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Centralized algorithms for relay selection and power allocation in cooperative networks have been widely considered in the literature. As effective as the proposed algorithms are, the complexity of centralized implementation and feedback required to communicate the required channel state information makes these solutions impractical. Here we investigate, in terms of the achievable rates for the nodes,...
We consider the problem of optimal power allocation over a family of parallel Gaussian relay channels, each with a different set of channels' power gains. The applied cooperative strategy is half-duplex regenerative decode-and-forward which is multiplexed orthogonally with a direct transmission link from the source node to the destination node. We assume the availability of channel-state-information...
In this paper, the average rate maximization problem given transmission power constraints in a decode-and-forward (DF) relay network over slow fading channels is studied. For the problem, either a long- or short-term power constraint is imposed on the source and relays. In each combination of the power constraints at the source and relays, the original optimization problem is decomposed into subproblems,...
Owing to its spectral efficiency, bidirectional relaying is a promising candidate for information exchange in multiple-user cooperative networks. When the network is limited by resource constraints, amplify-and-forward (AaF) relay protocol is often the choice due to its simplicity and ease of use. Power allocation for AaF protocol has being extensively studied in unidirectional relay networks but...
In this paper, we consider cross-layer scheduling for the downlink of amplify-and-forward (AF) relay assisted orthogonal frequency division multiple access (OFDMA) networks. The proposed cross-layer design takes into account the effects of imperfect channel state information at transmitter (CSIT) in slow fading. The rate adaptation, power adaptation, and subcarrier allocation policies are optimized...
Reliability of radio link is limited due to path loss, shadowing and multi-path fading, thereby necessitating the use of some type of diversity. Cooperative relaying has gained considerable attention in recent years. Relays cooperates in such a way that they share their antennas and other resources to create a virtual array through distributed transmission and signal processing. Energy issue for such...
This paper explores the attributes, layering models and objective functions in cross layer designs for mobile ad hoc wireless networks by taking all the statistical characteristics and constraints from the physical (PHY) layer, media access control (MAC) layer and network (NET) layer into consideration. This paper reviews the entire network optimization across all the PHY/MAC/NET layers. At the PHY...
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