Directional antennas offer many potential advantages for wireless networks such as increased network capacity, extended transmission range and reduced energy consumption. Exploiting these advantages requires new protocols and mechanisms at various communication layers to intelligently control the directional antenna system. With directional antennas, many trivial mechanisms, such as neighbor di...

In this paper, we propose a localization method using iterative angle of arrival (AOA) method sharing snapshots of coherent subarrays. The conventional AOA method is restricted in some applications because array antenna used for receivers requires many antennas to improve localization accuracy. The proposed method improves localization accuracy without increasing elements of antenna arrays, and...

Abstract—Massive multiple-input multiple-output (MIMO) is a transmission technique for cellular systems that uses many antennas to support not-as-many users. Thus far, the performance of massive MIMO has only been examined in finite cellular networks. In this letter, we analyze its performance in random cellular networks with Poisson distributed base station locations. Specifically, we provide ...

Due to the applications in meteorological broadcasts, radio navigation, and underwater communications, low-frequency (LF) receiving antennas have been actively studied. However, because frequency range of LF antenna is 30 300 kHz, its electromagnetic wavelength 1 10 km, which makes difficult be implemented miniaturized or portable devices. This article presents a magnetoelectric (ME) with an in...

One of the important issues in many of array systems such as Radar, Sonar, Mobile, and satellite telecommunications is the estimation of DOA of narrowband received signal. CRB is very important in evaluation of parameter estimation. CRB is the lower bound estimation error variance for any unbiased estimation. In this paper, the array antenna with equal distance arrays is extended in two separat...

This paper proposes new closed expressions of self-impedance using the Method Moments with Point Matching Procedure and piecewise constant linear basis functions in different configurations, which allow saving computing time for solution wire antennas complex geometries. The have complexity O(1) well-defined theoretical bound errors. They were compared an adaptive numerical integration. We obta...

The transient electric field radiated from a thin-wire dipole antenna resistively loaded and excited by a voltage signal in the shape of the Gaussian derivatives is analyzed. The modelling presented in this paper is formulated in the time domain using an inverse Fourier transform of the analytical expressions obtained by Wu and King in the frequency domain. Such a modelling appears as an extens...

The space mapping is powerful technique for modeling a handset antenna. Thin-wire models are oppressed as coarse models in SM algorithm and fine models which is high accuracy electromagnetic simulations. We apply space mapping to design of antenna firstly We manipulate a coarse-mesh method of moments (MoM) solver as coarse model and align it with the fine-mesh MoM solution through space mapping...