Prof. Mauro Biagi
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Academic Career Length
25Years (2002-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications19 February 2015 in Journal of Lightwave Technology
Journal Article
The need allowing indoor access to the Internet services requires to reduce the electromagnetic pollution. Recently, the scientific community is looking for alternatives to the use of radio frequency communication, leading to propose and study the new paradigm of visible light communications. In order to present a system implementing transmission and access procedures, we propose a logical stream starting from user localization, so as to decide which LEDs can provide access, thus basically performing a space-division multiple access by scheduling data on the basis of the bits to be transmitted. For this aim, a two-bands access scheme is proposed, and implemented through the use of a separated channel where signaling specifies where, in the wavelength domain, the reception must be operated by the different users. A multiple-input multiple-output scheme is considered for data transmission, in order to increase rate with a reliable error rate performance. Performance is evaluated for what concerns localization and access tasks, so as to show the effectiveness of the proposed scheme. Performance comparison with the recent literature has been also reported.
1 December 2013 in Journal of Lightwave Technology
Journal Article
Visible light communications seeks to leverage an unused medium for indoor wireless communications. A major goal is to deliver very high data-rates through LED luminaires to all places where we use lighting. However, the characteristics of LEDs and the nature of indoor lighting conspire to distort the signals. Illumination powers LEDs have low signaling bandwidth and exhibit severe frequency distortion. Their wide dispersion patterns, required for light and signal coverage, also add multipath distortion. Intermittent shadowing results in a wide range of channel characteristics. In this paper we address these challenges with an adaptive receiver. Namely, training is used to identify channel impairments, and our proposed receiver applies specific countermeasures including threshold detection, RAKE reception and adaptive channel equalization. Analysis and simulation demonstrate that our design mitigates distortion problems yielding a performance improvement of 40% to 100% with respect to the current literature in achievable bit-rate depending on the propagation scenario.
1 November 2012
Conference Paper
Anna Maria VegniMauro BiagiNowadays, the use of Visible Light Communications is growing towards several applications, due to the many benefits of this technology. By efficiently modulating visible light, it is possible to reach very high data rates, while at the same time providing illumination. As a result, traditional indoor systems, like open offices and homes, become smarter, providing high efficient services i.e., localization, positioning and navigation. In this paper, we propose a simple method for indoor localization service provided by infrared LED devices. The positioning estimation can be calculated by exploiting the uniform deployment of LED-based transmitters, and the information of the impulse responses. The comparison to the impulse responses time samples of a room map, opportunely built according to the transmitters' deployment, allows to estimate the position of a mobile device inside the room. The estimation error can be then reduced on the basis of the number of LED devices used.
31 December 2014 in Journal of Lightwave Technology
Journal Article
Mauro BiagiAnna Maria VegniSPStefano Pergoloni
Stefano Pergoloni
PBPankil Mukund Butala
Pankil Mukund Butala
TLThomas Little
Thomas LittleVisible light communications (VLC) represents a new frontier of communications allowing high data-rate Internet access, specially in indoor environments, where the use of light emitting diodes (LEDs) is growing as a viable alternative to traditional illumination. As a result, LED output intensity can be varied faster than human eye can perceive, thus guaranteeing simultaneous wireless communications and illumination. One of the key challenges is the limited modulation bandwidth of sources that is typically around several MHz. The use of multiple input and multiple output (MIMO) techniques in optical wireless system helps to increase the capacity of the system and thus improve the system performance. In this paper, we investigate the use of an optical MIMO technique jointly with pulse position modulation (PPM) in order to improve the data rates without reducing the reliability of the link. PPM is known to be signal-to-noise ratio efficient modulation format, while it is bandwidth inefficient so the use of MIMO can compensate that drawback with reasonable complexity. Furthermore, an offline tool for VLC system planning, including error probability and transmission rate, has been proposed in order to solve the tradeoff between transmission rate and error rate. Finally, several numerical results and performance comparisons are reported.
25 December 2014 in Journal of Lightwave Technology
Journal Article
SPStefano Pergoloni
Stefano Pergoloni
Mauro BiagiSRStefano Rinauro
Stefano Rinauro
SCStefania Colonnese
Stefania Colonnese
RCRoberto Cusani
Roberto Cusani
GSGaetano Scarano
Gaetano ScaranoThe rising need of indoor broadband services without increasing the electromagnetic pollution has led the scientific community to look for smart spectrum usage. From this, it stems the need of emerging paradigm of visible light communications. In the context of the IEEE 802.15.7 Task Group activities, a new modulation format named color shift keying (CSK), based on sending signals spaced in the domain of the wavelength and able to both support the communication and the illumination of indoor environments, has been proposed. In this paper, we propose a transmission/reception scheme based on CSK modulation that also makes use of a modulation format that descends from the pulse position modulation by taking care of illumination level to be granted. The aim of this contribution is twofold: to propose the receiver architecture for that kind of transmission and to evaluate its performance by performing also comparisons with other contributions in the literature. The proposed scheme is robust with respect to optical interference and presents high rate and low bit error rate at the cost of a limited increasing of complexity of the receiver with respect to other approaches.
1 October 2010
Conference Paper
Mauro BiagiLLLutz Lampe
Lutz Lampe
Smart Grid collectively refers to various visions of how energy generation, distribution, and consumption should be managed to overcome many of the shortcomings of today's electricity grids and to sustain our ever more electricity dependent societies. One important enabling component of Smart Grid will be a fine-grained and reliable communications infrastructure that links together the many elements of the grid. Since by definition all these elements are connected to power lines, power line communications (PLC) technology is a natural candidate to build parts of such an infrastructure. In this paper, we consider the use of PLC in low- and medium-voltage distribution grids to connect network nodes (e.g., meters, actuators, sensors) through multihop transmission. In particular, we address the problem of routing of unicast messages making use of the stationarity of nodes. To this end, we motivate and investigate the application of geographic routing protocols and gauge their performance with respect to energy consumption and transmission delay.
About Me
Mauro Biagi is an Associate Professor at the Department of
Information, Electronics and Telecommunications (DIET) Engineering, Sapienza
University of Rome, Italy. He received the Laurea degree in communication
engineering and the Ph.D. degree in information and communication theory from
the Sapienza University of Rome, Rome, Italy, in 2001 and 2005, respectively.
Since 2006, he has served as an Assistant Professor at the Department of
Information, Electronics and Telecommunications Engineering, Sapienza University
of Rome, where, since 2015, he has been an Associate Professor. In 2010, he was
a Visiting Assistant Professor with the Department of Electrical and Computer
Engineering, University of British Columbia, Vancouver, BC, Canada. He is
responsible for international cooperation with colleagues in different
countries and his research activities are in the field of visible light
communications in the RGB-Comm Lab, where he advises Ph.D. students and postdocs
leading projects in the area of optical wireless. He is also responsible for
the research activities in the field of underwater communications in the
AMOUR-AQUALab for activities involving both acoustic and optical
communications. His research interests include MIMO systems, the Internet of
Things, underwater communications, smart grids, and optical wireless systems in
a very wide sense.