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Different from electric current, the magnetic current can't be supported on a piece of metallic wire or similar structures. It is usually designed as an equivalent concept using electric small loops. In this paper, we have proposed a method to synthesize the magnetic current in a simple but not trivial structure, compared with the existing ways. A cavity is utilized to provide an aperture to perform...
A Massive MIMO system is equipped with more antennas than traditional MIMO system. Channel modeling for MIMO system has been well studied. However, study for Massive MIMO system channel modeling has just begun. In this paper, we prove the correctness of the spherical wave assumption and the non-stationary properties on both time and array axes. Then, we propose a novel twin-multi-ring channel model...
A dual-resonant quad-layer transmitarray element is proposed in this paper. The element can be used to construct a circularly polarized transmitarray which converts linearly polarized incident wave into circularly polarized outgoing wave. The element operates at 30GHz and is designed through the principle of multilayer frequency selective approach [1]. By varying the element's dimensions, a full transmission...
In this work we describe our investigation into wideband channel models for the acoustic water pipe channel operating over the 10–50KHz frequency band. We provide experimental results for a straightforward water pipe system consisting of a single pipe of length 6.3m, diameter 7.1cm, constructed from PVC and terminated with water tanks at each end in a hydrostatic configuration. It is observed that...
Dense small cell deployment is promising to accommodate the explosive growth of cellular traffic, anticipated to have a 1000-fold increase in the following decade, driven by the Internet-of-Things (IoT). Different from traditional cellular traffic, emerging IoT applications will generate a large amount of uplink traffic. Considering uplink, how many small cells should be deployed and where they should...
A novel three-dimensional (3-D) folded slot antenna is presented in this paper. By bending the planar slot antenna into a U-shaped slot antenna, quasi-isotropic radiation pattern is achieved in the full space. The volume of the proposed antenna is 11×22×22 mm3. Comparison between the planar and the folded antennas is discussed in detail. Simulated results show that the −10 dB impedance bandwidth of...
Experiment on channel propagation characteristic in underground iron mine was reported in this paper. Our work was carried out by CC1110-based Wireless Sensor Networks (WSN). The measured data verifies robustness and reliability of the system, which highlights the potential of underground personnel positioning system consisting of WSN-based backbone architecture.
With the fast development of Wireless Sensor Networks (WSNs) and RFID technology, many Internet of Things (IOT) applications have been deployed in recent years. Smart home energy management systems form part of the smart grid program and are a fast developing smart home application area. Inadequate security is a big issue in smart home energy management systems. Most security protocols widely used...
Next generation network on the high speed train is aimed to achieve high mobility, broadband and large data rates as required. However, the wireless signal has been proved instable due to high doppler shift, poor weather conditions and various geography environment. In this context, the e-business on the high speed train has to face a few e-business quality problems for wavy data rates and transmission...
Due to the rapid growth of mobile networks, many advanced applications have been deployed. However, security of data will be an important factor for their full adoption. Most of these applications will be utilized on resource constrained devices, which makes security protocols currently used in wired networks not fully applicable to mobile networks. Recently, a number of key agreement protocols have...
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