To minimize the outage probability of the cell （OPC） in downlink distributed antenna systems with selection transmission, a complex-encoding genetic algorithm （GA） is proposed to find the optimal locations of the ...To minimize the outage probability of the cell （OPC） in downlink distributed antenna systems with selection transmission, a complex-encoding genetic algorithm （GA） is proposed to find the optimal locations of the antenna elements （AEs）. First, the outage probability at a fixed location in the cell is investigated. Next, an analytical expression of the OPC is derived, which is a function of the AE locations. Then the OPC is used as the objective function of the antenna placement optimization problem, and the complex- encoding GA is used to find the optimal AE locations in the cell. Numerical results show that the optimal AE locations are symmetric about the cell center, and the outage probability contours are also given with the optimal antenna placement. The algorithm has a good convergence and can also be used to determine the number of AEs which should be installed in order to satisfy the certain OPC value. Lastly, verification of the OPC＇s analytical expression is carried out by Monte Carlo simulations. The OPC with optimal AE locations is about 10% lower than the values with completely random located AEs.展开更多
This paper aims to examine the architecture design of a distributed antenna based Gbps wireless communication system using the high frequency band.In order to analyze the feasibility of the higher frequency band appli...This paper aims to examine the architecture design of a distributed antenna based Gbps wireless communication system using the high frequency band.In order to analyze the feasibility of the higher frequency band applications,the cumulative distribution of simulated user throughput in a cellular is investigated firstly.It shows that capacity improvement can be obtained using higher operating frequency band,especially in hotspot scenarios.Secondly,the architecture of the distributed antenna system(DAS) is introduced to overcome the disadvantages of weak coverage and rank deficient for the traditional multiple-input multiple-output(MIMO) systems using higher frequency bands in line-of-sight(LOS)environments.In addition,a software-defined-radio(SDR) based Gbps wireless transmission system with scalable hardware architecture is designed and implemented.Finally,a demo of outdoor DAS coverage for high data throughput application is given.Field trials show that 1 Gbps data rate and a large coverage in outdoor environments can be achieved over 6.05 GHz.It is proved that the Gbps DAS system at a higher frequency band can be a successful model for future wireless broadband coverage in hotspot scenarios.展开更多
正确选择小区内部的分布式天线模块可以提高覆盖区的通信质量,如果各分布式天线模块之间没有能量协作,也即每个天线模块都有自己的功率限制,那么天线模块的覆盖范围会小于只有和功率限制的天线模块的覆盖范围.综合考虑分布式天线模块选...正确选择小区内部的分布式天线模块可以提高覆盖区的通信质量,如果各分布式天线模块之间没有能量协作,也即每个天线模块都有自己的功率限制,那么天线模块的覆盖范围会小于只有和功率限制的天线模块的覆盖范围.综合考虑分布式天线模块选择和天线模块的功率限制,提出了一种正三角形小区通信系统(triangular cellular communication system,TCCS)和相应的下行功率控制策略.基于多小区环境和单用户系统的假设,研究了TCCS的中断容量.仿真实验表明,TCCS在小区的不同部分都具有平坦的容量分布.实验数值分析进一步说明,即使各天线模块都有功率限制,TCCS仍然可以增大覆盖面积,并且TCCS的容量高于使用传统分布式功控策略系统.展开更多
基金supported by the National Science and Technology Major Project: the Next Generation Wireless Mobile Communication Network (2009ZX03004-001)
文摘To minimize the outage probability of the cell （OPC） in downlink distributed antenna systems with selection transmission, a complex-encoding genetic algorithm （GA） is proposed to find the optimal locations of the antenna elements （AEs）. First, the outage probability at a fixed location in the cell is investigated. Next, an analytical expression of the OPC is derived, which is a function of the AE locations. Then the OPC is used as the objective function of the antenna placement optimization problem, and the complex- encoding GA is used to find the optimal AE locations in the cell. Numerical results show that the optimal AE locations are symmetric about the cell center, and the outage probability contours are also given with the optimal antenna placement. The algorithm has a good convergence and can also be used to determine the number of AEs which should be installed in order to satisfy the certain OPC value. Lastly, verification of the OPC＇s analytical expression is carried out by Monte Carlo simulations. The OPC with optimal AE locations is about 10% lower than the values with completely random located AEs.
基金supported in part by the National Natural Science Foundation of China(No.61402044)863 plan program of China(No.2015AA01 A706)+2 种基金Science Foundation of Beijing Education Commission(No.KM201511232011)Science Fundation of Beijing Information Science & Technology University(No.5211524100)Beijing Nova Program(No.Z161100004916086)
文摘This paper aims to examine the architecture design of a distributed antenna based Gbps wireless communication system using the high frequency band.In order to analyze the feasibility of the higher frequency band applications,the cumulative distribution of simulated user throughput in a cellular is investigated firstly.It shows that capacity improvement can be obtained using higher operating frequency band,especially in hotspot scenarios.Secondly,the architecture of the distributed antenna system(DAS) is introduced to overcome the disadvantages of weak coverage and rank deficient for the traditional multiple-input multiple-output(MIMO) systems using higher frequency bands in line-of-sight(LOS)environments.In addition,a software-defined-radio(SDR) based Gbps wireless transmission system with scalable hardware architecture is designed and implemented.Finally,a demo of outdoor DAS coverage for high data throughput application is given.Field trials show that 1 Gbps data rate and a large coverage in outdoor environments can be achieved over 6.05 GHz.It is proved that the Gbps DAS system at a higher frequency band can be a successful model for future wireless broadband coverage in hotspot scenarios.
文摘正确选择小区内部的分布式天线模块可以提高覆盖区的通信质量,如果各分布式天线模块之间没有能量协作,也即每个天线模块都有自己的功率限制,那么天线模块的覆盖范围会小于只有和功率限制的天线模块的覆盖范围.综合考虑分布式天线模块选择和天线模块的功率限制,提出了一种正三角形小区通信系统(triangular cellular communication system,TCCS)和相应的下行功率控制策略.基于多小区环境和单用户系统的假设,研究了TCCS的中断容量.仿真实验表明,TCCS在小区的不同部分都具有平坦的容量分布.实验数值分析进一步说明,即使各天线模块都有功率限制,TCCS仍然可以增大覆盖面积,并且TCCS的容量高于使用传统分布式功控策略系统.
