Full Duplex emulation via spatial separation of Half Duplex nodes in a planar cellular network

Thomsen, Henning; Kim, Dong-Min; Popovski, Petar; Pratas, Nuno K.; Carvalho, Elisabeth de

doi:10.1109/spawc.2016.7536747

Cited by 11 publications

(7 citation statements)

References 10 publications

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“…Coordinated multi-point transmissions (CoMP) for in-band wireless full-duplex (CoMPflex) was proposed in [7], by considering emulation of a full-duplex cellular base-station (BS) and using two spatially separated and coordinated half-duplex BSs. The simulation results in [8] have shown that due to the increased density of BSs, the outage performances of both uplink and downlink in CoMPflex are better than that in cellular systems with CCFD BSs. Large-scale antenna systems, including massive MIMO systems and large-scale distributed antenna systems (DAS) [9]- [12], could enable duplexing approaches over the spatial domain [13]- [15].…”

Section: Introductionmentioning

confidence: 99%

Performance of Network-Assisted Full-Duplex for Cell-Free Massive MIMO

Wang

Zhu

et al. 2020

IEEE Trans. Commun.

112

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Network assisted full-duplex (NAFD) is a spatial-division duplex technique for future wireless networks with cellfree massive multiple-input multiple-output (CF massive MIMO) network, where a large number of remote antenna units (RAUs), either using half-duplex or full-duplex, jointly support truly flexible duplex including time-division duplex, frequency-division duplex and full duplex on demand of uplink and downlink traffic by using network MIMO methods. With NAFD, bi-directional data rates of the wireless network could be increased and end-to-end delay could be reduced. In this paper, the spectral efficiency of NAFD communications in CF massive MIMO network with imperfect channel state information (CSI) is investigated under spatial correlated channels. Based on large dimensional random matrix theory, the deterministic equivalents for the uplink sum-rate with minimum-mean-square-error (MMSE) receiver as well as the downlink sum-rate with zero-forcing (ZF) and regularized zero-forcing (RZF) beamforming are derived. Numerical results show that under various environmental settings, the deterministic equivalents are accurate in both a large-scale system and system with a finite number of antennas. It is also shown that with the downlink-touplink interference cancellation, the uplink spectral efficiency of CF massive MIMO with NAFD could be improved.The spectral efficiencies of NAFD with different duplex configurations such as in-band full-duplex, and half-duplex are compared. With the same total numbers of transmit and receive antennas, NAFD with half-duplex RAUs offers a higher spectral efficiency. To alleviate the uplink-to-downlink interference, a novel genetic algorithm based user scheduling strategy (GAS) is proposed. Simulation results show that the achievable downlink sum-rate by using the GAS is greatly improved compared to that by using the random user scheduling. Index TermsNetwork-assisted full-duplex, cell-free massive MIMO, full-duplex, spectral efficiency, deterministic equivalent, scheduling Recently, a novel concept called cell-free (CF) massive multiple-input multiple-output (MIMO) was proposed to overcome the inter-cell interference by innovating the cellular architecture [18], [19]. Compared to small-cell network, CF massive MIMO potentially has a large spectral efficiency [19]. From the point of view of baseband transmission, the performance gain of CF massive MIMO comes from the joint processing of a large number of geographically distributed RAUs [20]. Our recent prototyping system in large-scale distributed MIMO has demonstrated that the data rate of 10Gbps could be achieved by a 128x128 large-scale distributed MIMO (or CF massive MIMO) with 100MHz bandwidth [21]. Different from the existing works, in this paper, we propose a network-assisted full duplex (NAFD) to unify the flexible duplex, hybrid-duplex, full-duplex, and other duplex methods [7], [14], [15], [22] under the CF massive MIMO network, and solve the CLI problem to achieve truly flexible duplex, which is essential in the 5G NR [...

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Section: Introductionmentioning

confidence: 99%

Performance of Network-Assisted Full-Duplex for Cell-Free Massive MIMO

Wang

Zhu

et al. 2020

IEEE Trans. Commun.

112

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“…Recently, several SIC techniques have been exploited to achieve improved interport isolation between T x and R x ports of IBFD antennas. Such techniques include spatial duplexing (physical separation of T x and R x antennas) [13], [14], polarization diversity [15]- [20], performing near field SIC [21]- [23], and hybrid techniques based on utilizing different modes and polarizations [24]. The spatial duplexing achieves the isolation (reduced coupling) by exploiting the free space path loss dependence upon spatial separation (inter-antenna spacing) between T x and R x antennas or through spatially separated directional beams.…”

Section: Introductionmentioning

confidence: 99%

Single Layer, Differentially Driven, LHCP Antenna With Improved Isolation for Full Duplex Wireless Applications

et al. 2019

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This paper presents a unidirectional, left handed circularly polarized (LHCP), single layered antenna array with improved interport isolation for simultaneous transmit and receive (STAR) or in-band full duplex (IBFD) wireless applications. The proposed IBFD antenna is comprised of three identical and sequentially rotated LHCP radiating elements where two R x patches are symmetrically placed with respect to a single T x patch. The symmetry of proposed antenna structure results in same amount of coupling or self interference (SI) from T x element and differentially driven R x patches achieve effective suppression of resulting SI to obtain improved T x-R x interport isolation required for STAR applications. The deployed feed network for differential-driven R x operation is composed of a simple 3dB/180 • rat-race coupler (ring hybrid coupler) with nice in-band amplitude and out-of-phase balance characteristics. The implemented single layer, compact (antenna elements and feeding network etched on single-layered PCB) antenna array achieves 10dB return-loss bandwidth ≥ 75MHz for both T x and R x ports. The prototype achieves ≥ 47dB interport isolation in 75MHz bandwidth and 3 dB axial ratio beam-width is ∼ 60 • for implemented antenna. INDEX TERMS Left hand circular polarized (LHCP) antenna, improved interport isolation, in-band full duplex, self interference cancellation (SIC), 3dB/180 • ring hybrid coupler.

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“…Various antenna designs with high interport isolation have been reported in literature which are based on different SIC techniques to improve the interport isolation . The employed isolation techniques include spatial isolation (physical separation of antenna elements), the polarization diversity isolation, reduction in coupling through near field SIC and using different modes for isolation . The spatial isolation techniques are used for bistatic antenna (separate antenna for T x and R x modes) configurations.…”

Section: Introductionmentioning

confidence: 99%

“…The differential excitation is a very effective near filed SIC technique to achieve high isolation between T x and R x port of monostatic antenna without disturbing its radiation characteristics. The differential feeding can be employed either at single port or at both ports simultaneously . However, the achievable isolation levels through differentially driven antennas are highly dependent upon the amplitude and out‐of‐phase balance characteristics of differential circuit.…”

Section: Introductionmentioning

confidence: 99%

A compact proximity‐fed 2.4 GHz monostatic antenna with wide‐band SIC characteristics for in‐band full duplex applications

Nawaz

Niazi

2019

Int J RF Microw Comput Aided Eng

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This article presents a dual polarized, proximity-fed monostatic patch antenna (single radiator for both transmit and receive modes) with improved interport isolation for 2.4 GHz in-band full duplex (IBFD) applications. The proximityfed radiating patch offers comparatively wider impedance bandwidth for presented design. Very nice self-interference cancelation (SIC) levels for intended impedance bandwidth have been achieved through differential receive (R x ) mode configuration. The differential R x mode based on 180 ring hybrid coupler acts as a signal inversion mechanism for effective suppression or cancelation of in-band self-interference (SI) that is, the leakage from transmit port. The implemented prototype of proposed antenna achieves ≥87 dB peak isolation for dual polarized IBFD operation. Moreover, the recorded interport isolation for validation model ≥60 dB within 10 dB-return loss bandwidth of 90 MHz (2.36-2.45 GHz). The measured radiation characteristics of implemented antenna demonstrate nice gain and low cross-polarization levels for both transmit (T x ) and receive (R x ) modes. The dimensions of implemented antenna are 70 × 75 × 4.8 mm 3 . The novelty of this work is wide-band SIC performance for monostatic antenna configuration with compact structure of presented design. K E Y W O R D SDC interport isolation, differential feeding, dual polarization, full duplex antenna, high interport isolation, self-interference cancelation (SIC)

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Full Duplex emulation via spatial separation of Half Duplex nodes in a planar cellular network

Cited by 11 publications

References 10 publications

Performance of Network-Assisted Full-Duplex for Cell-Free Massive MIMO

Performance of Network-Assisted Full-Duplex for Cell-Free Massive MIMO

Single Layer, Differentially Driven, LHCP Antenna With Improved Isolation for Full Duplex Wireless Applications

A compact proximity‐fed 2.4 GHz monostatic antenna with wide‐band SIC characteristics for in‐band full duplex applications

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