标题：On the Effect of Cooperative Relaying on the Performance of Video Streaming Applications in Cognitive Radio Networks
作者：Guan, Zhangyu; Ding, Lei; Melodia, Tommaso; Yuan, Dongfeng
作者机构：[Guan, Zhangyu; Yuan, Dongfeng] Shandong Univ, Sch Informat Sci & Engn, Jinan 250100, Peoples R China.; [Guan, Zhangyu; Ding, Lei; Melodia, Tommaso] 更多
会议名称：IEEE International Conference on Communications (ICC)
会议日期：JUN 05-09, 2011
来源：2011 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS (ICC)
关键词：Cooperative transmission; cognitive radio networks; spectrum allocation;; video streaming; cross-layer design
摘要：The problem of optimal resource allocation to stream multimedia content in cognitive ad hoc networks with cooperative relays is addressed in this paper. Cooperative transmission is a promising technique to increase the capacity of wireless links by exploiting spatial diversity without multiple antennas at each node. However, mainstream research in this field focuses on optimizing physical layer performance measures, with little consideration for application-specific and network-wide performance measures. In this paper, the problem of joint video encoding rate control, power control, relay selection and channel assignment is formulated as a mixed-integer nonlinear problem (MINLP), and a solution algorithm based on a combination of the branch and bound framework and convex relaxation techniques is then proposed. The proposed solution jointly allocates channel, power, video encoding rate, and relay nodes to secondary users to maximize the network-wide video quality. Performance evaluation results show that cognitive networks with cooperative relaying can provide considerably higher video quality (in terms of the average peak signal-to-noise ratio (PSNR)) than traditional networking technologies that do not rely on cooperation and dynamic spectrum allocation.