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The Galileo E1 Open Service signal broadcasts a navigation message containing 120 bits of information per page on the signal component E1B. This raw navigation message is ½ convolutional encoded with a Forward Error Correcting (FEC) Code. The encoded symbols are interleaved within a block interleaver size of 240 symbols and broadcast every second. The resulting data rate is 250 symbol/second. The...
This paper presents a novel technique to improve data demodulation performance of global navigation satellite system (GNSS) signals with data and pilot signal components (e.g. suitable for Galileo E1B/C open service (OS) signals [1]). This technique is called Pilot-aided data demodulation because it uses the coherence between residual phase errors on the data and the pilot components of the GNSS signal...
Vertical positioning is nowadays a topic of high interest in indoor environments, due to the stringent requirements on indoor location accuracy for emergency calls, such as E911. Thus, indoor positioning techniques are investigated to achieve floor detection in order to fulfill these legal mandates. The use of Long Term Evolution (LTE) heterogeneous networks is an attractive solution due to the combination...
Long Term Evolution (LTE) signals are a very good complement to Global Navigation Satellite Systems (GNSS) in urban environments, due to their attractive positioning capabilities. However, the network-based positioning methods defined in the LTE standard hinder the use of these signals for ranging in an opportunistic way. This is mainly due to the lack of synchronization between LTE base stations...
Long Term Evolution (LTE) networks are rapidly deploying around the world, covering the needs of high data rates demanded by many applications. Still, less attention is paid on the positioning capabilities specified in the LTE standard. Thus, an experimental LTE positioning receiver is presented to assess the positioning accuracy in commercial LTE deployments. This receiver is based on a software...
This paper investigates a novel algorithm based on the Bump and Jump technique, capable of detecting and recovering from possible false lock events during the acquisition stage of BOC(1,1) Signals. Indeed the traditional Bump and Jump technique might lead to a false lock, in particular in harsh scenarios affected by strong multipath. Concerning this undesired event, an analysis of False Lock probability...
The maturity reached by virtualisation technology enabled great innovation for efficient applications and services development and delivery, independent of the underlying hardware equipment, especially with the large deployment of off-the-shelf hardware based cloud infrastructures. In order to take advantage of this technology, the existing network functions have to be developed and adapted to the...
The scope of this work is the analysis and assessment of power saving duty cycle techniques for GNSS receivers. One of the key design drivers of mass-market commercial GNSS devices is indeed power consumption. Different techniques are analyzed and a particular method, based on the alternation of active and sleep states, is implemented in a software receiver based on open-loop processing. The main...
Mass market receivers feature particular signal processing techniques, to comply with mobile and consumer devices resources and requirements. Delay and frequency estimation algorithms have then been redefined or adapted, in particular to cope with the new Galileo OS signals. The scope of the work is the analysis, development and performance examination of some of the main GNSS acquisition and tracking...
An enhancement of an existing algorithm to track the GNSS signals in presence of strong scintillation is presented. The Carrier Tracking mechanism employs both a Phase Locked Loop and Frequency Locked Loop and a switching mechanism between the two in order to maintain the signal lock during power fades and phase variations; a new Loss of Lock detection method based on the linearity region of the atan2...
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