Near-Optimal Power Allocation with PSO Algorithm for MIMO Cognitive Networks using Multiple AF Two-Way Relays


In this paper, the problem of power allocation for a multiple-input multiple-output two-way system is investigated in underlay Cognitive Radio (CR) set-up. In the CR underlay mode, secondary users are allowed to exploit the spectrum allocated to primary users in an opportunistic manner by respecting a tolerated temperature limit. The secondary networks employ an amplify-and-forward two-way relaying technique in order to maximize the sum rate under power budget and interference constraints. In this context, we formulate an optimization problem that is solved in two steps. First, we derive a closed-form expression of the optimal power allocated to terminals. Then, we employ a strong optimization tool based on particle swarm optimization algorithm to find the power allocated to secondary relays. Simulation results demonstrate the efficiency of the proposed solution and analyze the impact of some system parameters on the achieved performance.

Meeting Name

1st IEEE International Conference on Communications, ICC 2014 (2014: Jun. 10-14, Sydney, NSW, Australia)


Electrical and Computer Engineering

Keywords and Phrases

Multiple-input multiple-output; particle swarm optimization; two-way cognitive radio

International Standard Book Number (ISBN)


International Standard Serial Number (ISSN)

1550-3607; 1938-1883

Document Type

Article - Conference proceedings

Document Version


File Type





© 2014 IEEE Computer Society, All rights reserved.

Publication Date

01 Jun 2014