Data hiding capacity of spatial domain bit replacement steganography in an MIMO-OFDM coding channel

Based on the data hiding principle in the error correction coding channel, a data hiding system based on spatial domain LSB steganography and a capacity analysis model for an MIMO-OFDM coding channel are presented. The hiding capacity equation for the MIMO-OFDM coding channel is proposed and verified by analysis and experimental results. Then, the effect of the OFDM parameters, the FFT length and the guard interval on the data hiding capacity performance is also analysed. In addition, the impact of the antenna diversity technique, the maximum multi-path delay and the Doppler shift on the BER performance of the MIMO-OFDM data hiding system is presented and analysed. Finally, the data hiding capacity of the MIMO-OFDM channel is compared with the hiding capacity performance of the SISO channel, the OFDM channel and the MIMO channel in a MATLAB simulation. According to the experimental results, under the same conditions, the BER of the carrier data, the accuracy of the secret data and the data hiding capacity in the MIMO-OFDM system are better than those in the SISO, OFDM and MIMO coding channel systems.