Degrees of Freedom of the Full-Duplex Asymmetric MIMO Three-Way Channel with Unicast and Broadcast Messages
| Author | Elmahdy, A.M. |
| Author | El-Keyi, A. |
| Author | Mohasseb, Y. |
| Author | Elbatt, T. |
| Author | Nafie, M. |
| Author | Seddik, K.G. |
| Author | Khattab, T. |
| Available date | 2021-01-25T06:45:45Z |
| Publication Date | 2017 |
| Publication Name | IEEE Transactions on Communications |
| Resource | Scopus |
| ISSN | 906778 |
| Abstract | In this paper, we characterize the total degrees of freedom (DoFs) of the full-duplex asymmetric multiple-input multiple- output (MIMO) three-way channel. Each node has a separate-antenna full-duplex MIMO transceiver with a different number of antennas, where each antenna can be configured for either signal transmission or reception. We study this system under two message configurations; the first configuration is when each node has two unicast messages to be delivered to the two other nodes, while the second configuration is when each node has two unicast messages as well as one broadcast message to be delivered to the two other nodes. For each configuration, we first derive upper bounds on the total DoF of the system. Cut-set bounds in conjunction with genie-aided bounds are derived to characterize the achievable total DoF. Afterward, we analytically derive the optimal number of transmit and receive antennas at each node to maximize the total DoF of the system, subject to the total number of antennas at each node. Finally, the achievable schemes for each configuration are constructed. The proposed schemes are mainly based on zero-forcing and null-space transmit beamforming. We show that the derived outer and inner bounds on the total DoF are tight for each message configuration. |
| Sponsor | Manuscript received June 8, 2016; revised December 5, 2016; accepted January 19, 2017. Date of publication February 8, 2017; date of current version August 14, 2017. The research work of A. M. Elmahdy and T. ElBatt was made possible by grants number NPRP 4-1034-2-385 and NPRP 5-782-2-322 from the Qatar National Research Fund, QNRF (a member of Qatar Foundation, QF). The research work of A. El-Keyi, M. Nafie and T. Khattab was made possible by grant number NPRP 7-923-2-344 from the QNRF. The statements made herein are solely the responsibility of the authors. This work was presented at the IEEE Information Theory Workshop (ITW), Cambridge, UK, Sept. 2016 [1]. The associate editor coordinating the review of this paper and approving it for publication was A. Tajer. |
| Language | en |
| Publisher | Institute of Electrical and Electronics Engineers Inc. |
| Subject | Degrees of freedom full-duplex communications MIMO multi-way channels |
| Type | Conference Paper |
| Pagination | 3276-3287 |
| Issue Number | 8 |
| Volume Number | 65 |
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