Enhanced Flip-FBMC visible light communication model

Abstract

<p>VLC technology is one of the most promising technologies in the generations of communications, especially 5G after the significant development of optical semiconductors, specific laser diode, and the use of FBMC modulation in the system. DCO-FBMC modulation surpasses all the disadvantages of DCO-OFDM modulation techniques, as it is characterized by high speed and large bandwidth, but this technique consumes high energy when converting a real bipolar signal into a positive unipolar by adding DC-bias. Besides the challenge of illumination distribution indoor typical room, where the drop of the illumination appears in the middle of the room, besides the power consumption. The Flip-FBMC technique was proposed to solve this challenge, which helps convert the bipolar signal into unipolar by separating the positive part from the negative part and converting it into positive and merging it using Multiplexer and then sending the signal. Besides this, the authors presented in this paper a new lighting model with 5 luminescent units, using LD instead of LED. The Flip-FBMC profile gave better energy savings and BER performance than DCO-FBMC, besides a lighting model that covers dark areas and gives high SNR for the blind area and give save power 13.14% from consumed power.</p>

A complexity efficient PAPR reduction scheme for FBMC-based VLC systems

“…Thanks to its higher spectral efficiency, DCO-FBMC is widely used in the FBMC-based VLC system. However, higher consuming energy is a clear challenge when obtaining a positive unipolar signal from a real bipolar one [35]. As a result, it is essential to replace DC bias with another fast and efficient approach that involves minimum losses in spectral efficiency and energy consuming.…”

Opto-Electronics Review

“…The signal transmitted by the LED is reflected many times due to the multipath propagation environment, which includes walls, floors, ceilings, furniture, and other objects. Hence, in addition to the line of sight (LOS) component, there are several non-line-of-sight (NLOS) components [22][23][24][25][26][27][28].…”

“…To ensure a successful detection, the received signal must be within the range of the photodiode FOV; otherwise, the received signal will not be detected if it is outside the range of the receiver FOV [21][22][23][24][25]. Consequently, the detector can be modelled as an active area (APD) that collects radiation incident at angles 𝜓 smaller than the FOV of the detector [25][26][27].…”

Performance improvement of visible light communication links based on coded unipolar OFDM

“…To address these problems, researchers have turned to O-OFDM approaches such as DC-biased optical OFDM (DCO-OFDM), unipolar-OFDM (U-OFDM, and asymmetrically clipped optical OFDM (ACO-OFDM) to reduce the ISI [8], [9], provide highspeed, and wide-bandwidth data transmission [6]. Two conditions constrain the O-OFDM signal: its amplitude must be real and positive because VLC systems use the intensity modulation/direct detection (IM/DD) approach [10]- [15]. To achieve the real condition in the three types of O-OFDM (ACO-OFDM, U-OFDM, and DCO-OFDM), the property of the Hermitian symmetry (HS) can be adopted before the process of inverse fast Fourier transformation (IFFT) to create a bipolar signal in DCO-OFDM, ACO-OFDM, and U-OFDM.…”