Thank you for your further explanation Dhiman. I know how MSK can be beneficial in systems you have mentioned and I don’t say it may not be in your case, but I cannot see how. In OFDM component, after the IFFT stage, the signal shape will be completely changed (the frequency domain waveform changes to the time domain waveform of the signal). So the time signal whose frequency has better bandwidth efficiency is converted to another waveform and its spectrum is changed as a result. Am I right?