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This paper presents a location determination technique which is based on wireless local area networks(WLANs), in particular the IEEE 802.11b standard, in conjunction with GPS(Global positioning system). Since each of the positioning device has it's shortcomings, this paper proposes to use the data obtained from the GPS system together with the WLANs(More)
The use of time-frequency distributions is proposed as a nonlinear signal processing technique that is combined with a pattern recognition approach to identify superimposed transmission modes in a reconfigurable wireless terminal based on software-defined radio techniques. In particular, a software-defined radio receiver is described aiming at the(More)
A carrier offset correction scheme based on Maximum Likelihood (ML) method for the downlink of an Orthogonal Variable bit rate Multicarrier-CDMA (MC-CDMA) scheme in a fast frequency selective Rayleigh fading channel is proposed and discussed. The proposed methodology assumes perfect knowledge of phase offset, whereas an Equal Gain Combining (EGC) scheme is(More)
This paper describes a Positioning algorithm that uses the signal strength, received by a Wireless Local Area Network, to determine users position. The system improves positioning accuracy by mitigating the multi-path and noise, through an empirical analysis of environment and a pre-post curser mitigator. Results, in terms of relative error, are presented(More)
In this work, a mode identification system for superimposed signals in the same band is presented. More precisely, a pattern recognition approach, based on Wigner Distribution for features extraction and non parametric classifiers (k-Nearest Neighbors and Parzen) is proposed for identifying the transmission modes in an indoor wireless environment. A(More)
Modulation/mode identification is an interesting topic in wireless communications. The general main problem is the recognition of the transmission mode employed in a radio environment. In this work the problem of modulation/mode recognition is exploited in the context of Smart Space (SS) applications for a distributed wireless sensor network where the(More)
University of Genoa, with a thesis concerning the simulation and performance evaluation of high-bit-rate transmission systems over HFC networks in remote cable-based video-surveillance applications.From march 1999 he cooperate with the ISIP group, where he worked on the application of spread spectrum techniques over wireless and wired environments. From(More)
The use of Time Frequency (TF) analysis is proposed as signal processing technique combined with a pattern recognition approach, for identifying the transmission modes in indoor wireless environment with a reconfigurable mobile terminal based on Software Radio techniques. In particular, a Software Radio device is considered aiming at the identification of(More)
A basic step in the asynchronous DS/CDMA reception consists in the effective acquisition of the initial pseudo-noise (PN) synchronism. This is especially true in the case of multiuser DS/CDMA systems, dominated by multiuser interference (MUI), as it often happens in multimedia satellite networks, generally characterised by asynchronous transmission. In this(More)