Cyclostationary detection of 5G GFDM waveform in cognitive radio transmission

Generalized frequency division multiplexing (GFDM) is a new flexible multicarrier waveform. With the flexibility of pulse shaping techniques and a tail-biting cyclic prefix, it has very low out of band leakage. This makes this potential 5G waveform suitable for cognitive radio opportunistic access with lower interference to the adjacent legacy/primary users. Because of the per-subcarrier pulse shaping technique, the cyclostationary autocorrelation properties of GFDM produces extra correlation peaks at particular cyclic frequencies. Cyclostationary detection based on these side peaks improve the spectrum sensing of GFDM over traditional OFDM. The GFDM receiver with ICI cancellation unit mitigates the ICI for any values of the roll-off factor, and hence, increasing the roll-off factor does not impact the BER performance of the GFDM system. This paper highlights the innovative cyclostationary properties of GFDM and studies the effect of pulse shaping roll-off factors on detection performance.