Degrees of Freedom of Millimeter Wave Full-Duplex Systems With Partial CSIT

Vien, V.; Kim, Juyeop; Jeon, Sang-Woon; Choi, Sang Won; Seo, Beomjoo; Shin, Won-Yong

doi:10.1109/lcomm.2016.2536606

Cited by 15 publications

(30 citation statements)

References 10 publications

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“…Since the downlink and IUI channels need to be estimated at mobile user U2 and feed back to the BS. We investigate a common case where the ergodic phase fading, which represents that phase of the downlink and IUI channels are uniformly distributed 49 and full CSI at the BS is available. Assuming that we have the perfect amplitudes of the downlink and IUI channels and their phases obey [0, 2π) uniform distribution, ie,…”

Section: Imperfect Channel Informationmentioning

confidence: 99%

“…In their following work, superposition coding–based IUI cancelation (SCIIC) referenced by the interference suppression method applied in the X‐interference channel was proposed. Mai et al managed the IUI through transmit beamforming in millimeter‐wave FD systems when the BS adopts multiple‐antenna communication systems. Psomas et al exploited the directionality antenna to manage IUI.…”

Section: Introductionmentioning

confidence: 99%

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An interuser interference suppression approach in full‐duplex wireless communications

Zhang

et al. 2018

Trans Emerging Tel Tech

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Considering that a full‐duplex network is composed of a full‐duplex base station (BS) and 2 half‐duplex users, one user transmits on the uplink channel and the other receives through the downlink channel on the same frequency. The uplink user will generate interuser interference (IUI) on the downlink user through the interference channel. In this paper, we propose a novel IUI suppression scheme when the BS knows the full channel state information. The main idea of this scheme is to retransmit the weighted uplink signal as soon as it has been received by the BS. For the narrowband case, we first assess the performance of the proposed scheme through simulation with residual self‐interference at the BS. Specially, we derive the closed‐form expression of the optimum weighted coefficient when self‐interference is perfectly canceled at the BS and then discuss the performance of the proposed IUI suppression scheme in practical considerations. Furthermore, the proposed IUI suppression scheme can be extended to the broadband case using a time‐domain weighted filter. Simulation results show the advantage over existing IUI suppression schemes.

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Section: Imperfect Channel Informationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An interuser interference suppression approach in full‐duplex wireless communications

Zhang

et al. 2018

Trans Emerging Tel Tech

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show abstract

“…Recently, in a full-duplex system composed of a

-antenna full-duplex base stations (BSs) and a large number of single-antenna half-duplex mobile stations (MSs), opportunistic beamforming and scheduling methods were proposed in [ 25 , 26 ]. In [ 25 ], a joint uplink–downlink opportunistic beamforming method was employed so that uplink and downlink sum capacities can be achieved under a certain user scaling condition.…”

Section: Introductionmentioning

confidence: 99%

Revisiting Degrees of Freedom of Full-Duplex Systems with Opportunistic Transmission: An Improved User Scaling Law

Kim

Choi

et al. 2018

Entropy

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Abstract:It was recently studied how to achieve the optimal degrees of freedom (DoF) in a multi-antenna full-duplex system with partial channel state information (CSI). In this paper, we revisit the DoF of a multiple-antenna full-duplex system using opportunistic transmission under the partial CSI, in which a full-duplex base station having M transmit antennas and M receive antennas supports a set of half-duplex mobile stations (MSs) having a single antenna each. Assuming no self-interference, we present a new hybrid opportunistic scheduling method that achieves the optimal sum DoF under an improved user scaling law. Unlike the state-of-the-art scheduling method, our method is designed in the sense that the scheduling role between downlink MSs and uplink MSs is well-balanced. It is shown that the optimal sum DoF of 2M is asymptotically achievable provided that the number of MSs scales faster than SNR M , where SNR denotes the signal-to-noise ratio. This result reveals that, in our full-duplex system, better performance on the user scaling law can be obtained without extra CSI, compared to the prior work that showed the required user scaling condition (i.e., the minimum number of MSs for guaranteeing the optimal DoF) of SNR 2M−1 . Moreover, the average interference decaying rate is analyzed. Numerical evaluation is performed to not only validate our analysis but also show superiority of the proposed method over the state-of-the-art method.

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“…However, for the multiple users situation, where each mobile station is equipped with a single antenna, a finite dimensional channel model with M angular bins can be more applicable to obtain generally correlated or not asymptotically orthogonal channel [15]. The reason is that the finite dimensional channel is able to reflect the property of the poor scattering channel environment caused by high pathloss at high frequency [16] and the angles of arrival at the mobile stations can be neglected.…”

Section: Introductionmentioning

confidence: 99%

“…Unfortunately, the precoding methods in [11] and [16] can not be applied to such a finite dimensional channel. Thus, a low complexity hybrid precoding scheme is proposed for an M -dimensional channel model.…”

Section: Introductionmentioning

confidence: 99%

Low complexity hybrid precoding in finite dimensional channel for massive MIMO systems

Chen

Boussakta

Tsimenidis

et al. 2017

2017 25th European Signal Processing Conference (EUSIPCO)

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Abstract-Massive multiple-input multiple-output (MIMO) is an emerging technology for future wireless networks, scaling up conventional MIMO to an unprecedented number of antennas at base stations. Such a large antenna array has the potential to make the system achieve high channel capacity and spectral efficiency, but it also leads to high cost in terms of hardware complexity. In this paper, we consider a finite dimensional channel model in which finite distinct directions are applied with M angular bins. In massive multi-user MIMO systems, a hybrid precoding method is proposed to reduce the required number of radio frequency (RF) chains at the base station, employing a single antenna per mobile station. The proposed precoder is partitioned into a high-dimensional RF precoder and a lowdimensional baseband precoder. The RF precoder is designed to obtain power gain with phase-only control and the baseband precoder is designed to facilitate multi-stream processing. For realistic scenarios, we consider the situation where the RF phase control is quantized up to B bits of precision. Furthermore, an upper bound on spectral efficiency is derived with the proposed precoding scheme. The simulation results show that hybrid precoding achieves desirable performance in terms of spectral efficiency, which approaches the performance of zero-forcing precoding.

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Degrees of Freedom of Millimeter Wave Full-Duplex Systems With Partial CSIT

Cited by 15 publications

References 10 publications

An interuser interference suppression approach in full‐duplex wireless communications

An interuser interference suppression approach in full‐duplex wireless communications

Revisiting Degrees of Freedom of Full-Duplex Systems with Opportunistic Transmission: An Improved User Scaling Law

Low complexity hybrid precoding in finite dimensional channel for massive MIMO systems

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