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Optimal Throughput Fairness Trade-offs for Downlink Non-Orthogonal Multiple Access over Fading Channels | | Hong Xing
; Yuanwei Liu
; Arumugam Nallanathan
; Zhiguo Ding
; H. Vincent Poor
; | | Date: |
4 Aug 2017 | | Abstract: | Recently, non-orthogonal multiple access (NOMA) has attracted considerable
interest as one of the 5G-defining techniques. However, as NOMA is
intrinsically in favour of the transmission of strong users who are capable of
carrying out successive decoding, judicious designs are required to guarantee
user fairness. In this paper, a two-user downlink NOMA system over fading
channels is considered. For delay-tolerant transmission, the average sum-rate
is maximized subject to both average and peak power constraints as well as a
minimum average user rate constraint. The optimal resource allocation is
obtained using Lagrangian dual decomposition under full channel state
information at the transmitter (CSIT), while an effective power allocation
policy under partial CSIT is also developed based on analytical results. In
parallel, for delay-limited transmission, the sum of delay-limited throughput
(DLT) is maximized subject to a maximum allowable user outage constraint under
full CSIT, and the analysis for the sum of DLT is performed under partial CSIT.
Furthermore, a sophisticated orthogonal multiple access (OMA) scheme is also
studied as a benchmark to prove the superiority of NOMA over OMA with full
CSIT. Finally, the theoretical analysis is verified via simulations by means of
various trade-offs for the average sum-rate (sum-DLT) versus the minimum
(maximum) user rate (outage) requirement. | | Source: | arXiv, 1708.1403 | | Services: | Forum | Review | PDF | Favorites | |
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