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arXiv 1104.5534cs.ITmath.IT
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认知无线电网络中多媒体传输的QoS配置

QoS Provisioning for Multimedia Transmission in Cognitive Radio Networks

F. Richard Yu, Bo Sun, Vikram Krishnamurthy, Saqib Ali

摘要:

在认知无线电(CR)网络中,感知的应用层服务质量(QoS)的降低,如多媒体失真,由次要用户可能会阻碍CR技术的成功。以往的CR网络研究大多忽略了应用层的QoS。在本文中,我们采取了一个综合的设计方法,联合优化多媒体帧内刷新率,应用层参数,与接入策略,和频谱感知的多媒体传输在CR系统与时变无线信道。主网络使用和信道增益被建模为有限状态马尔可夫过程。在信道感知和信道状态信息错误的情况下,系统状态不能被直接观测。我们制定的QoS优化问题作为一个部分可观察的马尔可夫决策过程(POMDP)。提出了一个低复杂度的动态规划框架来获得最优策略。仿真结果表明了该方案的有效性。

英文摘要:

In cognitive radio (CR) networks, the perceived reduction of application layer quality of service (QoS), such as multimedia distortion, by secondary users may impede the success of CR technologies. Most previous work in CR networks ignores application layer QoS. In this paper we take an integrated design approach to jointly optimize multimedia intra refreshing rate, an application layer parameter, together with access strategy, and spectrum sensing for multimedia transmission in a CR system with time varying wireless channels. Primary network usage and channel gain are modeled as a finite state Markov process. With channel sensing and channel state information errors, the system state cannot be directly observed. We formulate the QoS optimization problem as a partially observable Markov decision process (POMDP). A low complexity dynamic programming framework is presented to obtain the optimal policy. Simulation results show the effectiveness of the proposed scheme.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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