吉林大学学报(工学版) ›› 2014, Vol. 44 ›› Issue (2): 478-484.doi: 10.13229/j.cnki.jdxbgxb201402032

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Selective subcarrier relaying and power allocation algorithm for multi-relay-assisted OFDM systems

ZHAO Xiao-hui, YANG Wei-wei, JIN Xiao-guang   

  1. Laboratory of Information Science, College of Communication Engineering, Jilin University, Changchun 130012, China
  • Received:2013-02-25 Online:2014-02-01 Published:2014-02-01

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Abstract:

For multi-relay-assisted Orthogonal Frequency Division Multiplexing (OFDM) cooperative systems with Amplify-and-Forward (AF) mode, when relay nodes are close to the source node, higher system gain can be achieved, otherwise, the system will get lower gain. Under the condition that each relay node has individual power constraint, the more subcarriers relay nodes forward, the less power of each sub-carrier is allocated. Greater power gain can be acquired when some of the sub-carriers are forwarded by idle relay nodes instead of the previous busy node. Therefore, we propose an improved algorithm. In this algorithm, when relay nodes are close to the source node, we make full use of the power of the free relay nodes to increase system capacity. When relay nodes are far from the source node, the relay node number is reduced to decrease system complexity. Simulation results show that the improved algorithm can obtain higher system capacity when the relay nodes are close to the source node, and it also can approximately maintain system capacity unchanged with lower system complexity when relay nodes are far from the source node.

Key words: communication, multi-relay-assisted OFDM communication systems, selective subcarrier relaying, power allocation

CLC Number: 

  • TN929

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