针对基于设备到设备(device-to-device,D2D)的蜂窝网络下车载无线通信技术(cellular-vehicle to everything,C-V2X)中复用蜂窝用户资源带来的能效问题,提出了一种能效优化算法。通过新的功率控制方法最大化车载用户(vehicle user,V-UE)...针对基于设备到设备(device-to-device,D2D)的蜂窝网络下车载无线通信技术(cellular-vehicle to everything,C-V2X)中复用蜂窝用户资源带来的能效问题,提出了一种能效优化算法。通过新的功率控制方法最大化车载用户(vehicle user,V-UE)总能效,并利用能量收集技术提高V-UE能效。该算法采用拉格朗日乘数法减少约束条件数目,利用改进的Dinkelbach方法将原问题转换为等效减式优化问题,并求出V-UE功率控制范围。数值仿真结果表明,该算法能够在V-UE用户之间的不同距离内获得最优能效。展开更多
The space time spreading, superimposed training sequences, and space-time coding are used to present a multiple input and multiple output （MIMO） systems model, and a closed-form of average error probability upper bo...The space time spreading, superimposed training sequences, and space-time coding are used to present a multiple input and multiple output （MIMO） systems model, and a closed-form of average error probability upper bound expression for MIMO correlated frequency-selective channel in the presence of interference （co-channel interference and jamming signals） is derived. Moreover, the correlation at both ends of the wireless link that can be incorporated equivalently into correlation at the transmit end is also derived, which is significant to analyze space-time link algorithm of MIMO systems.展开更多
Matrix perturbation theory is utilized to investigate high-rank line of sight multiple input multiple output channels in a microwave relay system. The upper and lower bounds of channel capacity are derived based on sp...Matrix perturbation theory is utilized to investigate high-rank line of sight multiple input multiple output channels in a microwave relay system. The upper and lower bounds of channel capacity are derived based on space time block codes technique and singular values decomposition. A useful constraint for designing LOS MIMO channels is developed by the use of the condition number of the MIMO channel matrix. The theoretical analysis of channel capacity is confirmed by the simulation. The results show that the proposed method is able to give a physical explanation of the high-rank LOS MIMO channel matrix characteristics.展开更多
文摘针对基于设备到设备(device-to-device,D2D)的蜂窝网络下车载无线通信技术(cellular-vehicle to everything,C-V2X)中复用蜂窝用户资源带来的能效问题,提出了一种能效优化算法。通过新的功率控制方法最大化车载用户(vehicle user,V-UE)总能效,并利用能量收集技术提高V-UE能效。该算法采用拉格朗日乘数法减少约束条件数目,利用改进的Dinkelbach方法将原问题转换为等效减式优化问题,并求出V-UE功率控制范围。数值仿真结果表明,该算法能够在V-UE用户之间的不同距离内获得最优能效。
基金the National Basic Research Program of China "973"(2008CB317109)the National "863" High-Tech Research and Development Program (2002AA123032)+2 种基金the National Natural Science Foundation of China (60572054)the Innovative Research Team Program of University of Electronic and Technology of Chinathe Doctor Foundation of Guilin University of Electronic Technology.
文摘The space time spreading, superimposed training sequences, and space-time coding are used to present a multiple input and multiple output （MIMO） systems model, and a closed-form of average error probability upper bound expression for MIMO correlated frequency-selective channel in the presence of interference （co-channel interference and jamming signals） is derived. Moreover, the correlation at both ends of the wireless link that can be incorporated equivalently into correlation at the transmit end is also derived, which is significant to analyze space-time link algorithm of MIMO systems.
基金supported partly by the National Natural Science Foundation of China(60872022)the"973"Program of China(2008CB317109),the Science Foundation of Guangxi Province of China(0991241)the Foundation of Guangxi Key Laboratory of Information and Communication(10903).
文摘Matrix perturbation theory is utilized to investigate high-rank line of sight multiple input multiple output channels in a microwave relay system. The upper and lower bounds of channel capacity are derived based on space time block codes technique and singular values decomposition. A useful constraint for designing LOS MIMO channels is developed by the use of the condition number of the MIMO channel matrix. The theoretical analysis of channel capacity is confirmed by the simulation. The results show that the proposed method is able to give a physical explanation of the high-rank LOS MIMO channel matrix characteristics.
