Simulación de estimación de canal y sincronización en la técnica de comunicación inalámbrica SEFDM: simulación de STO (Symbol time Offset) en SEFDM.

Abstract

This work presents the simulation of a SEFDM (Spectrally Efficient Frequency Division Multiplexing) system where synchronization is performed in the time domain and mainly STO (Symbol Time Offset) estimation is performed. Three STO estimation techniques are used in the system receiver where the cyclic prefix and the preamble are used to determine the beginning of the symbol. The SEFDM system allows compressing the bandwidth by adding zeros to the signal and in its synchronization stage is important to recognize how the STO effect is added, estimated, and compensated. The first chapter provides a theoretical review of the SEFDM system and time synchronization. It also reviews the STO estimation techniques to be implemented for the system. In the second chapter, the code developed in MATLAB is described and the transmitter and receiver are explained by means of block diagrams. In the transmitter, special emphasis is made on the construction of the preamble, for the receiver the emphasis is made on the synchronization stage. To conclude the work, the third chapter presents the results with their corresponding analysis of the most relevant simulation scenarios, for which the different types of modulation and specific values of bandwidth compression factor are used. These results are presented with graphs of the BER (Bit Error Rate) and Eb/No (Energy per-bit to noise power density ratio). Finally, the conclusions are presented along with recommendations for possible future work.