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-INTRODUCTION
-
-Nowadays smartphones, internet of things (IoT) and many other wireless
-devices are carried around by everyone and have to work in environments
-that from a technical perspective are very far from ideal. Wireless
-channels have many complex problems that need to be solved to guarantee
-a reliable communication link.
-
-Among the multitude of problems, a common issue that observed in
-wireless channels is what is called "multipath fading effect". Multipath
-refers to the fact electromagnetic waves (EMWs) radiated from a sender
-antenna may take different paths by reflecting on multiple surfaces
-before reaching the receiver (see figure). Because EMWs travel at a
-constant speed, and some paths are longer than others, the receiver sees
-multiple overlapped (superimposed) copies of the sent signal, each with
-a different phase shift. In practice only one path is desirable, thus
-the other delayed copies cause a degradation of the received signal
-(fading).
-
-TASK DESCRIPTION
-
-The goal of the project is to develop a platform to illustrate the
-impact of different fading effects on the received signal. The platform
-is thus built for pedagogical purposes and ought to show the various
-parts of the signal processing chain of a receiver.
-
-METHODS
-
-Two USRP B210 software defined radio (SDR) devices from Ettus Reasearch,
-together with the open source software libraries GNU Radio and Dear
-PyGUI were used to create a graphical user interface to display
-waveforms from either a simulated or real wireless links affected by
-multipath fading. The platform transmits a picture either using QPSK or
-16ary QAM over a 2.4 GHz carrier and computes the empirical bit error
-rate of the link.
-
-