Browsing by Author "ERDEM, Cihangir"
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Item A WEB BASED TRAINING MODULE FOR TEACHING DIGITAL COMMUNICATIONS(2015-06-02) KARA, Ali; ERDEM, Cihangir; ÖZBEK, Mehmet Efe; ÇAĞILTAY, Nergiz; AYDIN, ElifAn interactive module which simulates a digital transmission link from one end to the other has been designed. Using the module, a user may enter a short audio/message signal using microphone of a PC, and then follows processes on the signal at each stage of the digital transmission link. The user can also analyze the signal at every stage of the link, and compare the performance of various modulation schemes used in the link, and finally may see how the audio signal is corrupted by noise in the transmission link. In this way, from source point to destination point of the signal, the user may study various stages such as analog to digital conversion, analysis of effects of Gaussian noise on the message signal.Item TOWARDS REAL TIME IMPLEMENTATION OF SPECIFIC EMITTER IDENTIFICATION ON PULSE WAVEFORMS: OPTIMIZATIONS ON A LOW COST COMMERCIAL PLATFORM(2012-10-29) ERDEM, Cihangir; KARA, AliSpecific Emitter Identification (SEI) methods are used in intercept systems for differentiating of same type of emitters in the environment. Most of the SEI implementations are designed for post processing (off line) by operators. This thesis presents results of study towards the real time (on line) implementation of a SEI method on signals after the IF stage, i.e. video signals (envelope) after the detector section. Initially, only the envelopes of the pulses are considered in SEI processing. Pulse width, rise time, fall time, rise slope angle, fall slope angle and pulse point are main parameters used in SEI algorithm developed. On the other hand, one of the main problems in operational environments is multipath distortion on received pulses. Moreover, creating and running of a library is another important issue. This thesis presents various approaches in both processing of multipath distorted pulses and wavelet based library creation methods on real-time SEI implementation for an intercept receiver.Item TOWARDS REAL TIME IMPLEMENTATION OF SPECIFIC EMITTER IDENTIFICATION ON PULSE WAVEFORMS: OPTIMIZATIONS ON A LOW COST COMMERCIAL PLATFORM(2012-01-25) ERDEM, Cihangir; KARA, AliSpecific Emitter Identification (SEI) methods are used in intercept systems for differentiating of same type of emitters in the environment. Most of the SEI implementations are designed for post processing (off line) by operators. This thesis presents results of study towards the real time (on line) implementation of a SEI method on signals after the IF stage, i.e. video signals (envelope) after the detector section. Initially, only the envelopes of the pulses are considered in SEI processing. Pulse width, rise time, fall time, rise slope angle, fall slope angle and pulse point are main parameters used in SEI algorithm developed. On the other hand, one of the main problems in operational environments is multipath distortion on received pulses. Moreover, creating and running of a library is another important issue. This thesis presents various approaches in both processing of multipath distorted pulses and wavelet based library creation methods on real-time SEI implementation for an intercept receiver.