Modeling of time domain represented signals with multitone signals

Date

2014

Author

Cansız, Gökhan

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Signals in certain systems, such as the transmitted signal in a cellular communication system, are strongly time dependent, non-deterministic and stochastically not well defined. Predicting the performance of the transmitter with such a signal at its input is important for efficient operation. Therefore, it is crucial to model a given time dependent waveform by multi-tone signals, which enables analytical derivations. In this thesis, multi-tone representation is employed to model the varying envelope arbitrary waveforms. Number, amplitude, phase of the tones and spacing between tones are considered as parameters for the multi-tone stimuli. To prove the validity of the multi-tone representation, CCDF curve is considered as a figure of merit for comparison. Different nonlinear amplifiers are excited with an arbitrary waveform and its multi-tone representation in the simulation environment. At the output of the amplifier, similar nonlinear behaviors such as, in-band and out of band distortion powers are observed. After proving that original and model signal have similar nonlinear responses, modulation performance of the arbitrary waveform and model signal in a transmitter chain is investigated for different drive levels.

Subject Keywords

Signals and signaling., Mobile communication systems., Cell phone systems., Power amplifiers.

URI

http://etd.lib.metu.edu.tr/upload/12617114/index.pdf
https://hdl.handle.net/11511/23526

Collections

Graduate School of Natural and Applied Sciences, Thesis