• Special Focus: Optical Wireless Communication •

Position encoded asymmetrically clipped optical orthogonal frequency division multiplexing in visible light communications

Saied Osama1(),Ghassemlooy Zabih1,3(),Tang Xuan2(),Dai Xuewu1(),LeMinh Hoa1(),Lin Bangjiang1()

1. 1 Optical Communications Research Group,NCRLab,Faculty of Engineering and Environment,Northumbria University,Newcastle Upon Tyne NE18ST,UK
2 Quanzhou Institute of Equipment Manufacturing,Haixi Institutes,Chinese Academy of Sciences,Quanzhou 350001,China
3 College of Engineering,Huaqiao University,Quanzhou 362021,China
• Online:2017-12-25 Published:2017-12-29
• Supported by:
the EPSRC research grant

Abstract:

A PE-ACO-OFDM (Position-Encoded Asymmetrically Clipped Optical Orthogonal Frequency Division Multiplexing) signaling scheme for intensity modulation and direct detection is introduced in this paper,where the anti-asymmetry characteristics of ACO-OFDM are exploited to improve the rate of data transmission.This is achieved by reducing the symbol duration of the ACO-OFDM signal,where only the first half of ACO-OFDM is used to transmit the ACO-OFDM data symbol after inverting its negative samples to positive ones.In addition,encoded ACO-OFDM samples are combined with every ACO-OFDM symbol to allow the receiver to identify the position of the inverted samples.Simulation results are introduced,and it is shown that the data rates of PE-ACO-OFDM improve by 33% compared with ACO-OFDM,when a 256-quadrature amplitude modulation scheme is considered as the encoded constellation order.It is also shown that the signal to noise ratio of the proposed PE-ACO-OFDM is higher by almost 1 dB compared with the traditional ACO-OFDM.

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