Near-Optimal Low-Complexity Harmonic Receiver for Unipolar-FSK

A. W. Azim (1) , M. J. Khan (2) , O. de Wulf (2) , Yannis Le Guennec (2) , G. Maury (3) , Laurent Ros (2)

1 University of Engineering and Technology Taxila
2 GIPSA-GAIA - GIPSA Pôle Géométrie, Apprentissage, Information et Algorithmes
3 IMEP-LAHC - Institut de Microélectronique, Electromagnétisme et Photonique - Laboratoire d'Hyperfréquences et Caractérisation

In this letter, we propose a near-optimal lowcomplexity frequency-domain (FD) harmonic receiver for visible light communication based unipolar frequency-shift keying (U-FSK). The time-domain (TD) maximum-likelihood (ML) receiver for U-FSK is computationally complex, while the sub-optimal receiver increases the noise variance. The proposed harmonic receiver determines the transmitted frequency from the crosscorrelations between the FD received waveform and the FD dictionary waveforms reduced to their strongest harmonics. The results shall demonstrate that besides affording a linerarithmic complexity, the performance of the harmonic receiver closely approaches that of TD ML receiver which exhibits quadratic complexity.

Mots clés: Discrete cosine transform; intensity-modulation and direct-detection; visible light communications; harmonic receiver; frequency-shift keying

Domaines: Traitement du signal et de l'image [eess.SP]

A. W. Azim, M. J. Khan, O. de Wulf, Yannis Le Guennec, G. Maury, et al.. Near-Optimal Low-Complexity Harmonic Receiver for Unipolar-FSK. IEEE Wireless Communications Letters, 2021, 10 (11), pp.2421-2425. ⟨10.1109/LWC.2021.3102123⟩. ⟨hal-03324540⟩