TY - JOUR
T1 - Full-Duplex MIMO Radios
T2 - A Greener Networking Solution
AU - Nguyen, Diep N.
AU - Krunz, Marwan
AU - Dutkiewicz, Eryk
N1 - Funding Information:
This work was supported in part by the Australian Research Council (Discovery Early Career Researcher) under Award DE150101092, and in part by U.S. NSF under Grant IIP-1265960, Grant CNS-1513649, Grant CNS-1563655, and Grant CNS-1731164. Preliminary results in this paper were presented at the IEEE INFOCOM Conference, Hong Kong, 2015 [1].
Funding Information:
Manuscript received July 11, 2017; revised January 8, 2018 and March 21, 2018; accepted April 27, 2018. Date of publication July 4, 2018; date of current version August 16, 2018. This work was supported in part by the Australian Research Council (Discovery Early Career Researcher) under Award DE150101092, and in part by U.S. NSF under Grant IIP-1265960, Grant CNS-1513649, Grant CNS-1563655, and Grant CNS-1731164. Preliminary results in this paper were presented at the IEEE INFOCOM Conference, Hong Kong, 2015 [1]. The associate editor coordinating the review of this paper and approving it for publication was R. Vaze. (Corresponding author: Diep N. Nguyen.) D. N. Nguyen and E. Dutkiewicz are with the Faculty of Engineering and Information Technology, University of Technology Sydney, Sydney, NSW 2007, Australia (e-mail: diep.nguyen@uts.edu.au).
Publisher Copyright:
© 2017 IEEE.
PY - 2018/9
Y1 - 2018/9
N2 - Relative to half-duplex (HD) radios, in-band full-duplex (FD) radios have the potential to double a link's capacity. However, such gain may not necessarily extend to the network-wide throughput, which may actually degrade under FD radios due to excessive network interference. This paper identifies the unique advantages of FD radios and leverages multi-input multioutput (MIMO) communications to translate the FD spectral efficiency gain at the PHY level to the throughput and power efficiency gain at the network layer. We first derive sufficient conditions under which FD-MIMO radios can asymptotically double the throughput of the same network of HD-MIMO ones. Specifically, if a network of 2N HD radios (N links) can achieve a total throughput of dN bps (i.e., d bps per link), then an FD-capable network with the same number of links and network/channel realization can achieve 2N (d-1) bps [i.e., (d-1) bps per direction of a bidirectional link]. To leverage this theoretical gain, we exploit the 'spatial signature' readily captured in the network interference to design an MAC protocol that allows multiple FD links to concurrently communicate while adapting their radiation patterns to minimize network interference. The protocol does not require any feedback nor coordination among nodes. Extensive simulations show that the proposed MAC design dramatically outperforms traditional CSMA-based and the non-orthogonal multiple access protocols with either HD or FD radios with respect to both throughput and energy efficiency. Note that in the literature, network interference is often treated as colored noise that then gets whiten during the signal detection process. However, through our MAC protocol, we emphasize that, unlike random noise, network interference has its own structure that can be 'mined' for 'intelligence' to better align the transceiver's signal.
AB - Relative to half-duplex (HD) radios, in-band full-duplex (FD) radios have the potential to double a link's capacity. However, such gain may not necessarily extend to the network-wide throughput, which may actually degrade under FD radios due to excessive network interference. This paper identifies the unique advantages of FD radios and leverages multi-input multioutput (MIMO) communications to translate the FD spectral efficiency gain at the PHY level to the throughput and power efficiency gain at the network layer. We first derive sufficient conditions under which FD-MIMO radios can asymptotically double the throughput of the same network of HD-MIMO ones. Specifically, if a network of 2N HD radios (N links) can achieve a total throughput of dN bps (i.e., d bps per link), then an FD-capable network with the same number of links and network/channel realization can achieve 2N (d-1) bps [i.e., (d-1) bps per direction of a bidirectional link]. To leverage this theoretical gain, we exploit the 'spatial signature' readily captured in the network interference to design an MAC protocol that allows multiple FD links to concurrently communicate while adapting their radiation patterns to minimize network interference. The protocol does not require any feedback nor coordination among nodes. Extensive simulations show that the proposed MAC design dramatically outperforms traditional CSMA-based and the non-orthogonal multiple access protocols with either HD or FD radios with respect to both throughput and energy efficiency. Note that in the literature, network interference is often treated as colored noise that then gets whiten during the signal detection process. However, through our MAC protocol, we emphasize that, unlike random noise, network interference has its own structure that can be 'mined' for 'intelligence' to better align the transceiver's signal.
KW - Full-duplex
KW - MAC layer
KW - MIMO
KW - Nash equilibrium
KW - capacity
KW - energy efficiency
KW - green communications
KW - networking
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U2 - 10.1109/TGCN.2018.2852956
DO - 10.1109/TGCN.2018.2852956
M3 - Article
AN - SCOPUS:85067529835
VL - 2
SP - 652
EP - 665
JO - IEEE Transactions on Green Communications and Networking
JF - IEEE Transactions on Green Communications and Networking
SN - 2473-2400
IS - 3
M1 - 8403261
ER -