基于簇用户协作的SC-FDMA中继传输方案

该文以长期演进时分双工(long-term evolutiontime division duplex,LTE TDD)上行链路单载波频分多址(single carrier-frequency division multiple addressing,SC-FDMA)传输方案为基础,提出了一种基于簇用户协作的上行链路中...     

印制板行业产学研,怎么研?

阐述我国印制板行业开展产学研合作的重要意义,目前行业产学研合作的现状,企业开展产学研合作的体会及经验教训.说明建设以企业为主体,市场为导向,产学研结合的技术创新体系是做强做优中国PCB(印制电路板)行业,培育形象良好的世界一流企业的重要举措.     

混合传播方式Ad hoc无线网络的容量研究

提出一种混合传播方式Ad hoc网络容量研究的方法,通过比较各传播方式在其相应规模下的容量确定主导传播方式并得出网络总容量。并以单播和多播混合传播为例,研究在基于多跳、MIMO和层次化合作情况下的主导传播方式和网络总容量。当该混合网络中单播的结节过半时,由多播传播方式确定网络的总容量。     

基于阵型和动态角色分配的射门协作方法

针对复杂、实时、动态的RoboCup仿真环境下的多智能体协作问题,提出在比赛阵型和基本角色的基础上,利用阵型中关键智能体来组织实现多智能体间协作,分配协作智能体的角色,并利用这种方法来规划进攻时的射门动作.本文主要利用该协作方法,根据球员和场上信息建立在进攻时对方禁区范围内的状态模型,利用关键球员组织协作策略、对球员进...     

基于冗余前置的机会编码协同中继策略

对于多节点的协同网络,机会编码协同总是选择最佳中继参与协同,能够取得优越的中断概率性能。为了进一步提高中断概率性能,提出了基于冗余前置的机会编码协同中继策略,并对其在瑞利平坦慢衰落信道条件下的中断概率性能进行了计算机仿真。结果表明,所提策略的中断概率性能明显优于机会编码协同中继策略,若所要求的中断概率为10-3,当潜在协同中继数目为7,协同等级为0.5,目标信息速率为1 bit/s/Hz的条件下,所提策略较机会编码协同中继策略可以获得1.9 dB的信噪比增益。     

一种基于中继的认知无线电网络合作频谱感知方法

文章提出一种新的合作感知方法,实现网络中一个认知用户与多个中继用户的合作。认知用户通过能量检测选择中继用户,根据可信度对中继用户进行筛选,采用＂大多数＂准则对感知结果进行融合。仿真结果表明,与独立检测和传统的合作检测相比较,该方法具有更高的检测性能与频谱利用率。     

CLIMATE CHANGE AND COOPERATION IN TRANSBOUNDARY WATER SHARING: AN APPLICATION OF STOCHASTIC STACKELBERG DIFFERENTIAL GAMES IN VOLTA RIVER BASIN

Abstract As multiple countries share a river, the likelihood of conflicts over distributing water resources increases, particularly under the effects of climate change. In this paper, we demonstrate how countries can cooperate in sustainable transboundary water sharing under such conditions. We examine the case of water distribution in the Volta Basin of West Africa between the upstream country, Burkina Faso, and the downstream country, Ghana. The latter faces an additional tradeoff between the production of hydropower in the south, close to the outlet of the basin, and agricultural water use in the reservoir’s catchment area in the north. In the framework of a stochastic Stackelberg differential game, we show how sustainable water‐sharing agreements can be achieved by linking transboundary flows to hydropower exports. Our results indicate that, through cooperation, Ghana will have an opportunity to increase its water abstraction for agriculture, which has remained largely restricted. We also find that the equilibrium strategies for the long‐run distribution are stable even with increasing variances of water flow.     

Investigating the Turing Conditions for Diffusion-driven Instability in Predator-prey System with Hunting Cooperation Functional Response

In this paper, we focus on stability analysis of steady-state solutions of a predator-prey system with hunting cooperation functional response. The results show that the Turing instability can be affected not only the existence of hunting cooperation, but also the diffusion coefficients: (1) in the absence of predator diffusion, diffusion-driven instability can be induced by hunting cooperation, but no stable patterns appear; (2) the system can occur diffusion-driven instability and Turing patterns, when both predator and prey have diffusion, and the diffusion coefficient of prey is greater than that of the predator. The numerical simulations of two cases are presented to verify the validity of our theoretical results.     

基于Turbo码的机会编码协同策略

提出一种多中继协同无线网络的机会编码协同策略,该策略基于Turbo编码,利用信道条件信息机会选择最优协同节点。通过数学分析,给出了系统中断性能和瑞利衰落下的中断概率表达式,计算机仿真结果进一步揭示了机会编码协同相对于传统编码协同的优势。