Evaluation of Multi-band Carrier-less Amplitude and Phase Modulation Performance for VLC under Various Pulse Shaping Filter Parameters
Evaluation of Multi-band Carrier-less Amplitude and Phase Modulation Performance for VLC under Various Pulse Shaping Filter Parameters
复制标题
不同脉冲整形滤波器参数下 VLC 多频段无载波调幅和调相性能评估
作者：
P. Chvojka;P. Haigh;S. Zvánovec;P. Pesek;Zabih Ghassemlooy
在多带无载波幅度和相位调制（m-CAP）中，发射端和接收端的脉冲成形滤波器对信号性能有很大的影响。由于m-CAP是一种新兴的和有前途的调制格式的可见光通信（VLC），它是必要的，以平衡系统的性能和滤波器的长度，由于有限的现场可编程门阵列（FPGA）的集成密度。本文研究了在不同的有限脉冲响应（FIR）滤波器参数（如滤波器长度Lf和滚降因子β）下，不同子带数m = {2，5，10}的m-CAP VLC系统性能。我们表明，增加β和Lf大大提高了系统的误码率（BER）性能。我们证明了使用Lf ≤ 12个符号（m = 5和10）实现10-4的BER目标。此外，通过所有子载波达到了β = 0.2的BER极限，除了m = 5和10的最后两个子载波，这是一个显著的改进，即使考虑到与文献相比略微增加的额外带宽。
In multi-band carrier-less amplitude and phase modulation (m-CAP), the transmitter and receiver pulse shaping filters have a significant impact on the signal performance. Since m-CAP is an emerging and promising modulation format for visible light communications (VLC), it is necessary to balance the system performance and the filter length, due to limited integration density in field programmable gate arrays (FPGAs). In this paper we investigate the m-CAP VLC system performance for different number of sub-bands m = {2, 5, 10} under varying finite impulse response (FIR) filter parameters, such as the filter length Lf and the roll-off factor β. We show that increasing both β and Lf improves the bit error rate (BER) performance of the system substantially. We demonstrate that a BER target of 10-4 is achieved using Lf ≤ 12 symbols for m = 5 and 10 for low order subcarriers. Moreover, the BER limit is attained for β = 0.2 by all subcarriers, except the last two for m = 5 and 10, which is a significant improvement, even considering the slightly increased excess bandwidth in comparison to the literature.