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An 8-port planar UWB MIMO antenna is proposed for 5G micro wireless access point applications in this paper. The proposed antenna is formed by integrating three monopole strips with different structures and resonant modes, thereby resulting in a much wider bandwidth to cover UWB high band (5.15–10.6 GHz) with S11 lower than −10 dB. High isolation (lower than −15 dB) and low ECC (lower than 0.02) are...
Multiple-input multiple-output (MIMO) radar is of great research interest in recent years. The impacts of inherent bistatic geometry of a MIMO array on target images might be severe at short distances. This is due to the fact that each virtual element synthesized by a MIMO array cannot be considered as a mono-static transmit/receive element. In this paper, we study the characteristics of near-field...
This paper investigates potential advantages of linear irregular sparse antenna arrays over their regular counterparts in a mm-wave line-of-sight (LOS) multiple-input multiple-output (MIMO) scenario. The comparison is based on numerical computations of MIMO eigenvalues of the corresponding channel matrices and the resulting channel capacity. Identical linear antenna arrays are assumed at the transmitter...
This paper talks about the most problematic issues brought by interferences in the New Generation Networks and their impact on the network s data throughput with focus on the inter-cell interferences. The most important ways to avoid interferences while planning a network are mentioned. In particular frequency reuse, power control and MIMO antenna arrays. Also, interference regeneration and cancelation...
In this paper, a dual-element MIMO antenna without adding any decoupling structure is presented. The MIMO antenna consists of two symmetric inverted-L elements with the antenna spacing of only 9 mm (0.1 λ at 3.5 GHz). The isolation between antennas is reduced by pattern diversity. |S11| < −10 dB and |S21| < −16 dB are achieved over the band from 3.48–3.6 GHz. Compared with the antenna without...
In this study we present a new MIMO antenna which utilizes the metal frame of a smartphone. This antenna contributes to high mechanical strength which can help prevent the display from cracking when the smartphone is dropped. The antenna can generate multi resonant mode at about 0.9 GHz band as well as at 1.5 to 2.2 GHz bands. The operating mode at 0.9 GHz and 2.0 MHz is a loop antenna. At 1.5 GHz...
A problem that arises with pilot assignment in multicellular massive multiple-input-multiple-output (MIMO) systems is due to inter-cell interference, also known as pilot contamination. This paper focuses on minimizing the inter-cell interference that results from spatial correlation based on signal arrival parameters, assuming the use of a cylindrical antenna array. The signal parameters are used...
This paper deals with an effective method to maximize the characteristics of a MIMO antenna system for cars. This stems from the improvement of isolation between the two radiators. A metamaterial kind of decoupling device which is a modified SRR curbs the unwanted interaction between the MIMO elements. New flat dual-band monopoles with the interference-reduction device for the MIMO system are suggested...
In this paper, a miniaturized MIMO antenna for smart glasses is proposed. The proposed MIMO antenna is designed using T-shaped isolator inserted between two closely located Inverted-F Antenna and using two slots located in the ground for isolation enhancement and impedance matching characteristic. The proposed antenna has only the overall dimensions of 35mm×9mm×0.8mm and operates in the 2.4 GHz ISM...
This paper presents the concept of using a multisensor radio-frequency (RF) system for the detection and tracking of the ball and players in ball sports. The system will be designed as a supporting system for video based tracking systems. The system will consist of two subsystems using RFID and radar technology to detect the position and velocity parameters of the players and ball in sports such as...
Presented is a method to produce a 2D reference test zone for over-the-air measurements in a random line-of-sight environment for vehicular applications. The ideal threshold receiver model is used to design the chamber array at 3 GHz for LTE/LTE-A systems. The analysis focuses on the fluctuations of the reference power measurements at a user-defined probability of detection level of bit-streams. Numerical...
Motivated by recent drastic advances in the study of linear-time invariant (ETI) positive systems, we explore analysis techniques of general, not necessarily positive ETI systems using positive system theory. Even though a positive system is characterized by its peculiar property that its impulse response is nonnegative, we often deal with nonnegative impulse responses even in general ETI system analysis...
Reduced-complexity implementations are critical for massive MIMO (Multiple Input, Multiple Output) systems. In this paper we consider the uplink of broadband massive MIMO systems employing SC-FDE (Single-Carrier with Frequency-Domain Equalization) schemes, where multiple users transmit to a single base station with a large number of antennas. We propose low-complexity frequency-domain detection schemes...
In this paper, we present a Vehicular version of the Shared UE-side Distributed Antenna System (SUDAS) i.e. Vehicular SUDAS which enables high throughput wireless communication in high mobility Vehicle-to-X (V2X) scenarios. Vehicular SUDAS uses shared virtual antennas, termed UE-side Radio Units (URUs), which utilize both licensed sub-6 GHz band and unlicensed millimetre wave band, to achieve a virtual...
This paper presents a model-free simultaneous design method of multiloop PID controllers for two-input-two-output (TITO) interactive processes with time delays. The controller design directly exploits experimental process data without identifying process models. By employing the virtual reference approach, structure of the reference model matrix achievable by the multiloop control scheme is derived...
MIMO technology is expected to play a key role in the endeavour to reach the capacity target of 5G systems, in conjunction with the use of frequencies above 6 GHz. This communication paradigm is anticipated to be utilised also in the wireless backhaul domain, in order to meet the high capacity requirements of the future wireless transport networks. The performance of the considered MIMO transmission...
Liquid crystal polymer (LCP) substrates are used to design 3D conformal antenna elements in laser direct structuring technology (LDS) for MIMO and phased-array applications. Perspectives for energy-oriented built-in-self-test (BIST) compensation solutions are drawn for multiphysics electromagnetic-thermal-mechanical co-design of chip-package-PCB systems undergoing stochastic changes in their integration...
Nowadays the Massive MIMO system is one of the keys for obtaining high quality and reliability of data transmission. One of the main characteristics influencing the MIMO system performance is the channel (system) correlation matrix (CM). The proposed research assumes an exponential-type banded CM structure, which is bridging the gap between fully correlated and uncorrelated/weakly correlated (tridiagonal...
The aim of this paper is to introduce the measurement method for challenging Non-Line of Sight (NLOS) conditions in mobile networks. The need to develop the measurement method appeared LTE (Long Term Evolution) uplink (UL) performance with different antenna technologies when receiving NLOS signal in field tests. Many challenges appeared during the study. This paper introduces the challenges and presents...
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