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OceanNet project uses a hierarchical point-to-multi-point backhaul network using long range Wi-Fi technology to provide extended offshore connectivity for fishing vessels. This work is aimed to understand the interrelationship between the design parameters and the reason for considering specific parameter values for the OceanNet solution. The research work explores the communication systems theoretical...
Photonic weight banks employing multivariate statistical techniques could extend performance limits of multiantenna radio systems. We characterize the aggregate bandwidth penalty imposed by a silicon microring weight bank and assess application regimes for multivariate RF photonics.
We investigate multi-port ladder impedance matching (MLM) for enhancing the capacity of compact MIMO communication systems. MLM builds upon single-port matching (SPM) techniques by incorporating an additional reactance that connects adjacent antenna ports together and promises enhanced performance while maintaining good bandwidth. We demonstrate numerically for a 5-element compact MIMO system that...
Abstract-In this paper, we consider a mixed RF and hybrid RF/FSO system where several mobile users transmit their data over an RF link to a relay node (e.g. a small cell base station) and the relay forwards the information to a destination (e.g. a macro cell base station) over a hybrid RF/FSO backhaul link. The relay and the destination employ multiple antennas for transmission and reception over...
Recently, several MIMO transmission method is investigated for increasing the capacity or spectral efficiency. To well utilize the MIMO transmission approach, channel state information is required in transmission side. So, channel sounding in receiver side also becomes important for feedback the low-error channel state information to the transmitter. Thus, we investigate the detail procedure and performance...
Application of filter bank multicarrier (FBMC) as an effective method for signaling over massive MIMO channels has been recently proposed. This paper further expands the application of FBMC to massive MIMO by applying frequency spreading equalization (FSE) to these channels. FSE allows us to achieve a more accurate equalization. Hence, higher number of bits per symbol can be transmitted and the bandwidth...
Wireless sensor networks are currently widely used in various monitoring and control applications. Most of the deployed wireless sensor networks are now based on 2.4GHz radio, which have the advantage of having higher data rate due to availability of wider channels. This advantage, however, comes at the cost of short range communication and having a crowded band. 433MHz radio communication is an alternative...
The Sardinia Radio Telescope is approaching to its official inauguration. Nowadays, the technical staff is accomplishing the last remaining activities to set up and integrate the microwave receivers, the digital processing systems and all the equipment necessary to reach a top level in the international scenario of large radio telescopes. Even if the radio telescope is still along the technical commissioning,...
Standards are being developed for airport surface wireless networks. Such networks have been denoted as Airport Network and Location Equipment (ANLE) or Aeronautical Mobile Airport Communications System (AeroMACS). The term ANLE/AeroMACS will be used in this paper.
Network-on-Chips (NoCs) paradigm is fast becoming a defacto standard for designing communication infrastructure for multicores with the dual goals of reducing power consumption while improving performance. However, research has shown that power consumption and wiring complexity will be two of the major constraints that will hinder the growth of future NoCs architecture. This has resulted in the investigation...
Construction and commissioning of the Atacama Large Millimeter/Submillimeter Array (ALMA) is progressing rapidly. Even with a fraction of the total number of antennas to be located at the Array Operations Site (AOS) in northern Chile in place, ALMA is the most powerful millimeter/submillimeter interferometer in the world. In this paper I report on the progress of array commissioning and science verification...
In this paper, a path loss (PL) model for 802.11n in large conference rooms is determined, based on PL measurements. The PL can be described accurately by a one-slope model with one standard deviation. PL exponents varying from 1.2 to 1.7 are found. Based on this PL model, the effect of frequency (2.4 vs 5 GHz), configuration (SISO vs MIMO (spatial diversity)), bandwidth (20 vs 40 MHz) and transmit...
The microcellular system and distributed antenna system (DAS) are two promising systems to provide high data rate for future wireless communications, especially for the cell edge of the macrocell, because both systems can reduce the radio transmission distance. The cell edge spectrum efficiency is theoretically compared between the two systems in a network topology with seven macrocells, each of which...
WiMAX-WiFi multi-tier network has emerged as a promising solution for fast delivery of broadband wireless access services. This is particularly true in places where wired infrastructure is not ready or too expensive. The architecture also has the advantage of taking the complementary features of these diverse technologies (from technical and economic viewpoints) to provide capacity and coverage extension...
This paper proposes how antenna polarization can be utilized to increase the maximum data rate in a multiple six-port receiver system. By utilizing data and carrier interleaving, the total information bandwidth increases and therefore the maximum data rate. Prototype antennas were manufactured and the measured results were later used in a simulation model with three channels for verification of the...
This paper presents the requirements on the preselect-filter for UWB applications for different Front-End linearities and interference scenarios. A procedure to calculate the minimum out of band attenuation was developed in order to achieve a high system performance in presence of interferer. A filter diagram is proposed for a robust UWB communication. Results show which UWB-bands are affected by...
Chipless RFID SAW technology has been identified as a possible solution for NASA's long term needs for ground, space-flight, and space-exploration sensor requirements. SAW has many unique advantages over possible competing technologies, which include the following properties: passive, radiation hard, operable over wide temperature ranges, small, rugged, inexpensive, and identifiable. The purpose of...
The Synthetic Aperture Radar (SAR) data obtained from a single emitter and a single receiver gives information in the Fourier domain of the scene over a line segment whose width is related to the bandwidth of the emitted signal. The mathematical problem of image reconstruction in SAR then becomes a Fourier Synthesis (FS) inverse problem. When there are more than one emitter and/or receiver looking...
Development of reconfigurable RF resembles the Quest for the Holy Grail. It was started a long time ago; interesting developments have been achieved but it looks like it will never finish. However, as more and more microelectronic markets are under intense pressure, the need for reconfigurable RF systems is constantly growing. This paper aims at describing all current evolutions which push towards...
In this paper, we implement implantable cardioverter defibrillator (ICD) system. In order to implement the ICD, we propose the baseband according to modulation method, modulation index and bandwidth time product. From simulation results, we decide GFSK modulation with modulation index 0.2 and bandwidth time product 0.5. Also the receiver sensitivity of ICD link budget decides -83.22 dBm using receiver...
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