TY - JOUR
T1 - Resource Optimization in Full Duplex Non-Orthogonal Multiple Access Systems
AU - Singh, Keshav
AU - Wang, Kaidi
AU - Biswas, Sudip
AU - Ding, Zhiguo
AU - Khan, Faheem A.
AU - Ratnarajah, Tharmalingam
N1 - Funding Information:
the use of FD avoids the spectrum to be solely occupied by these users. However, one of the primary bottlenecks of T HE explosive growth of mobile users and the advent of FD-NoMA or FD in particular is the strong self-interference Internet-of-Things (IoT) communications in recent years (SI) that arises due to the reception of signals from its own transmitter and the co-channel interference (CCI) at Manuscript received November 30, 2018; revised March 25, 2019 and the DL users caused by the UL transmission [3]. Though ofcurrentversionSeptember10,2019.ThisworkwassupportedbytheU.K.June7,2019;acceptedJune9,2019.DateofpublicationJune24,2019;date recent research works reveal several techniques to mitigate Engineering and Physical Sciences Research Council (EPSRC) under Grant the strong SI, still some residual SI (RSI) remains, which EPSRC-EP/P009549/1.TheworkofK.WangandZ.Dingwassupportedin require further investigation. Further, with regards to the CCI, MSCA-RISE-2015underGrant690750.The associateeditorcoordinatingpartbytheU.K.EPSRCunderGrantEP/L025272/2andinpartbyH2020- while works such as [18] consider that the CCI channels the review of this paper and approving it for publication was Z. Zhang. between UL and DL users are sufficiently weak, [11] considers (Correspondingauthor:SudipBiswas.) a CCI attenuation factor that is assumed to be implemented Engineering,UniversityofEdinburgh,EdinburghEH93FG,U.K.HeisnowK. Singh waswiththeInstituteforDigitalCommunications,Schoolof in prior. Hence, further investigation on the modeling and with the School of Electrical and Electronic Engineering, University College cancellation of CCI channels is mandatory for the successful Dublin(UCD),Dublin4,Ireland(e-mail:[email protected]). implementation of FD systems. Next, with regards to NoMA, Engineering,UniversityofManchester,ManchesterM1 3BB,U.K.(e-mail:K. Wang andZ.DingarewiththeSchoolofElectricalandElectronic until now it has mostly been explored for enhancing the [email protected]; [email protected]). SE [5]– [10], [19], [20] without considering how the transmit S.BiswasandT.Ratnarajah arewiththeInstituteforDigitalCommunica- power can be efficiently utilized to acquire such enhance-U.K.(e-mail:[email protected];[email protected]).tions,SchoolofEngineering,UniversityofEdinburgh,EdinburghEH93FG, ments in SE. Therefore, due to the increasing gap between F. A. Khan is with the School of Computing and Engineering, University battery capacity and power consumption of signal processing ofHuddersfield,HuddersfieldHD13DH,U.K.(e-mail:[email protected]). circuits, energy efficiency (EE) has been considered as a onlineathttp://ieeexplore.ieee.org.Colorversions ofoneormoreof the figures in this paper are available natural performance metric [21]. However, one bottleneck of Digital Object Identifier 10.1109/TWC.2019.2923172 the EE metric is that it severely constrains the system’s 1536-1276 © 2019 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission.
Funding Information:
This work was supported by the U.K. Engineering and Physical Sciences Research Council (EPSRC) under Grant EPSRC-EP/P009549/1. The work of K. Wang and Z. Ding was supported in part by the U.K. EPSRC under Grant EP/L025272/2 and in part by H2020-MSCA-RISE-2015 under Grant 690750.
Publisher Copyright:
© 2002-2012 IEEE.
PY - 2019/9
Y1 - 2019/9
N2 - In this paper, we investigate a full duplex (FD) multi-user non-orthogonal multiple access (NoMA) communication system based on the optimization of received signal-To-interference-plus-noise ratio (SINR) per unit power. Since the communication system operates in the FD mode, co-channel interference (CCI) and self-interference (SI) dominate the system's performance. Accordingly, to combat the CCI, we adopt a game-Theoretic approach and propose users' clustering algorithms and to suppress the SI, we formulate an optimization problem to maximize the power-normalized SINR (PN-SINR). While the user clustering optimization problem is constrained by: 1) the successive interference cancellation (SIC) constraint and 2) two binary constraints for the allocations of uplink (UL) and downlink (DL) users, the PN-SINR problem is constrained by: 1) total transmit power budget at the base station and UL users; 2) the fundamental condition for the implementation of successive interference cancellation in the NoMA; and 3) the minimum fairness condition for the UL users. The original PN-SINR problem is non-convex and hence is converted into an equivalent subtractive-form problem, after which we propose an iterative algorithm to find the optimal power allocation policy. Properties of all the proposed algorithms are thoroughly investigated and the numerical results are provided. Based on the channel conditions and suppression level of SI and CCI, the superiority of the proposed FD-NoMA system over half-duplex NoMA and FD orthogonal multiple access systems is verified.
AB - In this paper, we investigate a full duplex (FD) multi-user non-orthogonal multiple access (NoMA) communication system based on the optimization of received signal-To-interference-plus-noise ratio (SINR) per unit power. Since the communication system operates in the FD mode, co-channel interference (CCI) and self-interference (SI) dominate the system's performance. Accordingly, to combat the CCI, we adopt a game-Theoretic approach and propose users' clustering algorithms and to suppress the SI, we formulate an optimization problem to maximize the power-normalized SINR (PN-SINR). While the user clustering optimization problem is constrained by: 1) the successive interference cancellation (SIC) constraint and 2) two binary constraints for the allocations of uplink (UL) and downlink (DL) users, the PN-SINR problem is constrained by: 1) total transmit power budget at the base station and UL users; 2) the fundamental condition for the implementation of successive interference cancellation in the NoMA; and 3) the minimum fairness condition for the UL users. The original PN-SINR problem is non-convex and hence is converted into an equivalent subtractive-form problem, after which we propose an iterative algorithm to find the optimal power allocation policy. Properties of all the proposed algorithms are thoroughly investigated and the numerical results are provided. Based on the channel conditions and suppression level of SI and CCI, the superiority of the proposed FD-NoMA system over half-duplex NoMA and FD orthogonal multiple access systems is verified.
KW - full duplex
KW - Non-orthogonal multiple access
KW - optimization
KW - power allocation
KW - power-normalized SINR
UR - http://www.scopus.com/inward/record.url?scp=85072161683&partnerID=8YFLogxK
U2 - 10.1109/TWC.2019.2923172
DO - 10.1109/TWC.2019.2923172
M3 - Article
AN - SCOPUS:85072161683
SN - 1536-1276
VL - 18
SP - 4313
EP - 4325
JO - IEEE Transactions on Wireless Communications
JF - IEEE Transactions on Wireless Communications
IS - 9
M1 - 8744489
ER -