Optimal power allocation for relayed transmissions over Rayleigh-fading channels

By Mazen Omar Hasna, Mohamed-Slim Alouini. IEEE Transactions on Wireless Communications, 2004

615 citations recorded by the source corpus.

Relayed transmission is a way to attain broader coverage by splitting the communication link from the source to the destination into several shorter links/hops. One of the main advantages of this communication technique is that it distributes the use of power throughout the hops. This implies longer battery life and lower interference introduced to the rest of the network. In this context, this paper investigates the optimal allocation of power over these links/hops for a given power budget. All hops are assumed to be subject to independent Rayleigh fading. Outage probability which is the probability that the link quality from source to destination falls below a certain threshold is used as the optimization criterion. Numerical results show that optimizing the allocation of power enhances the system performance, especially if the links are highly unbalanced in terms of their average fading power or if the number of hops is large. Interestingly, they also show that nonregenerative systems with optimum power allocation can outperform regenerative systems with no power optimization.

Subfields: Computer Networks and Communications, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/37d47c1d6a258dc93f0c7377afeebc4ea415db96

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Citations in the corpus

Power Allocation Schemes for Amplify-and-Forward MIMO-OFDM Relay Links (2007, background): “In [7]–[9], optimal PAs between single antenna source and relay (AF and DF) are discussed for the case of a joint sum transmit power constraint.”
Cooperative Communications in Resource-Constrained Wireless Networks (2007, background): “With full or partial knowledge of the CSI, significant improvements in terms of BER, outage probability or capacity can be attained by applying optimal power allocation among cooperating nodes.”
Non-Coherent Code Acquisition in the Multiple Transmit/Multiple Receive Antenna Aided Single- and Multi-Carrier DS-CDMA Downlink (2007, methodology): “systems was discussed in [ 10 ], where the relay nodes are used to extend the coverage area, rather than”
Distributed Relay Selection and Power Control for Multiuser Cooperative Communication Networks Using Stackelberg Game (2009, background): “The proposed approach not only helps the source find the relays at relatively better locations and “buy” an optimal amount of power from the relays, but also helps the competing relays maximize their own utilities by asking the optimal prices.”
Capacity bounds and power allocation for wireless relay channels (2005, background): “Very recently, partly spurred by the work on cooperative diversity, the relay channel has garnered much attention [23]–[36].”
Energy-Efficient Cooperative Communication Based on Power Control and Selective Single-Relay in Wireless Sensor Networks (2008, background): “Optimal energy distribution among cooperative nodes is studied in [12] to minimize the link outage probability.”
Improving amplify-and-forward relay networks: optimal power allocation versus selection (2006, background): “OPA in multihop systems was discussed in [10], where the relay nodes are used to extend the coverage area, rather than to provide diversity for improving throughput or reducing outage probability.”