Research Areas

Visible Light Communication Systems

VLC adopts the visible light between 400 and 800 THz to transmit data wirelessly. It has the potential to become a complementary technology to Radio Frequency communication. Though there has been a great deal of interest in VLC networks in recent years, the lack of an open-source reference platform for VLC networks is hindering the progress of the research community. At IMDEA Networks Institute, we take an initial step toward this and have designed OpenVLC, an open-source software-defined VLC networking platform for fast prototyping, which runs on a cost-effective yet powerful credit-card-sized embedded board. We interface LEDs, photodiode and ancillary electronics to an embedded Linux networking platform. Read more ....

 

 

Distributed Spectrum Monitoring Systems

Today's spectrum measurements are mainly performed by governmental agencies which drive around using expensive specialized hardware. Each country creates and maintains its own national frequency allocation plan which describes how the EM spectrum shall be used. Despite, the EM spectrum is well-organized in terms of frequency allocation, it's actual usage in different geographical places and times is not well-known at all. The idea of distributed spectrum monitoring has recently gained attention to capture the real-time usage of the wireless spectrum at large geographical scale. Read more ....

 

mmWave Communication Systems

The spectrum fragmentation below 6 GHz makes current wireless communication systems not suitable to support user data rates of Gb/s and above in a commercially viable manner. Such bandwidth shortage has motivated the exploration of vacant, unlicensed spectrum at higher frequencies, and in particular in the millimeter-wave (mmWave) frequency bands which the future fifth-generation (5G) wireless standard is expected to exploit. Due to the higher propagation loss and unfavorable atmospheric absorption, data transmission over relatively long distances represents a serious challenge at mmWaves. The rather short wavelength, however, allows more antenna elements to be integrated into devices and base stations operating in this band, thus enabling the implementation of large-scale multiple-input multiple-output (MIMO) and adaptive antenna arrays to overcome range limitations. Read more ....
 
 
 
 
 
 
Mobile Indoor Localization Systems

Despite the increasing interest in the area of mobile indoor localization, the positioning capability of Wireless Local Area Network (WLAN)-based mobile devices does not meet the goal of high accuracy and fast time response for scenarios with mobile devices (such as smartphones and wearables) as target device. We have designed and built an approach that uses Time-of-Flight (ToF) measurements and relies on software upgrades of simple commercial off-the-shelf (COTS) 802.11 chipsets with a customized firmware that can be integrated in any access point (AP).  Read more ....