A non-orthogonal multiple access (NOMA) approach that always outperformsorthogonal multiple access (OMA) called Fair-NOMA is introduced. In Fair-NOMA,each mobile user is allocated its share of the transmit power such that itscapacity is always greater than or equal to the capacity that can be achievedusing OMA. For any slow-fading channel gains of the two users, the set ofpossible power allocation coefficients are derived. For the infimum andsupremum of this set, the individual capacity gains and the sum-rate capacitygain are derived. It is shown that the ergodic sum-rate capacity gainapproaches 1 b/s/Hz when the transmit power increases for the case when pairingtwo random users with i.i.d. channel gains. The outage probability of thisapproach is derived and shown to be better than OMA. The Fair-NOMA approach is applied to the case of pairing a near base-stationuser and a cell-edge user and the ergodic capacity gap is derived as a functionof total number of users in the cell at high SNR. This is then compared to theconventional case of fixed-power NOMA with user-pairing. Finally, Fair-NOMA isextended to $K$ users and prove that the capacity can always be improved foreach user, while using less than the total transmit power required to achieveOMA capacities per user.
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机译：介绍了一种总是比正交多路访问（OMA）更好的非正交多路访问（NOMA）方法，称为Fair-NOMA。在Fair-NOMA中，为每个移动用户分配其发射功率份额，以使其容量始终大于或等于使用OMA可以实现的容量。对于两个用户的任何慢衰落信道增益，导出可能的功率分配系数集合。对于该集合的最小和最大，导出了单个容量增益和总速率容量增益。结果表明，当两个随机用户与i.d.配对时，当发射功率增加时，遍历总速率容量增益接近1 b / s / Hz。渠道收益。推导了这种方法的中断概率，并证明它比OMA更好。 Fair-NOMA方法适用于将近基站用户和小区边缘用户配对的情况，并且遍历容量差距是高SNR下小区中用户总数的函数。然后将其与具有用户配对的固定功率NOMA的常规情况进行比较。最后，将Fair-NOMA扩展到$ K $用户，并证明可以始终为每个用户提高容量，同时使用少于实现每个用户OMA容量所需的总发射功率。
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