There are many challenges in building an ultra-wideband (UWB) indoor local positioning system for high-accuracy applications. These include reduced accuracy due to multipath interference, sampling rate limitations, tag synchronization, and antenna phase-center variation. Each of these factors must be addressed achieve millimeter or sub-millimeter accuracy. The developed architecture is presented where a 300-ps Gaussian pulse modulates 8-GHz carrier signal transmitted through omni-directional...

In this paper, we propose a novel architecture for ultra-wideband (UWB) positioning systems, which combines the architectures of carrier-based UWB systems and traditional energy detection-based systems. By implementing architecture, have successfully developed standalone noncoherent system both static dynamic targets in an indoor environment with approximately 2 5 mm 3-D accuracy, respectively. The results are considered great milestone developing such technology. 1-D experiments been...

In this article we review an important class of wireless cooperation protocols known as amplify-and-forward relaying. One or more low-complexity relay nodes assist the communication between sources and destinations without having to decode signal. This makes AF relaying transparent modulation coding source/destination protocol. It is therefore a highly flexible technology that also qualifies for application in heterogeneous networks comprising many different complexity even standards....

An accurate ultra wideband (UWB) localization approach has been developed based on time difference of arrival (TDOA). This method provides sub-cm accuracy, which is excellent for indoor utilization when compared with frequency modulated continuous wave (FMCW) systems. The system also in compliance FCC UWB regulations and achieves ranging measurements. utilized domain measurements suppress multipath signals have potential sub-mm resolution

We consider a wireless network with one source/destination pair and several linear amplify-and-forward relays. The influence of the gain allocation at relays on performance in cooperative relay communication links is analyzed. present an optimal which results coherent combining all signal contributions destination maximizes instantaneous throughput link. If channel state information (CSI) limited, diversity schemes can be used. show that right choice amplification gains crucial to achieve...

In this paper, we investigate the use of power line communication (PLC) to assist cooperative wireless relaying. We consider a scheme that uses initialize and synchronize amplify-and-forward relays broadcast information between relays. Starting from an analysis transfer functions noise measurements PLC channels in office residential environments, propose transmission for inter-relay-communication assess influence on This is based linear precoded orthogonal frequency-division multiplexing; it...

A high resolution ultra wideband (UWB) positioning radar system based on time difference of arrival (TDOA) has been developed. The UWB provides millimeter accuracy in dense multipath indoor environments for 1D, 2D, and 3D localization. is fully compliant with the FCC regulations utilizes domain measurements to suppress both signals non-line sight (NLOS) errors a potential even sub-mm

In this paper, the authors proposed a technique to improve gain, narrow H-plane beamwidth, and minimize phase center variations with frequency by utilizing Vivaldi antenna protruded dielectric rod. A sample was fabricated measured, preliminary measured results are very promising, in good agreement simulation results.

Since the ruling of Federal Communications Commission (FCC) in United States to open up spectrum from 3.1-10.6 GHz for ultra wideband (UWB) applications 2002, interest use UWB localization outside military has skyrocketed. The multi-purpose nature and also high or low data rate communication make it robust attractive many indoor including wireless sensor networks, medical body area networks (BANs), surgical navigation, etc. A push towards integrating with Global Positioning Systems (GPS),...

Ultra wideband (UWB) localization systems have gained widespread use in indoor environments. Certain applications such as surgical navigation require high 3-D accuracy on the order of 1-2 mm. An adaptive leading-edge detection algorithm is proposed to obtain 1-D ranging even dense multipath conditions. This provides a robust sensing platform at UWB base station for signals with low signal-to-noise ratios (SNRs) and non-line-of-sight (NLOS) The which includes matched filter (MF) first detect...

No AccessJournal of UrologyCLINICAL UROLOGY: Case Reports1 Jul 2002Polyorchidism: A Strange Anomaly With Unsuspected Properties Robert Spranger, Marcel Gunst, and Michael Kühn SprangerRobert Spranger , GunstMarcel Gunst KühnMichael View All Author Informationhttps://doi.org/10.1016/S0022-5347(05)64868-9AboutFull TextPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissionsReprints ShareFacebookLinked InTwitterEmail "Polyorchidism: Properties." The Journal Urology, 168(1), p. 198...

We consider a wireless network with one source/destination pair and several linear amplify-and-forward relays. All nodes are equipped single antenna. To achieve cooperative diversity we propose time-variant relay specific phase rotations induced at each to make the effective channel time-variant. This transformation of spatial into temporal can be exploited by an appropriate outer code. Furthermore show that allocation amplification gains relays has great influence on performance give low...

UWB communication and localization systems have many inherent advantages for robust performance in dense, indoor multipath environments. Although been designed numerous industrial applications, there exists the need short range (i.e. 5-10 m) with accuracy an order of magnitude higher mm-range) than existing commercial systems. Many system level challenges must be overcome to achieve on tens picoseconds, such as high Rx sampling rate, Tx-Rx LO phase noise, pulse repetition frequency clock...

Wireless technologies are becoming more prevalent in hospital environments. An ultra-wideband (UWB) indoor tracking system is outlined, which has dynamic 3-D real-time root-mean-square error the range of 5.24-6.37 mm using line-of-sight signals different experiments. This high accuracy opens up many new applications to UWB wireless positioning, includes its use for smart surgical tools and ability register relevant objects scene such as a spacer block pressure mapping femoral condyles....

We consider a wireless network consisting of several active source/destination pairs and idle nodes. All nodes are equipped with one antenna. The communication between takes place over two-hop links. Idle used as amplify-and-forward relays assisting the communication. investigate benefits potential joint cooperative diversity channel adaptive scheduling in such network. show that this scheme is able to exploit multiuser well diversity. It even makes fair possible. Performance analysis done...

Ultra wideband (UWB) wireless systems have many advantages in indoor environments with dense multipath. UWB positioning are increasingly used to track and locate important assets. Many applications exist medicine for which includes tracking personnel, assets, even surgical navigation. We designed a system millimeter range accuracy potential use This paper outlines multi-tag access scheme our integrates 2.4 GHz physical layer allow simultaneous of up 30 tags. A static experiment was performed...

Continuous monitoring of vital information via a wireless medium has become an integral part next-generation health-care technologies. The benefits technique include facilitating in-home care services, reduction the cost frequent visits to hospitals, and lightening burden elderly persons. development miniature, lightweight, energy-efficient circuit solutions for biomedical sensor applications been made possible by tremendous recent advancements in technologies, micro- nanofabrication...

Future wireless communication systems have to support high data rates. The capacity of these can be increased dramatically by using multiple antennas at the transmitter and receiver working in a rich scattering environment. However, line-of-sight environment, MIMO channel matrix is rank deficient, therefore increase diminishes. Using cooperative amplify forward relay nodes, it possible overcome this problem increasing channel. A special signaling scheme necessary achieve rank. Therefore use...

Converged wired and wireless networks promise to meet both real-time mobility requirements of factory automation scenarios. Time-Sensitive Networking (TSN) 5G are auspicious technologies for future industrial communication. Hence, the combination communication is extensively discussed use cases. In this paper, we analyze time synchronization in realistic converged through IEEE 802.1AS. We provide a formulation mechanisms system model Moreover, investigate accuracy TSN 5G/TSN given from IEEE,...

Vehicle-to-X communication enables vehicles and other road users to exchange information in order increase traffic efficiency safety. All participants build a decentralized ad hoc network that can operate without the need for additional infrastructure. Two competing transmission technologies are available this purpose. The WLAN-based approach ITS-G5 cellular-mobile-based LTE-V2X both enable direct of between participants. Each these has individual advantages disadvantages recommend specific...

We consider a wireless network, which consists of several active source/destination pairs and number idle nodes. Multiple nodes volunteer as relays to facilitate the communication. All have low mobility fading channel is essentially constant over latency time scale interest (block fading). Conventional adaptive scheduling techniques are either unfair or inefficient in this context. introduce new approach jointly utilize cooperative diversity regime. In contrast known approaches scheme does...

We have developed a novel UWB positioning system with millimeter range 3D accuracy. It is difficult to comprehensively simulate of this nature since many disparate components must be simulated including the analog front end, digital backend, channel, tag and base station positions, etc. Only through simulation framework where Agilent advanced design (ADS) used, combining its analog/RF Ptolemy simulators also Matlab cosimulation it possible accurately system. Experimental results from our are...

Ultra wideband (UWB) positioning systems are increasingly used in indoor environments since commercial can provide 3-D accuracy of a few centimeters. Many applications exist medicine for UWB which includes tracking personnel, assets, and surgical navigation. We have designed system with millimeter accuracy. Certain applications, including navigation, even more stringent requirements the sub-millimeter range. challenges must be overcome to achieve multipath interference, clock jitter drift,...