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  • New channel estimation techniques for cooperative underwater acoustic OFDM systems 

    Authors:Mustafa, Erdoğan
    Publisher and Date:
    Cooperative underwater acoustic communication systems come into prominence in recent years. Since underwater channels are sparse and additive noise entering the system is colored Gaussian noise it is very difficult to estimate the underwater channels and theoretically makes it interesting. in the first part of the thesis the transmission from source to the target recipient is realized by means of a relay system. Orthogonal frequency division multiplexing (OFDM)-based channel estimation problem is ...

  • Real Frequency Design of Pi and T Matching Networks with Complex Terminations 

    Authors:Şengül, Metin Y.; Yeşilyurt, Gökmen
    Publisher and Date:(IEEE, 2017)
    In this paper real frequency design of Pi and T matching networks with complex terminations is studied. Generally the generator and load termination impedances are given as measurement values. So they can be regarded as a resistor and a reactive element connected in series. To be able to design a Pi network this series impedance models must be transformed to parallel models. But for T network designs the assumed series models can be utilized there is no need a transformation process. Then Pi or T ...