Measurement results of frequency offset in DVB-C2 receiver

Abstract

I. INTRODUCTIONFO is caused by an oscillator of transceiver and dependent on the accuracy of an oscillator. In single carrier system, received QAM symbols are rotated due to FO, However, in multicarrier system such as DVB-C2 using OFDM, FO causes ICI among subcarriers and degrades the performance of a receiver [1]. Because FO of multicarrier system is more serious than single carrier system, it is preferable for FO estimator to have a fine resolution.When FO is normalized to subcarrier spacing in multicarrier system, it consists of IFO and FFO. FFO estimator using CP in time domain can extract only the FFO of FO. Thus, IFO is estimated in frequency domain using USS after FFT.We simulate the MSE of the FO estimation algorithm under AWGN with computer simulation and implement it with FPGAs. In addition, we measure the implemented FO estimator.