Computer Science ›› 2016, Vol. 43 ›› Issue (11): 172-175.doi: 10.11896/j.issn.1002-137X.2016.11.033

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New Optimal Power Allocation Scheme in HDAF Protocol under High Signal to Noise Ratio Conditions

DUANMU Chun-jiang and WANG Zhen-yu   

  • Online:2018-12-01 Published:2018-12-01

Abstract: The hybrid decode-amplify-forward(HDAF) protocol has recently been proposed in the literature.And it can remarkably outperforms the decode-and-forward and the amplify-and-forward protocol.In this paper,the optimal power allocation problem in hybrid decode-amplify-forward protocol was deeply studied.Firstly,practical formula for the symbol error rate in the hybrid decode-amplify-forward protocol is derived in the literature.Then,the mathematical model of the power allocation problem in the protocol is mathematically formulated,which minimizes the symbol error rate under the total power constraint.Finally,simulations using Matlab programs are designed to verify the proposed formulas and confirm the proposed approach to solve the problem.Numerical results demonstrate that the optimum power allocation factor in the HDAF protocol is not only related to the channel conditions of the source-to-relay channel and the relay-to-destination channel,but also related to the total power of system.It is also discovered in our research that with the sufficient increase of the allowed total power,the optimum power allocation factor will asymmetrically approximate 1/2.

Key words: Hybrid decode-amplify-forward protocol,Relay,Power allocation,Symbol error rate

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