Simulación de los detectores SQRD y MMSE-SQRD en un sistema OFDM con un canal variante en el tiempo usando matlab.

Abstract

In this final project, the simulation of a time-varying channel is carried out, using the OFDM (Orthogonal Frequency-Division Multiplexing) technique and using the detectors ZF (Zero-Forcing), MMSE (Minimum Mean Squared Error), QRD (QR Decomposition), SQRD (Sorted QR Decomposition) and MMSE-SQRD. In order to determine the detector that represents the best performance, the results are graphically presented by displaying the BER (Bit Error Rate) vs Eb/No (Energy per Bit to the Spectral Noise Density) comparison. In addition, there is a computational cost analysis based on the time of execution of each of the detectors. Chapter 1 details the theory related to OFDM technique, the wireless channel and its effects, the IEEE 802.11p standard, the characteristics and algorithms of the ZF, MMSE, SQRD and MMSE-SQRD detectors. Chapter 2 presents the methodology used. There is an explanation of how the code was done to create de channel and the detector. Chapter 3 details the results obtained. The graphics about BER vs Eb/No and a comparative analysis are presented. A compilation of the execution times of each detector and its analysis is also presented. Finally, chapter 4 shows the conclusions obtained after completing the degree work and the suggested recommendations for subsequent works.