Joint Sparse Beamforming and Power Control for a Large-Scale DAS With Network-Assisted Full Duplex

Xia, Xinjiang; Zhu, Pengcheng; Li, Jiamin; Wang, Dongming; Xin, Yuanxue; You, Xiaohu

doi:10.1109/tvt.2020.2994193

Cited by 24 publications

(12 citation statements)

References 29 publications

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“…where sðmÞdenotes the m-th element of vector s, � Q ∈ £ M�M is obtained in the same way as discussed in (7) and ( 8), � G ∈ £ M�G is derived in the way of (10), and γ is a regularisation parameter determined according to the given practical requirements. In the established model, the minimisation of O GL is converted into an equivalent maximisation goal in the objective function, and the constraints of (12) ensure that the single antenna on the m-th platform is provided with maximum power, which is unitary in the expression.…”

Section: Basic Grating Lobe Suppression Model For Fedmentioning

confidence: 99%

“…The transmit beamforming technique can achieve this goal to some extent by main lobe and null control [4][5][6][7][8]. One common method is based on a delay-and-sum (DAS) phased array, and the beam direction is controlled by compensating for the phase shift of each element [9][10][11][12]. However, the transmitted power is focussed on a range of angles.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Grating lobe suppression in focussed energy delivery for precision electronic warfare

Yang

Zhou

et al. 2021

IET Radar Sonar & Navi

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Focussed energy delivery (FED), which transmits energy to a specific area by ultrasparse arrays, is the core technique of precision electronic warfare (PREW). However, array sparsity results in severe grating lobes in practice, which greatly increase the risks of an interference system being attacked and unexpected jamming occurring in other devices. Here, two methods are presented which are aimed at suppressing grating lobes when implementing FED in the application of PREW to avoid the problems mentioned. Regarding the first method, a new metric based on the l ∞ -norm is proposed to measure the maximum grating lobe and introduce the metric to the standard FED model. A multiobjective optimisation problem (MOP) is established and solved by the alternating direction penalty method (ADPM) framework. In the second method, the degrees of freedom of the transmitted signals are extended by equipping each platform with a group of linear uniform antennas. The corresponding MOP is established and block coordinate descent is employed to simplify the problem into two subproblems concerning the amplitude and phase components of the transmitted signals. Then, these two subproblems are solved using Taylor expansion and the ADPM framework. Simulation results are provided to demonstrate the advantages of the proposed methods over the stateof-the-art methods.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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Section: Basic Grating Lobe Suppression Model For Fedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Grating lobe suppression in focussed energy delivery for precision electronic warfare

Yang

Zhou

et al. 2021

IET Radar Sonar & Navi

View full text Add to dashboard Cite

show abstract

“…For downlink transmission, we do not consider the interference cancellation at user terminal side, and we also do not perform the scheduling [11] or user selection [18] to alleviate the uplink-to-downlink interference. Then, in this case, the downlink performance of NAFD is the same as traditional flexible duplex.…”

Section: Downlink Sinr Coverage Analysismentioning

confidence: 99%

Coverage and Spectral Efficiency of Network Assisted Full Duplex in a Millimeter Wave System

He¹,

Zhao

Fan³

et al. 2021

Electronics

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To cope with the growing trend of asymmetric data traffic, we introduce a novel network assisted full duplex (NAFD) for a millimeter wave system. NAFD can dynamically allocate the number of remote radio heads in the uplink mode or in the downlink mode, which can facilitate simultaneous uplink and downlink communications. In this manuscript, we use stochastic geometry to analyze the distribution of the signal-to-interference-plus-noise ratio and the data rate in a NAFD system. The numerical results verify the analysis and show that the NAFD outperforms the dynamic time division duplex system and the traditional flexible duplex system in terms of spectral efficiency.

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“…In [16], authors derived a closed-form expression of spectral efficiency with pilot contamination. By maximizing the aggregated uplink and downlink spectral efficiency with constraints of quality-of service (QoS) and backhaul, [17] designed a method to perform joint downlink beamforming and power control for an NAFD network system. In [18], a transceiver design algorithm is studied with the consideration of maximizing the spectral efficiency while limiting the QoS and backhaul.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Cell-Free Massive MIMO System with Network-Assisted Full-Duplex under Time-Shifting Pilot Scheme

Ma¹,

Fan³

et al. 2022

Electronics

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A network-assisted full-duplex (NAFD) system based on a cell-free (CF) massive multiple-input, multiple-output (MIMO) framework has been proposed to satisfy the demands of higher data transmission rates and efficient communication. However, pilot contamination may occur due to the reuse of pilot sequences in a massive MIMO. With this consideration, we raise an asynchronous channel estimation method based on an uplink and downlink time-shifting pilot-sending scheme, which is able to avoid pilot sequence reuse when obtaining channel state information (CSI), while the data signals could be transmitted simultaneously at the same frequency. The transmission processes of the proposed method above are divided into three phases, including pilot phase, estimation phase, and data phase, in chronological order. When the uplink is in pilot phase, the corresponding downlink is in data phase and vice versa. After the channel state information estimation, both uplinks and downlinks are in data phase. The maximum ratio combination (MRC) receiver and the maximum ratio transmission (MRT) precoding are adopted in the uplink and downlink. The closed-form expressions are derived based on large-scale random matrix theory. We compared our asymptotic results with practical results in simulation, and find that they are well matched. Moreover, the proposed method is superior to the normal time-division duplex (TDD) system.

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Joint Sparse Beamforming and Power Control for a Large-Scale DAS With Network-Assisted Full Duplex

Cited by 24 publications

References 29 publications

Grating lobe suppression in focussed energy delivery for precision electronic warfare

Grating lobe suppression in focussed energy delivery for precision electronic warfare

Coverage and Spectral Efficiency of Network Assisted Full Duplex in a Millimeter Wave System

Performance Analysis of Cell-Free Massive MIMO System with Network-Assisted Full-Duplex under Time-Shifting Pilot Scheme

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