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In this paper, we investigate the energy efficiency of cooperative communications in wireless body area network (WBAN). We first analyze the outage performance of three transmission schemes, namely direct transmission, single-relay cooperation, and multi-relay cooperation. To minimize the energy consumption, we then study the problem of optimal power allocation with the constraint of targeted outage...
In this paper, we study two fundamental issues of cooperative communications in distributed wireless networks, namely when to cooperate and whom to cooperate with. In specific, we focus on cross-layer medium access control (MAC) protocol design with beneficial node cooperation. To increase long-term network throughput, we propose an optimal grouping strategy for relay node selection, and devise a...
In this paper, we investigate benefits of cooperative communication in mobile ad hoc networks (MANETs). Cooperative communication as an effective way to mitigate channel impairments has attracted much attention, especially on the physical layer. However, without properly designed higher- layer protocols, the cooperation gain can decrease and even disappear, due to factors such as limited payload and...
An Amplify-and-Forward multicarrier cooperative system is proposed in this paper. The optimal resource-allocation (joint power allocation and subcarrier assignment problem) has been investigated for improving the system's bit-error rate (BER) performance. Utilizing the steepest-descent algorithm, an optimal resource-allocation algorithm is proposed. And a suboptimal resource-allocation algorithm with...
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