Joint power and bandwidth allocation for multiuser amplify and forward cooperative communications using particle swarm optimization

Joint power and bandwidth allocation for multiuser single relay amplify and forward cooperative network is addressed. Conventional resource allocation schemes based on equal distribution of bandwidth and/or power may not be efficient given the constrained power and bandwidth at the relay node. Joint power and bandwidth allocation is proposed based on maximization of the sum rate of all users. For a given user bandwidth, frequency division multiplexing (FDM) is used; part of the data is transmitted through the relay, and the other part is transmitted using the direct link. The achieved data rate using AF (with amplification gain proportional to instantaneous channel information of the source-relay link) for a single user is not jointly-concave function in the power and bandwidth profiles. Based on the optimal power and bandwidth allocation for every user, the data either transmitted solely using the direct link, or transmitted using the relay link on part of the bandwidth and the direct link on the other part. For this scenario, the problem is formulated as a mixed integer nonlinear optimization problem. Conventional optimization schemes can not be used. Particle swarm optimization (PSO) is used to solve the formulated problem. Numerical results demonstrate the effectiveness of the proposed scheme, and shed interesting throughput-fairness trade-off in the resource allocation problem.

[1]  Cem U. Saraydar,et al.  Efficient power control via pricing in wireless data networks , 2002, IEEE Trans. Commun..

[2]  Elza Erkip,et al.  User cooperation diversity. Part II. Implementation aspects and performance analysis , 2003, IEEE Trans. Commun..

[3]  Chintha Tellambura,et al.  Joint Bandwidth and Power Allocation With Admission Control in Wireless Multi-User Networks With and Without Relaying , 2010, IEEE Transactions on Signal Processing.

[4]  Mazen O. Hasna,et al.  Optimal power allocation for relayed transmissions over Rayleigh-fading channels , 2004, IEEE Transactions on Wireless Communications.

[5]  Raviraj S. Adve,et al.  Improving amplify-and-forward relay networks: optimal power allocation versus selection , 2006, IEEE Transactions on Wireless Communications.

[6]  Tho Le-Ngoc,et al.  Power allocation in wireless multi-user relay networks , 2009, IEEE Transactions on Wireless Communications.

[7]  Roy D. Yates,et al.  Bandwidth and power allocation for cooperative strategies in Gaussian relay networks , 2004 .

[8]  Zhu Han,et al.  Distributed Relay Selection and Power Control for Multiuser Cooperative Communication Networks Using Stackelberg Game , 2009, IEEE Transactions on Mobile Computing.

[9]  Peter Larsson,et al.  Large-Scale Cooperative Relaying Network with Optimal Coherent Combining under Aggregate Relay Power Constraints , 2003 .

[10]  Yangyang Zhang,et al.  Optimizing relay selection and power allocation for orthogonal multiuser downlink systems , 2009, 2009 International Conference on Wireless Communications & Signal Processing.

[11]  Elza Erkip,et al.  User cooperation diversity. Part I. System description , 2003, IEEE Trans. Commun..

[12]  Hussein M. Alnuweiri,et al.  Joint Power and Resource Allocation for Block-Fading Relay-Assisted Broadcast Channels , 2011, IEEE Transactions on Wireless Communications.

[13]  Yiwei Thomas Hou,et al.  An Optimal Algorithm for Relay Node Assignment in Cooperative Ad Hoc Networks , 2011, IEEE/ACM Transactions on Networking.

[14]  Riccardo Poli,et al.  Particle swarm optimization , 1995, Swarm Intelligence.

[15]  Mostafa Kaveh,et al.  Exact symbol error probability of a Cooperative network in a Rayleigh-fading environment , 2004, IEEE Transactions on Wireless Communications.

[16]  Raviraj S. Adve,et al.  Non-Coherent Code Acquisition in the Multiple Transmit/Multiple Receive Antenna Aided Single- and Multi-Carrier DS-CDMA Downlink , 2007 .

[17]  Xigang Yuan,et al.  An improved PSO algorithm for solving non-convex NLP/MINLP problems with equality constraints , 2007, Computers and Chemical Engineering.

[18]  Gregory W. Wornell,et al.  Cooperative diversity in wireless networks: Efficient protocols and outage behavior , 2004, IEEE Transactions on Information Theory.

[19]  Mazen O. Hasna,et al.  End-to-end performance of transmission systems with relays over Rayleigh-fading channels , 2003, IEEE Trans. Wirel. Commun..