Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/20901
Title: Optimal relay assignment and power allocation for cooperative communications
Authors: Xie, K
Cao, JN 
Wen, JG
Keywords: Cooperative communication
Dual decomposition
Network capacity
Power allocation
Relay assignment
Issue Date: 2013
Source: Journal of computer science and technology, 2013, v. 28, no. 2, p. 343-356 How to cite?
Journal: Journal of Computer Science and Technology 
Abstract: Cooperative communication for wireless networks has gained a lot of recent interest due to its ability to mitigate fading with exploration of spatial diversity. In this paper, we study a joint optimization problem of jointly considering transmission mode selection, relay assignment and power allocation to maximize the capacity of the network through cooperative wireless communications. This problem is much more challenging than relay assignment considered in literature work which simply targets to maximize the transmission capacity for a single transmission pair. We formulate the problem as a variation of the maximum weight matching problem where the weight is a function over power values which must meet power constraints (VMWMC). Although VMWMC is a non-convex problem whose complexity increases exponentially with the number of relay nodes, we show that the duality gap of VMWMC is virtual zero. Based on this result, we propose a solution using Lagrange dual decomposition to reduce the computation complexity. We do simulations to evaluate the performance of the proposed solution. The results show that our solution can achieve maximum network capacity with much less computation time compared with exhaustive search, and our solution outperforms existing sub-optimal solutions that can only achieve much lower network capacity.
URI: http://hdl.handle.net/10397/20901
ISSN: 1000-9000
DOI: 10.1007/s11390-013-1335-3
Appears in Collections:Journal/Magazine Article

Access
View full-text via PolyU eLinks SFX Query
Show full item record

SCOPUSTM   
Citations

6
Last Week
0
Last month
0
Citations as of Sep 22, 2017

WEB OF SCIENCETM
Citations

5
Last Week
0
Last month
0
Citations as of Sep 24, 2017

Page view(s)

31
Last Week
1
Last month
Checked on Sep 25, 2017

Google ScholarTM

Check

Altmetric



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.