Blind Demodulation for CP-OFDM and ZP-OFDM transmission over frequency selective channels

In this paper, we focus our attention on blind demodulation for multi-carrier modulation in the context of radio surveillance and military applications. We present a blind demodulation technique for CP-OFDM and ZP-OFDM transmission over frequency selective channels. The technique exploits the cyclic prefix or zero padding structure of the transmitted signal to estimate the parameters and to demodulate the transmitted symbols without requiring any additional pilots. Simulation results are performed on various channel models with timing and frequency offsets. The presented technique shows that the different transmitted symbols can be retrieved whenever the channel exhibits some correlation in the time and frequency domains, i.e. as for instance in LOS channels.