On the Study of Quasi-degraded Channel to CoMP-NOMA System
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In this paper, quasi-degraded channel is studied for downlink CoMP-NOMA system. In quasidegraded channel, given the users target rates and the maximum transmit power of each base station, CoMP-NOMA can achieve the same minimal total transmission power as Dirty paper coding (DPC). This paper provides the mathematical condition for the channel to satisfy quasi-degradation. And closedform expression for the optimal precoding vector of CoMP-NOMA under quasi-degraded channel is provided. A novel greedy algorithm with superior performance is proposed by applying quasi-degraded
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