Development of a dc-ac power conditioner for wind generator by using neural network

This project present of development single phase DC-AC converter for wind generator application. The mathematical model of the wind generator and Artificial Neural Network control for DC-AC converter is derived. The controller is designed to stabilize the output voltage of DC-AC converter. To verify the effectiveness of the proposal controller, both simulation and experimental are developed. The simulation and experimental result show that the amplitude of output voltage of the DC-AC converter can be controlled

Digital signal processing waveform aggregation and its experimental demonstration for next generation mobile fronthaul

L'abstract è presente nell'allegato / the abstract is in the attachmen

Optical heterodyne analog radio-over-fiber link for millimeter-wave wireless systems

Optical heterodyne analog radio-over-fiber (A-RoF) links provide an efficient solution for future millimeter wave (mm-wave) wireless systems. The phase noise of the photo-generated mm-wave carrier limits the performance of such links, especially, for the transmission of low subcarrier baud rate multi-carrier signals. In this work, we present three different techniques for the compensation of the laser frequency offset (FO) and phase noise (PN) in an optical heterodyne A-RoF system. The first approach advocates the use of an analog mm-wave receiver; the second approach uses standard digital signal processing (DSP) algorithms, while in the third approach, the use of a photonic integrated mode locked laser (MLL) with reduced DSP is advocated. The compensation of the FO and PN with these three approaches is demonstrated by successfully transmitting a 1.95 MHz subcarrier spaced orthogonal frequency division multiplexing (OFDM) signal over a 25 km 61 GHz mm-wave optical heterodyne A-RoF link. The advantages and limitations of these approaches are discussed in detail and with regard to recent 5G recommendations, highlighting their potential for deployment in next generation wireless systems

The End-to-End BER Analysis of Two Simulated OFDM-RoF Systems

With the rapid grown of informational and visual services, larger capacity and higher-speed transmissions are demanded in today's cellular network, which makes the current wireless networks eventually fail to deal with the growing total traffic. As a result, the way of achieving large capacity and high-speed transmission has undoubtedly been a critical task for the next generation mobile service carriers. Radio-over- fiber (RoF) is one of the promising solutions to the exploding traffic, which can incorporate with Orthogonal Frequency Division Multiplexing (OFDM), namely OFDM-RoF, to resolve the capacity thirsty with relatively lower cost. In this thesis, two OFDM-RoF systems under different transmission schemes are studied regarding their end-to-end bit-error-rate (BER) performances. Particularly, a baseband OFDM-RoF system is simulated and analyzed by Matlab, where the nonlinear effect of the MZM transfer function will be focused in the first system, while the BER performance of the optical transmission line under various laser powers and fiber lengths will be considered in the second. Finally, the BER of the two systems are compared under different M-QAM modulations