A wireless communication system includes a first communication device and a second communication device. The first communication device includes a modulator configured to provide modulation and a first coupler configured to wirelessly transmit a signal. The second communication device includes a second coupler configured to wirelessly receive a signal by being coupled to the first coupler by at least one of electric-field coupling or magnetic-field coupling and a demodulator configured to provide demodulation. The first communication device or the second communication device includes an equalizer configured to provide equalization.