Abstract
This paper provides experimental results for a multi-user visible light communications system using multi-band carrier-less amplitude and phase (m-CAP) modulation scheme. We optimize the system performance by adapting pulse shaping filter parameters, subcarrier spacing and allocating different baud rates to individual sub-bands called allocated m-CAP (Am-CAP). We show that a maximal system data rate of ∼468 Mb/s for four users can be supported while gaining higher flexibility for optimization and the same or lower computational complexity compared with the conventional m-CAP scheme.
Highlights
In recent years, visible light communication (VLC) has received a growing interest within both industrial and academic communities as a complementary technology to the radio frequency wireless systems in 5G and beyond networks [1]
An alternative to orthogonal frequency division multiplexing (OFDM) is the carrierless amplitude and phase (CAP) modulation scheme, which has been investigated in intensity modulation and direct detection (IM-DD) VLC systems offering relatively higher Rb compared with OFDM using electrical components of limited bandwidth and lower complexity
Is known as an expanded non-orthogonal super-Nyquist multi-band carrier-less amplitude and phase (m-CAP) (m-ESCAP). Another alternative approach is based on splitting the signal into unequally spaced subcarriers, which is known as variable m-CAP (Vm-CAP) that offers a ∼30% improvement in Rb for a bandlimited VLC link with 6 subcarriers compared with the conventional 6-CAP and reduced computational complexity [14]
Summary
Visible light communication (VLC) has received a growing interest within both industrial and academic communities as a complementary technology to the radio frequency wireless systems in 5G and beyond networks [1]. In [13], an additional 20% improvement in the data rate was achieved by increasing the baud rates of individual non-orthogonal sub-bands while utilising the same signal bandwidth. This technique is known as an expanded non-orthogonal super-Nyquist m-CAP (m-ESCAP). Another alternative approach is based on splitting the signal into unequally spaced subcarriers, which is known as variable m-CAP (Vm-CAP) that offers a ∼30% improvement in Rb for a bandlimited VLC link with 6 subcarriers compared with the conventional 6-CAP and reduced computational complexity [14]. In [17], the scheme for 5G mobile networks combining m-CAP and non-orthogonal multiple access (NOMA) was experimentally evaluated over the W-band millimeter wave radio-over fiber system
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