Simulation of Real-OFDM Modem with Robust Frequency Offset Estimation in HF Channel for FPGA Implementation

In this paper, design and simulation of the orthogonal frequency-division multiplexing (OFDM) HF modem conforming to MIL-STD-188-110B is discussed and it's parameters are introduced. This modem is different from typical OFDM systems because of removing quadrature component(Q) by using real value OFDM(Real-OFDM). frequency offset synchronization of the this modem in the HF channel using Hilbert transform, is done by a low complexity robust algorithm that it is appropriate for implementing on the FPGA. Using this method, frequency offset can be estimated twice of the subcarrier spacing at very low signal-to-noise ratios (SNR's) and with appropriate mean square error (MSE

Keywords:

FPGA , OFDM , Hilbert Transform , carrier frequency offset , HF channel