吉林大学学报(工学版) ›› 2016, Vol. 46 ›› Issue (2): 671-677.doi: 10.13229/j.cnki.jdxbgxb201602050

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Enhanced scaled selection combiner for decode-and-forward systems with adaptive modulation

ZHAO Da-wei, ZHAO Hong-lin, MA Yong-kui, JIA Min   

  1. Communication Research Center, Harbin Institute of Technology, Harbin 150080, China
  • Received:2014-03-13 Online:2016-02-20 Published:2016-02-20

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Abstract: An Enhanced Scaled Selection Combiner (ESSC) is proposed for Decode-and-Forward (DF) cooperative networks, where different modulation levels are adopted by the source and relay nodes to improve spectral efficiency. When the ESSC is used to combine signals from different diversity branches, the source-relay-destination branch is weighted by varying scale factors. As a result, the performance degradation caused by erroneous relaying in DF networks can be effectively mitigated by ESSC. Towards this end, the Bit-Error-Rate (BER) expression is derived for DF networks using ESSC under Rayleigh fading channels, and the scale factors of the ESSC are optimized to minimize the system BER. Theoretical analysis and simulation results demonstrate that a diversity order close to two can be achieved by ESSC. Furthermore, a power allocation scheme is proposed for DF networks based on ESSC, which can further improve the performance of cooperation.

Key words: communication technology, selection combiner, decode-and-forward, cooperative diversity, adaptive modulation

CLC Number: 

  • TN925
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