UWB Positioning Using Six-port Technology and a Learning Machine

Zhao, Yanyang; Wang, L.; Frigon, Jean-François; Nerguizian, Chahé; Wu, Ke; Bosisio, R.G.

doi:10.1109/melcon.2006.1653111

Cited by 4 publications

(2 citation statements)

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“…A number of modifications and extensions to conventional SVCs have been developed to reduce the complexity of the training process, such as online SVC training [12] and least squares SVC (LS-SVC) [13]. SVMs have been used for UWB systems in range estimation and positioning applications [14]. In digital communications, however, little work has been reported in the literature on applications of the SVM technique.…”

Section: Introductionmentioning

confidence: 99%

Support vector machine‐based equalisation for direct‐sequence ultra wideband systems

Musbah

Zhu

2011

Wireless Communications

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We proposed the support vector machine (SVM)-based equalisation schemes for direct-sequence ultra wideband (UWB) systems. The severe intersymbol interference caused by the UWB channel was formulated as a pattern classification problem in the SVM-based equaliser, which operates in two main modes: training and detection. We also applied the least squares support vector classifiers (LS-SVCs) to reduce the training complexity and sparse LS-SVCs to reduce the detection complexity, with little performance loss compared to SVCs. Simulation results confirm the outperformance of the proposed equalisers over the conventional rake receiver with the same order of complexity for detection, especially when no channel information is known at the receiver. Also, the SVM-based equalisers in the line-of-sight scenario provide a performance close to the case with additive white Gaussian noise only. He is currently a lecturer at Omar Al-Mukhtar University, Libya. His research interests include ultra wideband (UWB) communications, channel equalisation and machine learning, etc.Xu Zhu received the BEng degree (with first class honors) from the

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Section: Introductionmentioning

confidence: 99%

Support vector machine‐based equalisation for direct‐sequence ultra wideband systems

Musbah

Zhu

2011

Wireless Communications

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“…Furthermore, in the last decade, other kinds of positioning system were developed. In particular, there have been significant developments in positioning systems that works using the architecture of digital wireless communications, such as mobile personal communications, Third Generation Partnership Project (3GPP), Ultra Wide Band (UWB) [116], Wireless LAN and Bluetooth [9,20,43,104].…”

Section: Radio Positioning Systemsmentioning

confidence: 99%

Phase synchronization scheme for very long baseline coherent arrays

Merlano Duncan

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Precise phase synchronization of clock or local oscillator signals over distributed systems is a recurring requirement in the design of a wide range of systems, with applications in telecommunications and, for example, in phased arrays. Addressing this requirement is a challenging task when the distance between the subsystems is large in terms of the wavelength and, in particular, when this electrical distance is time-varying. Carrier phase synchronization is the most important challenge in order to implement distributed beamforming systems and to optimize their power efficiency. At the same time, phase synchronization is crucial for the implementation of distributed (bistatic / multistatic) radar systems. In the last decades different techniques for remote phase synchronization have been proposed. In 1968 Thompson discussed, compared and classified the available techniques for reducing propagation induced phase fluctuations in frequency distribution systems and presented the principle of round trip stabilization systems. These phase synchronization schemes are Phase Locked Loops (PLL) in which the phase offset is measured directly for the signal which travels along the two-way path, and a direct feedback action closes the loop. The most important challenge for the design of these systems is the implementation of a method for the discrimination between the waves that travel in opposite directions in the transmission channel. One approach that has been proposed in previous works to fulfill this requirement is the use of different frequencies. This Ph.D. thesis dissertation presents a new scheme for remote carrier phase synchronization in which a set of tones with similar frequencies are simultaneously used to synchronize two separated stations. In the proposed scheme, the bandwidth required by the set of tones traveling along the loop can be reduced wherewith the phase fluctuations generated by the dispersive effects of the medium can be drastically reduced. The proposed scheme was prototyped and tested in the laboratory, with satisfactory results, and a possible application of the phase synchronization prototype has been evaluated. In order to show the excellent behavior of the phase synchronization prototype a simple distance measurement experiment has been carried out. In that experiment the variations of a distance are obtained from the variations of a measured phase using the synchronization prototype.

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