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This paper details the purpose, organization, content, and experience with a new hands-on project-based course on radio receiver front-end system engineering. In many electrical engineering programs, courses on wireless communications tend to focus on the digital signal processing performed on a basebanded signal. Courses on RF circuits tend to focus on the design of individual components (filters,...
In this paper, we propose, evaluate and analyse for the first time a mobile optical wireless (OW) system that operates at 10 Gbit/s. We propose a mobile OW system that employs beam angle and beam power adaptation in a line strip multibeam spot diffusing system configuration in conjunction with an angle diversity receiver (APA-LSMS), to reduce the impact of ambient light noise, multipath dispersion...
In this paper, we propose an alternative carrier phase independent timing recovery method for VSB receivers. The Gardner algorithm may not estimate the timing offset in VSB systems when the residual carrier phase offset is contained in the signal. We use the conjugate multiplication of received signals to cancel the carrier phase offset. Then, the Gardner algorithm is employed to extract the spectral...
We propose a power scalable digital base band for a low-IF receiver for IEEE 802.15.4-2006. The digital section's sampling frequency and bit width are used as knobs to reduce the power under favorable signal and interference scenarios, thus recovering the design margins introduced to handle worst case conditions. We propose tuning of these knobs based on measurements of Signal and the interference...
This paper deals with a robust RFSID (RF Self IDentification) system for autonomous logistic applications. The RFSID based system operates in Ku-band and consists of a fixed transmitter, located along the path, and of a receiver unit placed on the moving target. A slotted waveguide antenna array is used to illuminate the moving object at the desired position, while a four patch array antenna is adopted...
Mobile-to-mobile communication, direct, not via base stations, is an upcoming challenge. Different as in mobile-to-mobile communications for Car-to-Car (C2C) or Vehicle-to-Vehicle (V2V) communication no base stations exist. The transmitter as well as the receiver is moving and the propagation paths change continuously. No high gain directive antennas, radiating several watts (of power) are part of...
RF receiver is the key component of receiver. In this paper, the behavioral simulation model of RF receiver is made through the simulation of many parameters, such as gain, noise factor, dynamic range and so on. On the basis of above, the model is validated by experiment. It's helpful to evaluate the receiver EMC quantificationally.
The Global Positioning System (GPS) has been the most popular choice for positioning in open-sky environments, but its difficulty in dealing with signal blockage from buildings, trees and the like has limited its operation in urban environments, underground and especially indoors. Recent advancements in location technology have led to the development of Assisted GPS (A-GPS) technology that can operate...
Considering its central importance to sensor networks, time synchronization has received extensive attention by the research community. Nevertheless, we argue in this paper that existing approaches introduce undesirable trade-offs. For example, while GPS offers excellent accuracy for outdoor deployments, the high cost and power consumption of GPS receivers make them prohibitive to many applications...
Based on experimental data obtained during an extensive measurement campaign aimed at building penetration loss for satellite services, this paper presents the influence of the receiver position inside three case-study buildings. After a brief description of the measurement system, the corresponding measurement scenarios are described in detail. Finally, results at the frequency of 5.0 GHz are discussed...
This paper investigates the effect of using adaptive power reconfigurability method for preventing power over-usage when the operating conditions are less demanding than the worst case in wireless receivers. The analysis is limited to the baseband block, and the target standard is selected as ZigBee. Optimal distribution of the dynamic range requirement among the baseband filter and the ADC showed...
We consider a wireless communication model where a large number of transmitter-receiver pairs share a common Rayleigh fading channel without any coordination between them. The performance of a simple coexistence etiquette is analyzed in details, where packets are allowed to be transmitted from a given terminal only if the signal-to-interference-plus-noise ratio (SINR) at their intended receiver exceeds...
We propose a new algorithm for estimating the location of an outdoor RFID node, based on the received signal strength (RSS) of a transmitted message by a set of readers with known locations. The algorithm supposes omni-directional RFID readers that are prevalent for outdoor long range RFID systems. The method does not require knowledge of the Effective Isotropic Power (EIPR) of the transmitting tag,...
In order to facilitate the deployment of wireless systems in medical environments, indoor channel measurements at 2.4 GHz have been performed in a hospital. In these environments, monitoring applications are of particular interest, where a patient carrying a medical body area network (MBAN) transmits data to a fixed receiver. The receiving node may be placed in practice at different locations, for...
Increasing the symbol rate up to 25% faster than the Nyquist criteria for a digital communications system with QPSK modulation with an AWGN channel does not significantly increase the bit error rate or required transmission bandwidth. This so-called Faster-than-Nyquist (FTN) signalling has not been used in commercially deployed communications systems since the previously proposed implementation schemes...
The increase in navigation accuracy demanded by EGNOS and Galileo and their future evolution encourages the study and design of advance receiver architectures. In that direction, the ADIBEAM project focuses on the design of high accuracy ground stations, specifically GNSS Reference Stations, in order to improve its robustness in front of multipath and interference errors with the goal of achieving...
A multipath model for the aeronautical channel, which was derived from a channel measurement campaign, has been implemented into hardware simulators. The way of implementation is described in detail and simulation results obtained with a GNSS receiver and showing the impact of multipath are presented.
There is an increasing concern that the open GNSS services are highly vulnerable to malicious and accidental denial of service events by low power jammers and location “spoofers” (meaconing). AJAMS (Anti Jamming and Meaconing System) is a new system concept, developed by Thales, built on the back of the services provided by Galileo, which requires no change to the existing Galileo signals or system...
GNSS-based Road User Charging (RUC) systems are particularly interesting because of their flexibility and reduced roadside infrastructure. At present, truck toll collection systems based on GPS receivers installed on the vehicles are already deployed in German and Slovak motorways. Reliability of road tolling systems is fundamental in order to limit the loss of revenue because of undercharging and...
The use of GNSS receivers for on-board satellite orbit determination has become a common solution in new satellite design, as it considerably simplifies the overall architecture if compared to traditional orbit determination systems. Different challenges have to be faced while designing a GNSS system for these applications, since in general the terrestrial receivers are not designed to guarantee their...
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