Abstract
An enhanced subband index carrierless amplitude and phase modulation (eSI-CAP) scheme is developed to improve the spectral efficiency of the multiband CAP (
$m$
-CAP) in visible light communication (VLC) systems. Using indexing technique and a dual distinguishable constellations, the eSI-CAP carries information bits by modulating symbols on the subbands of
$m$
-CAP. It also encodes additional information bits on the selection of the subband indices that is modulated with the dual constellation symbols. The performance advantage of eSI-CAP is demonstrated through theoretical analysis, computer simulations and VLC experimental validations. In addition, a novel maximum likelihood detector is developed for eSI-CAP with the same order of complexity as the conventional
$m$
-CAP detector. On comparison with
$m$
-CAP, eSI-CAP requires lower signal-to-noise ratio (SNR) per bit (
$\gamma _b$
) to reach a fixed data rate (
$R_\text{b}$
). Alternatively, when the
$\gamma _b$
is fixed, it achieves a higher
$R_\text{b}$
for a target BER. The results show that eSI-CAP is very attractive for VLC systems due to its flexible configuration and its improvement of the power efficiency of the conventional
$m$
-CAP modulation scheme.
© 2019 IEEE
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