noise insensitive sampling frequency offset estimation methods for dvb-t/h systems
A precise estimation and compensation of SFO (Sampling Frequency Offset) is an important issue in OFDM (Orthogonal Frequency Division Multiplexing) system, because sampling frequency mismatch between the transmitter and the receiver dramatically degrades the system performance due to the loss of orthogonality between the subcarriers. However, the conventional SFO estimation method has serious performance degradation due to SNR (Signal to Noise Ratio) loss caused by the complex conjugate multiplications in time and frequency domain. Therefore, in this paper, we propose two SFO estimation methods which include noise mitigation processes to reduce the SNR loss. The proposals for SFO estimation / compensation are mainly based on DVB (Digital Video Broadcasting) system, and we verified that the proposed method has a good performance and stable operation through extensive simulation.
sampling frequency offset dvb-t/h ofdm noise mitigation iterative interpolation