Cognitive radio based efficient video multicast in TV white space

Abstract

Abstract The wireless video multicast in TV White Space (TVWS) is a challenging task due to the characteristics of the wireless channels and the video streaming. This paper studies the optimized real‐time video multicast in TVWS, and proposes a practical and bandwidth‐efficient TVWS video multicast framework. First, a TVWS‐based efficient quasi‐static spectrum access scheme is employed to reduce the spectrum switch delay. Second, a cross‐layer optimized resource scheduling scheme is proposed to further improve the multicast performance, which considers various cross‐layer design factors, including scalable video coding, adaptive modulation‐coding, to maximize the overall received video quality. Finally, the proposed resource scheduling problem is formulated as a mixed‐integer non‐linear programming problem. Considering that the video streaming is delay‐sensitive, the problem is addressed with a proposed sub‐optimal but computational efficient algorithm. The simulation results demonstrate the effectiveness and superiority of the proposed scheme.

Keywords

• Image and video coding
• Multimedia communications
• Radio links and equipment
• Optimisation techniques
• Video signal processing
• Optimisation techniques