This paper presents a positioning algorithm, named time of arrival to time difference of arrival (TOAD), which computes timedifference-of-arrival (TDOA) measurements from the messages that time-of-arrival (TOA) stations in sight exchange while their positioning processes are running. This study addresses the accuracy of the TOAD algorithm in two different environments: lineof-sight (LOS) and no...

The Cellular Fixed Broadband Access System for LMCS (Local Multipoint Communication Services) is aiming to provide broadband services to fixed subscribers through wireless access. A representative LMCS scenario involves a cellular system design with the entire allocated bandwidth being used in each cell and with a highly directional antenna employed at the subscriber. The LMCS system designs re...

* U S WEST Advanced Technologies, Boulder, CO 80303. Tel. & e-mail respectively: 303-541-6052, [email protected] and 303-541-6257, [email protected]. Abstract– This paper presents a propagation study at 5.725 GHz – 5.825 GHz, within the U.S. Unlicensed National Information Infrastructure (U-NII) band. Propagation path loss is measured at 5.8 GHz in a residential area near Boulder, CO. Experim...

The problem of 3D-radiolocalization in indoor environments with Line Of Sight (LOS) and Non Line Of Sight (NLOS) conditions has been investigated in recent years. Many people in academia and industry are currently involved in the research and development of these kind of approaches. The aim of this communication is to find a simple method that decreases the errors due to the absence of LOS and ...

Location data are among the most widely used contextual data in context-aware and ubiquitous computing applications. Numerous systems with distinct deployment costs and levels of positioning accuracy have been developed over the past decade for indoor positioning purposes. The most useful method focuses on the received signal strength (RSS) and provides a set of signal transmission access point...

In single frequency network (SFN) positioning, base station (BS) identification is inevitable and non-line-of-sight (NLOS) propagation is usually dominant especially for indoor scenarios. BS identification and NLOSmitigation are two challenging problems which have significant impact on the SFN positioning performance. In this paper, a mobile tracking scheme is proposed to deal with these challe...

Vital sign (breathing and heartbeat) monitoring is essential for patient care sleep disease prevention. Most current solutions are based on wearable sensors or cameras; however, the former could affect quality, while latter often present privacy concerns. To address these shortcomings, we propose Wital, a contactless vital system low-cost widespread commercial off-the-shelf (COTS) Wi-Fi devices...

With the widespread use of automatic identification systems (AISs), some ships deceptive information or intentionally close their AISs to conceal illegal activities evade supervision maritime departments. Although radar measurements can be effectively utilized evaluate credibility received AIS data, propagation non-line-of-sight (NLOS) signal conditions is an important factor that affects locat...

Abstract Target tracking provides important location-based services in many applications. The main challenge of target is to combat the severe degradation problem Non-Line-of-Sight (NLOS) scenario. Most Deep Learning algorithms available literature address this issue belong batch learning with high complexity. This paper proposes a novel online sequential algorithm, Improved Recurrent Extreme M...

Millimeter wave (mmWave) technology is expected to dominate the future 5G networks mainly due to large spectrum available at these frequencies. However, coverage deteriorates significantly at mmWave frequencies due to higher path loss, especially for the non-line-of-sight (NLOS) scenarios. In this work, we explore the use of passive reflectors for improving mmWave signal coverage in NLOS indoor...