TY - JOUR
T1 - Half-Duplex or Full-Duplex Communications
T2 - Degrees of Freedom Analysis under Self-Interference
AU - Shende, Nirmal V.
AU - Gürbüz, Özgür
AU - Erkip, Elza
N1 - Funding Information:
Manuscript received August 23, 2017; accepted November 5, 2017. Date of publication November 21, 2017; date of current version February 9, 2018. This work was supported in part by NSF under Grant 1527750 and in part by TUBITAK under Grant 113E222. This paper was presented in part at the Conference on Information Sciences and Systems, March 2013 [1]. The associate editor coordinating the review of this paper and approving it for publication was B. Natarajan. (Corresponding author: Nirmal V. Shende.) N. V. Shende is with the School of Electrical and Computer Engineering, Cornell University, Ithaca, NY 14853 USA (e-mail: nvs25@cornell.edu).
Publisher Copyright:
© 2017 IEEE.
PY - 2018/2
Y1 - 2018/2
N2 - In-band full-duplex (FD) communication provides a promising alternative to half-duplex (HD) for wireless systems, due to increased spectral efficiency and capacity. In this paper, HD and FD radio implementations of two way, two hop, and two way two hop communication are compared in terms of degrees of freedom (DoF) under a realistic residual self-interference (SI) model. DoF analysis is carried out for each communication scenario for HD, antenna conserved (AC), and RF chain conserved (RC) FD radio implementations. The DoF analysis indicates that for the two way channel, the achievable AC FD with imperfect SI cancellation performs strictly below HD, and RC FD DoF tradeoff is superior when the SI can be sufficiently cancelled. For the two hop channel, FD is better when the relay has a large number of antennas and enough SI cancellation. For the two way two hop channel, when both nodes require similar throughput, the achievable DoF pairs for FD do not outperform HD. FD still can achieve better DoF pairs than HD, provided the relay has sufficient number of antennas and SI suppression.
AB - In-band full-duplex (FD) communication provides a promising alternative to half-duplex (HD) for wireless systems, due to increased spectral efficiency and capacity. In this paper, HD and FD radio implementations of two way, two hop, and two way two hop communication are compared in terms of degrees of freedom (DoF) under a realistic residual self-interference (SI) model. DoF analysis is carried out for each communication scenario for HD, antenna conserved (AC), and RF chain conserved (RC) FD radio implementations. The DoF analysis indicates that for the two way channel, the achievable AC FD with imperfect SI cancellation performs strictly below HD, and RC FD DoF tradeoff is superior when the SI can be sufficiently cancelled. For the two hop channel, FD is better when the relay has a large number of antennas and enough SI cancellation. For the two way two hop channel, when both nodes require similar throughput, the achievable DoF pairs for FD do not outperform HD. FD still can achieve better DoF pairs than HD, provided the relay has sufficient number of antennas and SI suppression.
KW - Multiple-input multiple-output (MIMO)
KW - degrees of freedom (DOF)
KW - full-duplex (FD)
KW - self-interference (SI)
KW - two-hop
KW - two-way
KW - two-way two-hop
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U2 - 10.1109/TWC.2017.2774823
DO - 10.1109/TWC.2017.2774823
M3 - Article
AN - SCOPUS:85035754323
SN - 1536-1276
VL - 17
SP - 1081
EP - 1093
JO - IEEE Transactions on Wireless Communications
JF - IEEE Transactions on Wireless Communications
IS - 2
M1 - 8116642
ER -