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It is expensive and difficult for the wireless intelligent monitoring equipment of high-voltage transmission lines to get and use electricity. There is a strong and changing magnetic field near the high-voltage transmission lines, which can be transformed into electric energy by induction coil. Firstly, it is necessary to verify whether the magnetic induction intensity is strong enough. Then the electromotive...
Utilization of millimeter-wave bands by next generation mobile networks is expected to make extremely high data rates realizable. However, at such high frequencies, phase noise (PHN) can significantly affect the performance of the communication system. Filter Bank Multi-Carrier systems with Offset Quadrature Amplitude Modulation (FBMC-OQAM) have received increased attention in recent years, but the...
DFT-s-OFDM/Discrete Fourier Transform (DFT) spread Orthogonal Frequency Division Multiplexing (OFDM) is a waveform adopted in the fourth and fifth generation of the mobile communication standards, aiming to combine the merits of Cyclic Prefix (CP) OFDM with a low Peak-to-Average-Power Ratio (PAPR). Due to the growing interest in geometric and probabilistic shaping of the signal constellation, it is...
In this paper, we consider single-link mmWave transmission. We investigate the usual hybrid beamforming architecture under an additional constraint on the analog precoding stage. Namely, for practical reasons only partial interconnection between the antennas and the RF chains is allowed. We present a novel upper bound for spectral efficiency under this architecture constraint. We evaluate the tightness...
Frequency bands above 6GHz are receiving great attention for 5G mobile radio communications due to the potential availability of enormous channel bandwidths. Various multi-carrier and single-carrier waveforms are being considered as potential candidates for 5G radio interface. When evaluating the waveform performance at high carrier frequency and large bandwidths, the inclusion of realistic hardware...
Large absolute channel bandwidths at millimeter wave (mmWave) frequencies and more directional antenna gains may lead to quasi-deterministic (less random) channel fading behavior. Randomness in the cross polarization discrimination (XPD) is an attribute related to the channel fading behavior. In narrow-band channels, it is usually modeled as a log-normal random variable. From channel modeling perspectives,...
Recently, a large scale air pollution problems, such as haze and fog bring challenges for target tracking in computer vision. However, most existing tracking algorithms are far from satisfactory in terms of adaptability to complex scenes and restoring the image's quality for hazy scenes. To address this issue, a particle filter based on context tracking algorithm is proposed for real-world hazy scenes...
A wireless channel is always composed of both deterministic and stochastic multi-path components. A high Rician K-factor increases the contribution of deterministic channel components, thereby reducing the significance of stochastic parts of a channel. This paper focus at the investigative analysis of K-factor and fading depth to analyze the deterministic behavior of a channel under a certain bandwidth...
In the present paper we evaluate the performance of a hybrid digital/analog multi-beam beam-forming architecture with polarization and delay compensation using time reversal (TR). Double-directional, ultra wideband dual-polarized channel measurements at 70 GHz in a conference room have been used to emulate the channel. The use of multiple beams to mitigate human shadowing has been evaluated and the...
In the present paper we analyse small-scale fading of reflections at 60 GHz using different antennas and bandwidths. The aim is to investigate the deterministic property of the channel in view of modelling and deployment of systems with larger bandwidths and higher directivity. We have investigated the scattering effect of a reflection on a wall emulating a beam-former in a NLOS condition. The results...
If a channel is frequency dependent then Uncorrelated Scattering (US) (a narrow-band assumption) don't hold. This has a significant impact at the considered channel modeling methodology as delay and angular dispersion of waves can no longer be studied independently because the small scale fading of individual multipath components become correlated. In this paper, we investigate the frequency dependence...
Millimeter wave (mm-wave) frequencies provide orders of magnitude larger spectrum than current cellular allocations and allow usage of high dimensional antenna arrays for exploiting beamforming and spatial multiplexing. This paper addresses the problem of joint scheduling and radio resource allocation optimization in mm-wave heterogeneous networks where mm-wave small cells are densely deployed underlying...
5th generation cellular systems will extend the operation to above 6 GHz to meet extreme data rate requirements. This sets new requirements for the air interface design. In this paper, we propose several frame structure solutions from the mmMAGIC project [1], which address the challenges of using higher carrier frequencies. These solutions include subframe structures for orthogonal frequency division...
This paper provides a high level comparison of several multi-carrier and single-carrier waveforms based on the evaluations performed in mmMAGIC project. The waveforms are assessed for the performance indicators that are relevant to mobile radio communication above 6 GHz, specially the millimeter wave frequencies. The evaluations are performed in mmMAGIC waveform simulators under common assumptions...
This paper proposes a mainlobe interference suppression method based on whitening filter for distributed array radar (DAR). Due to the equivalent large aperture of DAR, it is possible to cancel the mainlobe interference without target signal suppression. For narrowband signal, the time domain whitening filter (TD-WF) is used. As for the wideband signal or large aperture DAR, the target signals arriving...
In this paper, we propose an interactive image retrieval method based on interactive image segmentation and relevance feedback. For testing the performance of the algorithm, we built an image database by web crawlers, and added a background label to each image by histogram analysis. For image retrieval, an interactive image segmentation scheme based on GrabCut has been applied to get the region of...
Distributed array radar is a significant radar system, which can not only improve radar detection capability and measurement accuracy, but also suppress mainlobe interference effectively. However, due to its equivalent large aperture, the plane wave assumption fails. What's worse, target signals arriving at each array may have the envelope migration problem, thus the traditional adaptive beamforming...
This paper provides an overview and preliminary comparison of several multi-carrier and single- carrier waveforms that are potential candidates for future 5G mobile radio communications above 6 GHz. The waveforms are assessed primarily based on the established and known results as well as recent findings keeping in view the design requirements that are relevant to using frequencies above 6 GHz, especially...
Mobile communication technology has been rapidly evolving ever since its first introduction in the late 1980s. The development witnessed is not just in the refinement of the radio access techniques, but also in the progression towards offering sophisticated features and services to the mobile phone users. To fulfill this ever-growing user demand and market trends, frequency ranges in millimeter wave...
A technical review of energy routers applied in the future energy internet is carried out in this paper. The energy router (E-router) as a critical equipment of the energy internet can better solve changes of the power dispatching and management caused by a variety of distributed renewable energy sources accessing to low-voltage distribution networks. Basic design considerations and components of...
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