Decision Threshold-aided Fast Z-Forward in Wireless Multirelay Communications
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摘要: 针对Z向转发(ZF)协作所有中继节点均参与协作转发导致的能耗利用不合理问题， 该文提出了一种适用于多中继场景下的门限辅助判决快速Z转发(DT-FZF)协作。当中继节点处接收信号对数似然比(LLR)的绝对值小于门限时，中继节点不参与协作转发；否则中继节点协作转发经截断后的对数似然比(LLR)。放大转发(AF)、译码转发(DF)、分段转发(PF)和ZF协作可看作DT-FZF协作的特殊情况。在三中继系统，误比特率(BER)为10–3时，相比ZF协作，所提协作可获得约0.8 dB的性能增益。Abstract: In consideration of improper power allocation and insufficient relay selection in the current Z-Forward (ZF) scheme, an efficient Decision Threshold-aided Fast Z-Forward (DT-FZF) scheme is proposed to improve power and transmission efficiency. When the absolute value of the Log-Likelihood Ratio (LLR) of a source-relay reception is less than the decision threshold, the relay remains quiet. Otherwise, it directly sends the truncated LLR to the destination. In addition, the proposed DT-FZF scheme incorporates the Amplify-Forward(AF), Decode-Forward(DF), Piecewise-Forward(PF) and ZF schemes, all of which can be the special case of the proposed scheme. At a Bit Error Rate (BER) is of 10–3, the DT-FZF scheme outperforms the ZF scheme by approximately 0.8 dB in a three-relay system.
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Key words:
- Multirelay networks /
- Cooperative communication /
- Z-Forward(ZF) /
- Decision threshold
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表 1 采用DT-FZF协作的双中继系统θ2i最优取值，θ21=θ22
SNRSR(dB) 0 1 2 3 4 5 6 7 8 9 10 θ21 0.25 0.25 0.30 0.30 0.30 0.30 0.30 0.35 0.35 0.35 0.40 
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表 2 采用DT-FZF协作的双中继系统θ2i最优取值，θ21≠θ22
SNRSR(dB) 0 1 2 3 4 5 (θ21,θ22) (0.15, 0.25) (0.15, 0.25) (0.15, 0.25) (0.20, 0.30) (0.20,0.30) (0.25, 0.30) SNRSR(dB) 6 7 8 9 10 (θ21,θ22) (0.25,0.30) (0.25,0.35) (0.30,0.35) (0.30,0.35) (0.30,0.40)
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表 3 采用DT-FZF协作的三中继系统θ21最优取值，θ21=θ22=θ23
SNRSR(dB) 0 1 2 3 4 5 6 7 8 9 10 θ21 0.30 0.30 0.30 0.35 0.35 0.35 0.35 0.35 0.40 0.40 0.45
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