Carrier-less amplitude and phase (CAP) modulation schemes have been actively explored in visible light communication (VLC) because of its high spectral efficiency and simpler transceiver design. Conventionally, CAP with root-raised-cosine filter (CAP-RRC) has been explored for VLC. However, in this paper, we have implemented CAP with a Gaussian minimum shift keying filter (CAP-GMSK) in order to improve the system performance. The proposed scheme is compared against CAP-RRC and baseline DCO-OFDM, on the basis of symbol error rate (SER) and peak-to-average power ratio (PAPR) performance. The result shows that as compared to DCO- OFDM, CAP-GMSK and CAP-RRC provides a SNR gain of 8 and 1 dB and PAPR improvement of 2.5 and 2.3 dB respectively.
In this paper, we have proposed a novel modulation scheme for visible light communication (VLC), that has two preprocessing blocks namely, discrete Fourier transform (DFT) block and frequency domain signal shaping block, prior to conventional optical-orthogonal frequency division multiplexing (O-OFDM) modulation. Two variants of proposed scheme namely, with and without DC have been implemented so as to make it compatible with intensity modulation and direct detection (IM/DD). The results of the proposed schemes are compared against their standard O-OFDM counterparts based on peak-to-average power ratio (PAPR) and symbol error rate (SER). Results show that the proposed scheme has significantly lower PAPR and better SER as compared to corresponding O-OFDM counterpart.
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