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Network coding can greatly improve the throughput and power efficiency of wireless networks by mixing packets from different flows into a single one before forwarding. However, packets need to wait for its correspondences before coding, which may induce additional delay and packet loss. Considering the diversity of traffic flows and the stochastic nature of the packet arrival process in wireless networks,...
Recent work has shown that distributed (or cooperative) beamforming can achieve cooperative gain, such as throughput gain and diversity gain, with no need for extra spectral holes in Cognitive Wireless Networks (CWNs). However, how to efficiently schedule cooperative beamforming to improve the quality of service of unlicensed secondary users has not been well addressed. In this paper, a simple opportunistic...
Opportunistic scheduling has been recognized as an effective method that significantly outperforms fixed TDMA scheduling in both channel capacity and communication reliability. Nevertheless the superior system performance comes at a price of high computational complexity, large signaling overhead, and unfairness among users. In this paper, we find that in relay-assisted next-generation wireless networks,...
Automatic repeat-request(ARQ) protocols for two-way relay systems, where two terminals communicating via a relay node, are investigated in this paper. According to different feedback schedules, we propose three basic ARQ protocols to improve the link reliability for two-way relay systems, namely Relay-only ARQ (Ro-ARQ), Terminal-only ARQ (To-ARQ) and Relay-Terminal ARQ (RT-ARQ). In addition, simulation...
In this paper, the fairness issue of delay performance for the ARQ protocol in two-user cooperative system is investigated. Relay policy between users are constrained by their own delay performance. When the delay for two users vary greatly, the system will reduce to three-node cooperation networks. Short-delay user will always provide relay service to the long-delay user if necessary to quicken the...
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