In this paper, an Independent Window-Access(IWA) scheme is proposed, and the performance of an input-buffered ATM switching fabric with the IWA scheme is analysed by means of a probability generating function approach...In this paper, an Independent Window-Access(IWA) scheme is proposed, and the performance of an input-buffered ATM switching fabric with the IWA scheme is analysed by means of a probability generating function approach, the closed formulas of the average cell delay and the maximum throughput are given, and results show that the IWA scheme makes the switching fabric have better performances than traditional window-access scheme. The computer simulation results are in good agreement with these analytical results.展开更多
为实现密集化接入趋势下的高效接入管理和负载均衡,多无线接入点(access point, AP)协同网络架构成为一种可行的电力无线局域网协同架构。但多AP间可能存在互相干扰,触发帧竞争和碰撞会在一定程度上影响上行链路正交随机访问(uplink ort...为实现密集化接入趋势下的高效接入管理和负载均衡,多无线接入点(access point, AP)协同网络架构成为一种可行的电力无线局域网协同架构。但多AP间可能存在互相干扰,触发帧竞争和碰撞会在一定程度上影响上行链路正交随机访问(uplink orthogonal random access, UORA)的性能,并造成额外的功耗。为此,本文以降低多AP协同触发帧碰撞概率为核心,提出一种面向上行随机接入的电力无线局域网功耗优化方法,实现通信质量和系统能耗的均衡优化。首先,建立通过协同调整正交频分多址接入(orthogonal frequency division multiple access, OFDMA)的竞争窗口(competition window, CW)功耗优化模型,根据触发帧的发送成功概率揭示OCW调整和整体功耗的内在关联;其次,提出采用深度Q学习(deep Q-network, DQN)的OCW自适应动态调整算法,减少因碰撞重传造成的系统功耗。仿真实验表明,本文提出的功耗优化方法能够在确保吞吐量和延迟的同时降低整体功耗,实现电力无线局域网接入的可靠运行和控制。展开更多
基本LS(link space code)码具有“零相关窗”(IFW)且被用于传统大区域同步码分多址系统(LAS-CDMA),但其零相关窗的分布是不均匀的.对基本LS码片用矩阵中克罗内克积方法重新排列,得到了一类新的LS码,从数学上证明了这类新码非周期自相关...基本LS(link space code)码具有“零相关窗”(IFW)且被用于传统大区域同步码分多址系统(LAS-CDMA),但其零相关窗的分布是不均匀的.对基本LS码片用矩阵中克罗内克积方法重新排列,得到了一类新的LS码,从数学上证明了这类新码非周期自相关函数具有均匀的IFW,以及组内码字之间的IFW也是均匀分布的.码组间的非周期互相关函数具有均匀分布的IFW,或者完美理想互补的特点.计算机仿真结果验证了新码性质的正确性.展开更多
文摘In this paper, an Independent Window-Access(IWA) scheme is proposed, and the performance of an input-buffered ATM switching fabric with the IWA scheme is analysed by means of a probability generating function approach, the closed formulas of the average cell delay and the maximum throughput are given, and results show that the IWA scheme makes the switching fabric have better performances than traditional window-access scheme. The computer simulation results are in good agreement with these analytical results.
文摘基本LS(link space code)码具有“零相关窗”(IFW)且被用于传统大区域同步码分多址系统(LAS-CDMA),但其零相关窗的分布是不均匀的.对基本LS码片用矩阵中克罗内克积方法重新排列,得到了一类新的LS码,从数学上证明了这类新码非周期自相关函数具有均匀的IFW,以及组内码字之间的IFW也是均匀分布的.码组间的非周期互相关函数具有均匀分布的IFW,或者完美理想互补的特点.计算机仿真结果验证了新码性质的正确性.
