On User Pairing in Uplink NOMA - 2018


User pairing in non-orthogonal multiple-access (NOMA) uplink is investigated considering some predefined power allocation schemes. The base station divides the set of users into disjunct pairs and assigns the obtainable resources to these pairs. The combinatorial drawback of user pairing to realize the utmost sum rate is analyzed in the large system limit for various scenarios, and a few optimum and sub-optimum algorithms with a polynomial-time complexity are proposed. In the first state of affairs, a pair of M users and the bottom station have a singleantenna and communicate over M subcarriers. The performance of optimum pairing is derived for M ? 8 and shown to be superior to random pairing and orthogonal multiple access techniques. In the second setting, a unique NOMA scheme for a multi-antenna base station and single carrier communication is proposed. During this case, the users need not be aware of the pairing strategy. Furthermore, the proposed NOMA theme is generalized to multi-antenna users. It's shown that for the thought of power allocation theme, random and optimum user pairing perform equally in the massive system limit, but optimum pairing is significantly higher in finite dimensions. It is shown that NOMA with the proposed user pairing scheme outperforms a previously proposed NOMA with signal alignment.

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