传统蜂窝网络采用固定的频谱资源分配方式,导致频谱利用率低且无法满足用户高速和高质量通信需求。针对这种局限性提出了一种将分布式天线系统(Distributed Antenna System,DAS)与终端直通(Device to Device,D2D)通信技术相结合的策略...传统蜂窝网络采用固定的频谱资源分配方式,导致频谱利用率低且无法满足用户高速和高质量通信需求。针对这种局限性提出了一种将分布式天线系统(Distributed Antenna System,DAS)与终端直通(Device to Device,D2D)通信技术相结合的策略。首先,该方案提出协同上下行链路(Uplink and Downlink Collaboration,UADC)的资源分配算法,并构建了以最大化系统总效率为目标的非线性规划问题。然后,将该问题分为最佳功率选择和信道分配2个子问题,同时利用匈牙利算法为D2D对选择最佳信道。最后,在MATLAB仿真平台进行实验。仿真结果表明,相比于仅复用上行链路的和仅使用DAS系统的方法,所提方案的频谱效率更高。展开更多
针对机器对机器(Machine to Machine, M2M)通信设备数量的持续增大导致M2M通信在当前蜂窝网络架构下会产生网络拥塞和接入成功率下降的问题,提出了一种基于设备能耗率分簇的M2M通信随机接入方法。该方法中M2M通信设备根据自身能量消耗...针对机器对机器(Machine to Machine, M2M)通信设备数量的持续增大导致M2M通信在当前蜂窝网络架构下会产生网络拥塞和接入成功率下降的问题,提出了一种基于设备能耗率分簇的M2M通信随机接入方法。该方法中M2M通信设备根据自身能量消耗率划分优等簇,即能耗率越大其优等级越高,优等级高的簇内设备享有随机接入资源的优先分配权,其随机接入资源由每簇的簇头代表簇接收,并在簇内设备之间通过随机接入竞争过程实现分配。仿真结果表明,相对于接入级限制(Access Class Barring, ACB)方法,该方法在接入成功率方面提升约5%,在延迟方面降低约10 s,能够有效降低设备能耗,提高设备接入的成功率。展开更多
Aiming at the energy consumption of long-distance device-to-device(D2D) devices for two-way communications in a cellular network,this paper proposes a strategy that combines two-way relay technology(TWRT) and simultan...Aiming at the energy consumption of long-distance device-to-device(D2D) devices for two-way communications in a cellular network,this paper proposes a strategy that combines two-way relay technology(TWRT) and simultaneous wireless information and power transfer(SWIPT) technology to achieve high energy efficiency(EE) communication.The scheme first establishes a fractional programming problem to maximize EE of D2D,and transforms it into a non-fractional optimization problem that can be solved easily.Then the problem is divided into three sub-problems:power control,power splitting ratios optimization,and relay selection.In order to maximize EE of the D2D pair,the Dinkelbach iterative algorithm is used to optimize the transmitted power of two D2D devices simultaneously;the one-dimensional search algorithm is proposed to optimize power splitting ratios;an improved optimal relay selection scheme based on EE is proposed to select relay.Finally,experiments are carried out on the Matlab simulation platform.The simulation results show that the proposed algorithm has faster convergence.Compared with the one-way relay transmission and fixed relay algorithms,the proposed scheme has higher EE.展开更多
In order to identify the multi-carrier orthogonal frequency division multiplexing(OFDM) and the single-carrier signal in the non-Gaussian noise environment, different features of the two signals are analyzed in terms ...In order to identify the multi-carrier orthogonal frequency division multiplexing(OFDM) and the single-carrier signal in the non-Gaussian noise environment, different features of the two signals are analyzed in terms of five parameters: generalized normalized fourth-order cumulant, the maximum value of the instantaneous amplitude power spectral density, absolute standard deviation of instantaneous phase on the section with weak signals, and position and numbers of the generalized cyclic spectrum's peak. The recognition method of the multi-carrier OFDM and single-carrier signal is proposed in the environment with alpha-stable distribution noise. Simulation results show that the recognition rate of the multi-carrier OFDM can reach 100% when the mixed signal to noise ratio(MSNR) is greater than-5 dB and the recognition rate can reach 90% for the single-carrier when the MSNR is greater than 2 dB.展开更多
文摘传统蜂窝网络采用固定的频谱资源分配方式,导致频谱利用率低且无法满足用户高速和高质量通信需求。针对这种局限性提出了一种将分布式天线系统(Distributed Antenna System,DAS)与终端直通(Device to Device,D2D)通信技术相结合的策略。首先,该方案提出协同上下行链路(Uplink and Downlink Collaboration,UADC)的资源分配算法,并构建了以最大化系统总效率为目标的非线性规划问题。然后,将该问题分为最佳功率选择和信道分配2个子问题,同时利用匈牙利算法为D2D对选择最佳信道。最后,在MATLAB仿真平台进行实验。仿真结果表明,相比于仅复用上行链路的和仅使用DAS系统的方法,所提方案的频谱效率更高。
文摘针对机器对机器(Machine to Machine, M2M)通信设备数量的持续增大导致M2M通信在当前蜂窝网络架构下会产生网络拥塞和接入成功率下降的问题,提出了一种基于设备能耗率分簇的M2M通信随机接入方法。该方法中M2M通信设备根据自身能量消耗率划分优等簇,即能耗率越大其优等级越高,优等级高的簇内设备享有随机接入资源的优先分配权,其随机接入资源由每簇的簇头代表簇接收,并在簇内设备之间通过随机接入竞争过程实现分配。仿真结果表明,相对于接入级限制(Access Class Barring, ACB)方法,该方法在接入成功率方面提升约5%,在延迟方面降低约10 s,能够有效降低设备能耗,提高设备接入的成功率。
基金Supported by the National Natural Science Foundation of China (No.61561031)。
文摘Aiming at the energy consumption of long-distance device-to-device(D2D) devices for two-way communications in a cellular network,this paper proposes a strategy that combines two-way relay technology(TWRT) and simultaneous wireless information and power transfer(SWIPT) technology to achieve high energy efficiency(EE) communication.The scheme first establishes a fractional programming problem to maximize EE of D2D,and transforms it into a non-fractional optimization problem that can be solved easily.Then the problem is divided into three sub-problems:power control,power splitting ratios optimization,and relay selection.In order to maximize EE of the D2D pair,the Dinkelbach iterative algorithm is used to optimize the transmitted power of two D2D devices simultaneously;the one-dimensional search algorithm is proposed to optimize power splitting ratios;an improved optimal relay selection scheme based on EE is proposed to select relay.Finally,experiments are carried out on the Matlab simulation platform.The simulation results show that the proposed algorithm has faster convergence.Compared with the one-way relay transmission and fixed relay algorithms,the proposed scheme has higher EE.
基金Supported by the National Natural Science Foundation of China(No.61561031,61562058)the Natural Science Foundation of Gansu Province(No.1508RJZA054)
文摘In order to identify the multi-carrier orthogonal frequency division multiplexing(OFDM) and the single-carrier signal in the non-Gaussian noise environment, different features of the two signals are analyzed in terms of five parameters: generalized normalized fourth-order cumulant, the maximum value of the instantaneous amplitude power spectral density, absolute standard deviation of instantaneous phase on the section with weak signals, and position and numbers of the generalized cyclic spectrum's peak. The recognition method of the multi-carrier OFDM and single-carrier signal is proposed in the environment with alpha-stable distribution noise. Simulation results show that the recognition rate of the multi-carrier OFDM can reach 100% when the mixed signal to noise ratio(MSNR) is greater than-5 dB and the recognition rate can reach 90% for the single-carrier when the MSNR is greater than 2 dB.
