Opportunistic Video Communication over Cooperative Decode-Forward Networks  

作　　者：肖红江 戴琼海 季向阳 

机构地区：[1]Tsinghua National Laboratory for Information Science and Technology, Department of Automation, Tsinghua University

出　　处：《Tsinghua Science and Technology》2010年第2期209-215,共7页清华大学学报（自然科学版（英文版）

基　　金：Supported by the National Natural Science Foundation of China(No. 60772055);the Scientific and Technological Innovation Nurture Funds of MOE, China (No. 707005)

摘　　要：An opportunistic automatic repeat request （ARQ） scheme was developed to support high-quality video transmission over cooperative decode-forward networks. The opportunistic ARQ is implemented in the form of distributed space-time block codes （STBCs） and the desired STBC for a certain channel state is de- termined by the diversity-multiplexing tradeoff principle. With good channel states, the source and relay may jointly retransmit the lost video packets using high-rate low-diversity codes while with bad channel states they will retransmit the lost video packets using low-rate high-diversity codes. Furthermore, an adaptive packet dropping mechanism was introduced by considering the delay constraint and layer dependency characteristics of scalable video streaming. Test results show that the scheme significantly improves the throughput and video quality compared with other schemes. Tests also indicate that the source-relay link condition plays an important role in affecting the scheme performance.An opportunistic automatic repeat request （ARQ） scheme was developed to support high-quality video transmission over cooperative decode-forward networks. The opportunistic ARQ is implemented in the form of distributed space-time block codes （STBCs） and the desired STBC for a certain channel state is de- termined by the diversity-multiplexing tradeoff principle. With good channel states, the source and relay may jointly retransmit the lost video packets using high-rate low-diversity codes while with bad channel states they will retransmit the lost video packets using low-rate high-diversity codes. Furthermore, an adaptive packet dropping mechanism was introduced by considering the delay constraint and layer dependency characteristics of scalable video streaming. Test results show that the scheme significantly improves the throughput and video quality compared with other schemes. Tests also indicate that the source-relay link condition plays an important role in affecting the scheme performance.

关 键 词：cooperative networks opportunistic communication diversity-multiplexing tradeoff automatic repeat request scalable video 

分 类 号：TN919.8[电子电信—通信与信息系统] TP393[电子电信—信息与通信工程]