Search for: [Description = "Light fidelity \(Li\-Fi\) systems based on the orthogonal frequency division multiplexing \(OFDM\) scheme have gained more attention in the communications circles, as a means to provide high spectral efficiency and ensure stricter data rate requirements for visible light communication \(VLC\) systems. However, common OFDM schemes employ Hermitian symmetry to obtain a real\-valued signal which is necessary in intensity modulation and direct detection \(IM\/DD\) optical systems, at the expense of doubling the required bandwidth. In this paper, a novel transmission scheme for an OFDM\-based Li\-Fi system is proposed to tackle the issue in question. A new approach to complex signal mapping \(CSM\), based on the pairing function method, has been developed for Li\-Fi systems. It does not require Hermitian symmetry and, hence, saves about 50% of the required bandwidth. Unlike existing OFDM\-based VLC approaches, the proposed scheme employs CSM to ensure a real and positive signal without Hermitian symmetry in order to fully utilize the bandwidth available to Li\-Fi networks. Simulation results show that the proposed scheme significantly outperforms other systems in terms of spectral efficiency. The CSM\-OFDM based Li\-Fi system also achieves a good peak\-to\-average power ratio \(PAPR\) reduction with acceptable bit\-error\-rate \(BER\) performance, compared to conventional approaches."]

Number of results: 1