Abstract
In this paper, for the first time, we propose and experimentally demonstrate a novel pairwise coding (PWC)-based multiband carrierless amplitude and phase (mCAP) modulation with chaotic dual-mode index modulation (DM) for secure bandlimited visible light communication (VLC) systems. The combination of mCAP and DM can sustain a higher spectral efficiency (SE) compared with mCAP with conventional index modulation (IM), while PWC can be employed to efficiently mitigate the signal-to-noise ratio (SNR) imbalance caused by the low-pass frequency response of light emitting diodes (LEDs). Moreover, the DM is enhanced by a two-dimensional (2D) chaotic encryption scheme to guarantee the security of the useful information in VLC systems. Simulation and experimental results successfully verify the superiority of the proposed PWC-based mCAP-DM scheme with two-level chaotic encryption over other benchmark schemes.
Highlights
Visible light communication (VLC) utilizing commercially available light emitting diodes (LEDs) has become more appealing to the sixth generation (6G) and Internet of Things (IoT) systems, due to its enormous merits of abundant and unregulated spectrum resources, no electromagnetic radiation and high security [1,2]
In our simulations and experiments, we considered the 4CAP case in which the overall bandwidth is divided into four subbands, i.e., m = 4
It can be clearly seen that 4CAP-dual-mode index modulation (DM) requires a lower signal-to-noise ratio (SNR) to reach the 7% forward error correction (FEC) coding limit of bit error rate (BER) = 3.8 × 10−3 in comparison to 4CAP-index modulation (IM)
Summary
Visible light communication (VLC) utilizing commercially available light emitting diodes (LEDs) has become more appealing to the sixth generation (6G) and Internet of Things (IoT) systems, due to its enormous merits of abundant and unregulated spectrum resources, no electromagnetic radiation and high security [1,2]. Analog or digital equalization techniques can be applied to break the limited bandwidth of LEDs [4,5] For another thing, various spectrally efficient modulation and multiple access techniques, including carrierless amplitude and phase (CAP). CAP (mCAP) has been further proposed, which splits the available signal bandwidth into m subbands so as to improve the tolerance against the low-pass effect of LEDs [10]. A novel mCAP with index modulation (mCAP-IM) technique has been proposed to obtain better bit error rate (BER) performance than classical mCAP. In [13], a novel high-dimensional (HD) noncoherent detection scheme was proposed for multiintensity-modulated ultraviolet communication (UVC) systems to address the intersymbol interference (ISI) issue. For practical mCAP-DM VLC systems, the signal-to-noise ratio (SNR) of high-frequency subbands imposes inevitable degradation compared with that of low-frequency subbands. The superiority of the proposed mCAP-DM scheme was successfully verified by both numerical simulations and hardware experiments
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