Paper Info
Title
Distributed Optimization of a Multisubchannel Ad Hoc Cognitive Radio Network.
Abstract
In this paper, we study the distributed-duality-based optimization of a multisubchannel ad hoc cognitive radio network (CRN) that coexists with a multicell primary radio network (PRN). For radio resource allocation in multiuser orthogonal frequency-division multiplexing (MU-OFDM) systems, the orthogonal-access-based exclusive subchannel assignment (ESA) technique has been a popular method, but it is suboptimal in ad hoc networks, because nonorthogonal access between multiple secondary-user links by using shared subchannel assignment (SSA) can bring a higher weighted sum rate. We utilize the Lagrangian dual composition tool and design low-complexity near-optimal SSA resource allocation methods, assuming practical discrete-rate modulation and that the CRN-to-PRN interference constraint has to strictly be satisfied. However, available SSA methods for CRNs are either suboptimal or involve high complexity and suffer from slow convergence. To address this problem, we design fast-convergence SSA duality schemes and introduce several novel methods to increase the speed of convergence and to satisfy various system constraints with low complexity. For practical implementation in ad hoc CRNs, we design distributed-duality schemes that involve only a small number of CRN local information exchanges for dual update. The effects of many system parameters are presented through simulation results, which show that the near-optimal SSA duality scheme can perform significantly better than the suboptimal ESA duality and SSA-iterative waterfilling schemes and that the performance loss of the distributed schemes is small, compared with their centralized counterparts.
Year
DOI
Venue
2012
10.1109/TVT.2012.2189253
IEEE T. Vehicular Technology
Keywords
Field
DocType
Optimization,Ad hoc networks,Convergence,Interference channels,Receivers,Transmitters
Duality (mathematics),Computer science,Computer network,Electronic engineering,Duality (optimization),Resource allocation,Wireless ad hoc network,Multiplexing,Channel allocation schemes,Orthogonal frequency-division multiplexing,Cognitive radio
Journal
Volume
Issue
ISSN
61
4
0018-9545
Citations 
PageRank 
References 
7
0.48
17
Authors
4
Name
Order
Citations
PageRank
Alex Leith1774.56
Dong In Kim23784220.90
Alouini Mohamed-Slim3122611194.14
Zhiqiang Wu413417.56