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Wireless transmission interference modeling (AWGN, Rayleigh, Rice fading channels)
Hloušek, Tomáš ; Gleissner, Filip (referee) ; Mikulka, Jan (advisor)
This thesis describes and models wirelesss transmission intereferences in real communication channels. A signal received on a fading channel is subjected to a multiplicative distortion and to the usual additive noise. Real channel adds to the signal noise and fadings. Gaussian noise is a result of channel awgn. Fadings is implicated by multipath propagation of signal in Rayleigh and Rician channels. Main goal of this project is to program BERsolve, which is created in tool GUIDE in Matlab. User program BERsolve makes it possible to analyse bit error rate and symbol error rate for some types of channel models, which are defined by standard COST207. BERsolve offers some other functions i.e. display time behaviour, constellation diagram and spectrum. This program provides us with an overview representation of problem by multipath interferences in communication channels.
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High-speed optical transmission systems
Pekárková, Kateřina ; Číž, Radim (referee) ; Münster, Petr (advisor)
The diploma thesis is focused on high-speed optical connections using optical fibers for transmission and transmission systems with speeds above 100\,Gb/s. In the first part of the work, the theory of the area of optical high-speed connections is discussed, especially the work is focused on the coherent type of data transmissions. Modulation and multiplexing formats, chromatic dispersion, modal and polarization modal dispersion, optical fiber attenuation and nonlinear phenomena are also described. The theoretical part of the work also deals with the description of the differences between coherent and non-coherent transmission methods and the description of coherent high-speed optical transmission and its components. The practical part contains two laboratory tasks that, using simulations in the VPIphotonics environment, compare two-state and multi-state modulation for systems with a transfer rate of 10\,Gbit/s and 100\,Gbit/s. The properties of these modulation formats are demonstrated using decision eye diagrams, constellation diagram and bit error rate values for different lengths of optical fiber, which are the output of the simulation environment.
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Wireless transmission interference modeling (AWGN, Rayleigh, Rice fading channels)
Hloušek, Tomáš ; Gleissner, Filip (referee) ; Mikulka, Jan (advisor)
This thesis describes and models wirelesss transmission intereferences in real communication channels. A signal received on a fading channel is subjected to a multiplicative distortion and to the usual additive noise. Real channel adds to the signal noise and fadings. Gaussian noise is a result of channel awgn. Fadings is implicated by multipath propagation of signal in Rayleigh and Rician channels. Main goal of this project is to program BERsolve, which is created in tool GUIDE in Matlab. User program BERsolve makes it possible to analyse bit error rate and symbol error rate for some types of channel models, which are defined by standard COST207. BERsolve offers some other functions i.e. display time behaviour, constellation diagram and spectrum. This program provides us with an overview representation of problem by multipath interferences in communication channels.
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