Spectral and Energy Efficiency of Multipair Two-Way Full-Duplex Relay Systems With Massive MIMO

Zhang, Zhanzhan; Chen, Zhiyong; Shen, Manyuan; Xia, Bin

doi:10.1109/jsac.2016.2544458

Cited by 147 publications

(130 citation statements)

References 36 publications

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“…All the nodes are equipped with directional antennas. Nodes A and B do not have a direct link, and need to exchange traffic through node R at the same frequency [19], [20]. This scenario is typical in practice, since the three nodes are unaligned in many cases and the directivity of the directional antennas prevents nodes A and B from having a direct link.…”

Section: System Modelmentioning

confidence: 99%

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Energy Efficiency Maximization of Full-Duplex Two-Way Relay With Non-Ideal Power Amplifiers and Non-Negligible Circuit Power

Cui

Zhang

et al. 2017

IEEE Trans. Wireless Commun.

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Abstract-In this paper, we maximize the energy efficiency (EE) of full-duplex (FD) two-way relay (TWR) systems under non-ideal power amplifiers (PAs) and non-negligible transmission-dependent circuit power. We start with the case where only the relay operates full duplex and two timeslots are required for TWR. Then, we extend to the advanced case, where the relay and the two nodes all operate full duplex, and accomplish TWR in a single timeslot. In both cases, we establish the intrinsic connections between the optimal transmit powers and durations, based on which the original non-convex EE maximization can be convexified and optimally solved. Simulations show the superiority of FD-TWR in terms of EE, especially when traffic demand is high. The simulations also reveal that the maximum EE of FD-TWR is more sensitive to the PA efficiency, than it is to self-cancellation. The full FD design of FD-TWR is susceptible to traffic imbalance, while the design with only the relay operating in the FD mode exhibits strong tolerance.Index Terms-Energy efficiency, full-duplex, non-ideal power amplifier, non-negligible circuit power, two-way relay.

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Section: System Modelmentioning

confidence: 99%

“…In [20], four typical power-scaling schemes were proposed to improve the EE of multi-pair AF FD-TWR with a massive antenna array at the relay. With the number of antennas going to infinity, the asymptotic SE and EE were derived.…”

Section: Introductionmentioning

confidence: 99%

Energy Efficiency Maximization of Full-Duplex Two-Way Relay With Non-Ideal Power Amplifiers and Non-Negligible Circuit Power

Cui

Zhang

et al. 2017

IEEE Trans. Wireless Commun.

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“…Since the physical isolation and active analog SI cancellation are performed preliminarily, it is reasonable to assume that the SI can be suppressed greatly [26,28]. The magnitude of the SI channel can be modeled as Rician distribution with LOS SI [29].…”

Section: Channel Modelmentioning

confidence: 99%

“…According to (28), the SE of the SI suppression and channel estimation in the sharedantenna FD massive MU-MIMO can be given as…”

Section: Se and Ee For The Fdmentioning

confidence: 99%

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Self-interference suppression with imperfect channel estimation in a shared-antenna full-duplex massive MU-MIMO system

Xing

Liu

Zhai

et al. 2017

J Wireless Com Network

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In this paper, we consider a shared-antenna full-duplex massive MU-MIMO system and prove that the self-interference (SI) at the base station (BS) can be suppressed, though the direct-path SI exists and the signal/SI channel is imperfectly estimated. The BS is assumed to employ zero-forcing (ZF) or maximal-ratio transmission/maximal-ratio combining (MRT/MRC) method to linearly process signals. We propose a precoded SI channel training scheme by employing orthogonal sequences and downlink precoding, so the SI channel can be estimated like the signal channel with a much lower dimension. Based on the channel estimation, we further analyze the SI suppression by combining the SI removal and the large-scale antenna linear processing (LALP) method. Numerical results show that an additional 36 dB SI can be suppressed by combining the SI removal and the LALP suppression. We derive the tight closed-form lower bounds of the achievable rates for the combined suppression. Finally, we maximize the system spectral efficiency and energy efficiency based on the simulation and closed-form approximations.

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Secure massive MIMO‐enabled full‐duplex 2‐tier heterogeneous networks by exploiting in‐band wireless backhauls

Xie

Jia

Zhou

et al. 2017

Trans. Emerging Tel. Tech.

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To enhance the spectrum efficiency and secrecy performance, by using in‐band full‐duplex (FD) wireless backhaul technique, a secure massive multiple input multiple output (MIMO)–enabled heterogeneous cellular network (HCN) model is presented, where the macro base stations (MBSs) are equipped with massive MIMO antenna array, whereas the small cell base stations (SBSs) and user equipment have the single antenna. The ultradense small cells underlay the macro cells and offload traffic from macro cells. With FD mode, the massive MIMO MBSs and single‐antenna SBSs are responsible, respectively, for the access traffic of macro and small cells as well as the backhaul transmission between MBSs and SBSs over the same time‐frequency resource. The transmissions of macro and small cells are exposed to non‐colluding and passive eavesdroppers that attempt to decode the signals of legitimate users. For such HCN with in‐band wireless backhaul, by modeling the network elements as the independent Possion point processes and using the stochastic geometry, we first investigate the secrecy probabilities of the macro cell downlink and small cell uplink transmissions. At the same time, to achieve a comprehensive view, we also investigate the corresponding signal‐interference‐noise ratio (SINR) coverage performance. The presented numerical results show that when the intensity of user equipment is small relatively, exploiting the in‐band backhaul interference as jamming signals can enhance the secrecy probabilities of both the macro and small cell transmissions so that the in‐band FD backhaul mode outperforms the out‐band FD one. However, for the SINR coverage, the opposite results are achieved. That is to say, the in‐band backhaul transmission degrades the SINR coverage probabilities because of the existence of wireless backhaul interference. Besides of these, in numerical analysis, we also investigate the effect of the network parameters on the secrecy and coverage performance of both the macro and small cells. The derived results can be used for guiding the design of HCNs.

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Spectral and Energy Efficiency of Multipair Two-Way Full-Duplex Relay Systems With Massive MIMO

Cited by 147 publications

References 36 publications

Energy Efficiency Maximization of Full-Duplex Two-Way Relay With Non-Ideal Power Amplifiers and Non-Negligible Circuit Power

Energy Efficiency Maximization of Full-Duplex Two-Way Relay With Non-Ideal Power Amplifiers and Non-Negligible Circuit Power

Self-interference suppression with imperfect channel estimation in a shared-antenna full-duplex massive MU-MIMO system

Secure massive MIMO‐enabled full‐duplex 2‐tier heterogeneous networks by exploiting in‐band wireless backhauls

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