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Improvement in bit error rate performance of asymmetrically-clipped optical orthogonal frequency-division multiplexing (ACO-OFDM) is achieved through proposed modification by using unipolar encoding. This modification eliminates the 3 dB difference between ACO-OFDM performance and bipolar OFDM. Keywords— asymmetrically-clipped optical orthogonal fr...
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Citations
... The paper reports an approach to improving the performance of ACO-OFDM by utilising unipolar encoding; the proposed technique is referred to as Modified ACO-OFDM (MACO-OFDM) [21,22]. A detailed Bit Error Rate (BER) performance analysis is developed and Monte Carlo simulations are carried out to verify the analysis. ...
... In order to provide a meaningful estimation of system performance and in support of the analytical framework, a series of simulations were undertaken. A number of simulation approaches are commonplace but here, Monte Carlo is adopted since it has been proven to be the most efficient and is commonly used for the evaluation of communication systems [5,21]. The methodology emulates the behaviour of each system component taking into account all possible operational states. ...
Dimming control is one of the main challenges for Visible Light Communication (VLC) which is a promising candidate for future short distance wireless communications. To this end, the principles of two dimming control methods, i.e. continuous current reduction (CCR) and pulse width modulation (PWM), employed in optical OFDM system were discussed, and also a new dimming control scheme was proposed in this paper. CCR and PWM were applied in unipolar OFDM (U-OFDM) system, which can achieve better performance in terms of both power efficiency and bit error rate. This scheme can make sure that lighting signal will be adjusted continuously and linearly while maintaining a reliable communication link. Simulation results demonstrate that dimming control performance of this new scheme is equally good as asymmetrically clipped optical OFDM (ACO-OFDM), and the bit error rate is better than the latter. The U-OFDM system using dimming control can obtain better error performance in the mean time without sacrificing illumination quality. ©, 2015, China National Publishing Industry Trading Corporation. All right reserved.
