Optimal precoding for a QoS optimization problem in two-user MISO-NOMA downlink

Chen, Zhiyong and Ding, Zhiguo and Xu, Peng and Dai, Xuchu (2016) Optimal precoding for a QoS optimization problem in two-user MISO-NOMA downlink. IEEE Communications Letters, 20 (6). pp. 1263-1266. ISSN 1089-7798

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In this letter, based on the non-orthogonal multiple access (NOMA) concept, a quality-of-service optimization problem for two-user multiple-input-single-output broadcast systems is considered, given a pair of target interference levels. The minimal power and the optimal precoding vectors are obtained by considering its Lagrange dual problem and via Newton's iterative algorithm, respectively. Moreover, the closed-form expressions of the minimal transmission power for some special cases are also derived. One of these cases is termed quasi-degraded, which is the key point and will be discussed in detail in this letter. Our analysis further figures out that the proposed NOMA scheme can approach nearly the same performance as optimal dirty paper coding, as verified by computer simulations.

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IEEE Communications Letters
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04 Aug 2016 10:58
Last Modified:
21 Jun 2024 00:42