?RNSON E,SANGUINETTI L.Power Scaling Laws and Near-field Behaviors of Massive MIMO and Intelligent Reflecting Surfaces[J].IEEE Open Journal of the Communications Society,2020,1:1306-1324.
[10] NTONTIN K,RENZO M D,SONG J,et al.Reconfigurable Intelligent Surfaces vs.Relaying:Differences,Similarities,and Performance Comparison[J].IEEE Open Journal of the Communication Society,2020,1:798-807.
[11] YANG L,YANG Y,COSTA D B D,et al.Outage Probability and Capacity Scaling Law of Multiple RIS-aided Cooperative Networks[J].IEEE Wireless Communications Letters,2021,10(2):256-260.
[12] DO T N,KADDOUM G,LUAN N T,et al.Multi-RIS-aided Wireless Systems:Statistical Characterization and Performance Analysis[J].IEEE Transactions on Communications,2021,69(12):8647-8658.
[13] PEEBLES P Z.Probability,Random Variables,and Random Signal Principles[M].New York:McGraw-Hill Book Co.,2000.
[14] ATAPATTU S,FAN R,DHARMAWANSA P,et al.Reconfigurable Intelligent Surface Assisted Two-way Communications:Performance Analysis and Optimization[J].IEEE Transactions on Communications,2020,68(10):6552-6567.
[15] GRADSHTEYN I S,RYZHIK I M,JEFFREY A,et al.Table of Integrals,Series,and Products[J].Journal of Biomechanical Engineering,1981,103(1):58.
[16] PHAN V D,NGUYEN B C,HOANG T M,et al.Performance of Cooperative Communication System with Multiple Reconfigurable Intelligent Surfaces over Nakagami-m Fading Channels[J].IEEE Access,2022,10:9806-9816.
[17] YANG L,LI P,YANG Y,et al.Performance Analysis of RIS-aided Networks with Co-channel Interference[J].IEEE Communications Letters,2022,26(1):49-53.
[18] BOULOGEORGOS A A A,ALEXIOU A.Performance Analysis of Reconfigurable Intelligent Surface-assisted Wireless Systems and Comparison with Relaying[J].IEEE Access,2020,8:94463-94483.
[19] YILDIRIM I,UYRUS A,BASAR E.Modeling and Analysis of Reconfigurable Intelligent Surfaces for Indoor and Outdoor Applications in Future Wireless Networks[J].IEEE Transactions on Communications,2021,69(2):1290-1301.
[20] BJ?RNSON E,?ZDOGAN ?,LARSSON E G.Intelligent Reflecting Surface Versus Decode-and-Forward:How Large Surfaces are Needed to Beat Relaying?[J].IEEE Wireless Communications Letters,2020,9(2):244-248.
[21] WU Q,ZHANG S,ZHENG B,et al.Intelligent Reflecting Surface-aided Wireless Communications:A Tutorial[J].IEEE Transactions on Communications,2021,69(5):3313-3351.
基本信息:
DOI：
中图分类号:TN925
引用信息:
[1]任静,岳殿武,陈迎新等.RIS选优辅助的协作中继通信系统性能研究[J].无线电工程,2022,52(12):2156-2162.
基金信息:
国家自然科学基金(61971081); 毫米波国家重点实验室开放课题基金资助项目(K202208)~~