吉林大学学报(工学版) ›› 2014, Vol. 44 ›› Issue (5): 1481-1487.doi: 10.7964/jdxbgxb201405041

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Resource allocation algorithm in DF relay assisted OFDM cognitive radio systems

ZHAO Xiao-hui,SHA Jing-qi   

  1. Laboratory of Information Science, College of Communication Engineering, Jilin University, Changchun 130012, China
  • Received:2013-05-15 Online:2014-09-01 Published:2014-09-01

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Abstract: For resource allocation in multi-relay assisted OFDM radio systems, most current relay and power allocation algorithms use Lagrangian dual decomposition technique to find the optimal solutions. This approach has good performance but the computational complexity is higher. To solve this problem, a resource allocation algorithm with low computational complexity is proposed. The proposed algorithm relaxes the integrality constraint on the relay selection factor. It takes both subcarriers channel conditions and the interference to the primary users introduced by the secondary users into account in the relay selection. A sub-optimal power allocation scheme is given on the basis of the properties of the total system power and interference constraints, in which the power allocation is conducted step by step. The system capacity is guaranteed with lower computational complexity. Simulation results show that the proposed algorithm can ensure that the interference introduced to the primary users is within the threshold, and can also improve the system capacity of the secondary users at the same time. Thus, the feasibility of the proposed algorithm is verified.

Key words: communication technology, multi-relay-assisted OFDM systems, cognitive radio, relay selection, power allocation

CLC Number: 

  • TN929
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