Diseño e implementación en FPGA del algoritmo CORDIC vectorial y rotacional para sincronismo de un sistema OFDM

Abstract

In this thesis we present the implementation of the estimation and correction of frequency offset for an OFDM system in FPGA, using the IEEE 802.11a preamble symbols. For the detection of the CFO, the CORDIC algorithm was implemented in vectoring mode (for the estimation of the phase) and in rotational mode (for the estimation of the complex exponential) considering the relationship between the algorithm error (the difference between calculated value and real value) with the number of iterations of CORDIC. For the implementation of the synchronization algorithm, the STS symbols of the preamble were used, thus making a coarse estimation of the frequency offset. To verify the performance of the algorithm, OFDM symbols were generated with frequency deviation of 100 kHz (typical deviation value for this type of standard). The results obtained show the robustness of the algorithm implemented for the frequency synchronization of an OFDM system.