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In this paper, we consider a Demodulate-and-Forward (DMF) cooperation system, in which a new adaptive hierarchical modulation (HM) and power allocation scheme is proposed. In our new scheme, hierarchical 16-Quadrature Amplitude Modulation (16-QAM HM) is used to offer two different degrees of protection to the transmitted messages and we also employ power allocation between source and relay. A new...
In this paper, we propose a novel mapping scheme in non-binary LDPC coded modulation system. Contrary to the mapping method in [1], we assign the variable node of less degree to the more significant bits(MSBs) of signal constellation, for the purpose of the balanced protection. Simulation results show that compare to the traditional mapping scheme, the proposed method gives 0.1 dB-0.5 dB performance...
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