Abstract
The huge bandwidth and immunity to electromagnetic interference make Visible Light Communication (VLC) systems as preferred technique for designing the physical layer of 5G applications. Unfortunately, the superimposition of multiple subcarriers in DC-biased Optical Orthogonal Frequency Division Multiplexing (DCO-OFDM) system leads to a high peak to average power ratio (PAPR). The well-accepted nondistorting PAPR reducing schemes like selective mapping (SLM) require an obligatory transmission of side information (SI) reducing the bandwidth efficiency of the system. To address these issues, a simple SI cancellation algorithm using pilots associated with channel estimation is proposed in this work. In short, the DCO-OFDM system is presented with a modified cluster architecture and each cluster is assigned with at least one pilot. Every cluster is restricted to have same phase and this idea provides the pilots to perform joint channel estimation and SI cancellation. The experimental results obtained by using Universal Software Radio Peripheral (USRP) as hardware and LabVIEW as software indicate a significant reduction in PAPR without effecting the real-time channel response.
Highlights
Light Emitting Diode (LED) based communication has attracted the attention of researchers due to its astounding features like low interference, simultaneous illumination and lesser impact on human health [1]
We introduce the idea of performing channel estimation and side information (SI) cancellation by using the pilots associated with channel estimation
This paper presents a simple SI cancellation algorithm using pilots associated with channel estimation for improving the bandwidth efficiency of the system
Summary
Light Emitting Diode (LED) based communication has attracted the attention of researchers due to its astounding features like low interference, simultaneous illumination and lesser impact on human health [1]. The tremendous growth in the number of data accessing devices forced the 5G applications like Internet of Things (IOT) to provide high data rate, high spectral efficiency at low power requirements In this regard, the extremely wide bandwidth of VLC has drawn the attention worldwide and can be considered as ideal choice for designing the physical layer of 5G systems [3]. It is difficult to manufacture LED with a large linear range and the peaks are often clipped resulting in an increase of Bit Error Rate (BER) of the system This scenario makes reduction of PAPR as a challenging task and the prominent problem for real-time VLC systems [7]
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