Performance Analysis of Large Multiuser MIMO Systems With Space-Constrained 2-D Antenna Arrays

Biswas, Sudip; Masouros, Christos; Ratnarajah, Tharmalingam

doi:10.1109/twc.2016.2522419

Cited by 66 publications

(67 citation statements)

References 35 publications

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“…A proof-of-concept array was constructed and tests were performed that validate the reported design principles and simulation results. M. (5G) communication systems [1,2]. It has several unique advantages that arise from its ability to facilitate the presence of additional signal channels instead of requiring the use of extra frequency spectrum or power.…”

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confidence: 99%

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Mutual Coupling Reduction Using Meta-Structures for Wideband, Dual-Polarized, and High-Density Patch Arrays

Tang

Chen

Wang

et al. 2017

IEEE Trans. Antennas Propagat.

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-A mutual coupling reduction strategy that employs meta-structures is introduced for wideband, dual-polarized, high-density, planar, patch antenna arrays. The meta-structures consist of two types of resonators: grounded capacitively loaded loops (GCLLs) and π-shaped elements. By incorporating the meta-structures into the array configuration, the isolation levels between adjacent radiating elements in both the E-and H-plane orientations are improved by as much as 7.15 dB. The surface current distribution behaviors of the array with only the GCLLs and with only the π-shaped elements are investigated thoroughly to explain the mutual coupling reduction mechanisms. A proof-of-concept array was constructed and tests were performed that validate the reported design principles and simulation results. M. (5G) communication systems [1,2]. It has several unique advantages that arise from its ability to facilitate the presence of additional signal channels instead of requiring the use of extra frequency spectrum or power. Benefits include being able to increase the data capacity and to make the system more adaptable. Index TermsMIMO approaches are based on antenna arrays. With the ever increasing demand for more capacity, it is anticipated that massive MIMO will be central to 5G systems; and it will be facilitated by compact dense arrays. However, strong inter-element coupling occurs when the element spacing is small; it dramatically increases the spatial correlations and seriously deteriorates the signal-to-interference-plus-noise -ratio (SINR) [3]. Consequently, mutual coupling effects between array elements have attracted intense attention.There exist a plethora of reported approaches that are capable of reducing the mutual coupling in the physical layer. However, because of known fundamental physical limitations [4], it cannot be eliminated completely. Nevertheless, mutual coupling reduction can significantly improve the performance of MIMO systems.In general, the existing, most widely used mutual coupling reduction strategies can be classified into the following three categories. One approach focuses on introducing a variety of compact isolation elements between the radiators. The choices have been rather diverse. They include parasitic elements, such as monopoles [5], scatterers [6], and radiation patches [7]. Also, they include electromagnetic band-gap (EBG) structures, such as mushroom-like EBG structures [8], F-shaped EBG structures [9], and uniplanar compact EBG structures [10,11]. Defected ground structures (DGSs), such as periodic rectangular slits [12], back-to-back U-shaped slots [13], T-shaped slots [14], and loop slots [15] have also been used. More recently, numerous metamaterial-inspired structures have been considered, such as folded single split ring resonators [16], grounded split-ring resonators (GSRRs) [17], multiple split-ring resonators (MSRRs) [18] While the above strategies have reduced mutual coupling, one witnesses certain drawbacks accompanying each of them. As a result, their widespre...

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confidence: 99%

“…(5G) communication systems [1,2]. It has several unique advantages that arise from its ability to facilitate the presence of additional signal channels instead of requiring the use of extra frequency spectrum or power.…”

mentioning

confidence: 99%

Mutual Coupling Reduction Using Meta-Structures for Wideband, Dual-Polarized, and High-Density Patch Arrays

Tang

Chen

Wang

et al. 2017

IEEE Trans. Antennas Propagat.

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“…For any two antenna elements n and n , where θ ∈ [0, π) is an arbitrary elevation angle and p Θ (θ) is constant over [0, π), we have θ exp (j2πdz n,n cos (θ)) J 0 (2πdxy n,n sin (θ)) p Θ (θ) × sin (θ) dθ = A π 0 exp (j2πdz n,n cos (θ)) × J 0 (2πdxy n,n sin (θ)) p Θ (θ) sin (θ) dθ, (32) where A is the scaling constant to make sure the elevation PDF integrates to 1. To calculate A, we have 1 = exp (−j2πdz n,n u) I 0 j2πdxy n,n 1 − u 2 du (34) = sinh (j2πdz n,n ) 2 + (j2πdxy n,n ) 2 (j2πdz n,n ) 2 + (j2πdxy n,n )…”

Section: Appendix B Proof Of Theoremmentioning

confidence: 99%

“…This effect can be critical in physically constrained scenarios, where a large number of antennas are packed in fixed physical structures such that inter-antenna spacings are shorter than half a wavelength, as studied in [17], [32]. Specifically, [32] shows a considerable decrease in the achievable rates of microwave systems due to MC. Overall, the influence of both MC and array topology in the mmWave band still remains an open problem [13].…”

Section: Introductionmentioning

confidence: 99%

On the Performance of Spatially Correlated Large Antenna Arrays for Millimeter-Wave Frequencies

Neil

García‐Rodríguez

Smith

et al. 2018

IEEE Trans. Antennas Propagat.

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Abstract-A spatially correlated large antenna array operating at millimeter-wave (mmWave) frequencies is considered. Based on a Saleh-Valenzuela channel model, closed-form expressions of the three-dimensional spatial correlation (SC) for wide, narrow and Von Mises power elevation spectra (PES) are analytically derived. The effects of the PES on the convergence to massive multipleinput-multiple-output (MIMO) properties is then illustrated by defining and deriving a diagonal dominance metric. Numerically, the effects of antenna element mutual coupling (MC) is shown on the effective SC, eigenvalue structure and mmWave user rate for different antenna topologies. It is concluded that although MC can significantly reduce SC for side-by-side dipole antenna elements, the change in antenna effective gain (and therefore signal-to-noise ratio) caused by MC becomes a dominating effect and ultimately determines the antenna array performance. The user rate of a mmWave system with hybrid beamforming (HBF), using an orthogonal matching pursuit (OMP) algorithm, is then shown for different antenna topologies with dipole and crosspolarized (x-pol) antenna elements. It is seen that even for small numbers of radio-frequency chains, the OMP algorithm works well relative to the fully digital case for channels with high SC, such as the x-pol antenna array.

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“…In [1] it was stated that very large antenna arrays may not be useful when the antennas are deployed within a fixed physical space. However, the smaller wavelengths of mmWave bands will make it possible to rig a large number of antennas in constrained physical spaces.…”

Section: Introductionmentioning

confidence: 99%

On the Performance of mmWave Networks Aided by Wirelessly Powered Relays

Biswas

Vuppala

Ratnarajah

2016

IEEE J. Sel. Top. Signal Process.

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Abstract-We investigate the energy harvesting (EH) potential of an outdoor millimeter-wave (mmWave) network aided by wirelessly powered relays (WRs). Due to the effect of propagation characteristics, such as blockages, WRs can assist the coverage in mmWave networks. In this paper, we consider the WRs to be equipped with battery units that can store ambient RF energy from the mmWave sources. The sources and the WRs are modeled as independent homogeneous Poisson point processes (PPPs). Leveraging tools from stochastic geometry, we study the EH potential of the WRs and their coverage probability based on the amount of energy that can be harvested. To successfully receive and transmit, the batteries in the WRs have to store sufficient energy, while the received signal to interference plus noise (SINR) ratio at the destination is above a certain threshold level. We also analyze the node isolation and network connectivity probabilities for the WRs considering a bounded region. Based on this bounded region of the WRs, we then select the best WR to forward the message from sources to the destination. Furthermore, the coverage probability is also analyzed for the WRs residing both within and outside the bounded region.

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Performance Analysis of Large Multiuser MIMO Systems With Space-Constrained 2-D Antenna Arrays

Cited by 66 publications

References 35 publications

Mutual Coupling Reduction Using Meta-Structures for Wideband, Dual-Polarized, and High-Density Patch Arrays

Mutual Coupling Reduction Using Meta-Structures for Wideband, Dual-Polarized, and High-Density Patch Arrays

On the Performance of Spatially Correlated Large Antenna Arrays for Millimeter-Wave Frequencies

On the Performance of mmWave Networks Aided by Wirelessly Powered Relays

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