Non-coherent Optical FBMC Signals based on Extended Gaussian Function well Time-Frequency Localized filters.

This work presents an analysis of the time-frequency localization (TFL) property of extended Gaussian function (EGF) function for the first time in non-coherent optical filter bank multicarrier (FBMC) signals. The proposed system is exploited to overcome the degradation performance with isotropic orthogonal transfer algorithm (IOTA) filter for high transmission rate demands in next generation visible light communications. Comprehensive investigation reveals that the suppression impact of intrinsic imaginary interference (IMI) in Flip-FBMC burst can be delivered by maximizing the amplitude level of pseudo-pilots and minimizing noise floor beyond 60 dB. Thus, a superior performance is obtained over IOTA Flip-FBMC at low channel delays by using the promising property of high spreading factors (a) in EGF filter. Also, the proposed scheme offers better performance compared to optical OFDM at several propagation scenarios. However, a factors larger than 2.9 lead to a severe degradation in frequency response. Thereby a reduction in the main to side lobe ratio to -17.7 dB is resulted. Hence, an interfering retrieved signals is reported even at ideal transmission of a noise-free channel. However, the improvement in system robustness against IMI is more evident for the isotropic property of IOTA with Heisenberg factor (approximate to 1) over high delay spread paths with higher constellations mapping.