Performance analysis of noise cancellation in a diversity combined ACO-OFDM system

Abstract

In this paper we analyze the combined performance of noise-cancellation and diversity-combining in an ACO-OFDM system. Noise cancellation and diversity combining are two techniques which have each been shown to improve the performance of ACO-OFDM, each giving a maximum improvement of 3dB. As noise cancellation reduces the noise at the detection point, while diversity combining adds two different signal components, it might be expected that combining the two techniques could give further performance gains. In this paper we show analytically that no additional performance gain can be achieved by combining the techniques. Simulation results are presented which are consistent with the analysis. It is also observed that the noise cancellation is more computationally efficient than diversity combining.

A novel scheme for demodulation of ACO-OFDM in the presence of DC offset

“…It had been expected that joint utilization of the DCS and the PMLS can lead to further improvement. However, it was shown in [25] by both theoretical analysis and simulations that no additional benefit can be obtained by doing so. Most recently, Dang et al proposed an iterative minimum mean square error ACO-OFDM demodulator [26], which in some cases can achieve about 10 dB performance improvement, however its complexity is much higher than all the others.…”

“…Several schemes [14,[20][21][22][23][24][25][26] have been established for demodulation of ACO-OFDM. However, as a key challenge, improving the demodulation performance of ACO-OFDM in practical systems has not been well addressed.…”

Enhancing the performance of optical VLC system based on asymmetric symmetric subcarriers OFDM

“…In Dissanayake and Armstrong, this is done at the price of lowering the transmitted data rate by a factor of half. Only odd subcarriers at the input of the IFFT block are used at the transmitter while setting the values of the even subcarriers to zeros . Figure shows the ACO‐OFDM system block diagram.…”

“…The drawback of this system is the degradation of bit error rate (BER) performance due to the added DC‐biasing level to the transmitted signal compared with the other existing systems . In previous studies, asymmetrically clipped optical (ACO)‐OFDM system is proposed. In this system, only odd subcarriers are used at the input of the IFFT block while even subcarriers are set to zero values.…”

Performance evaluation of multi-gigabit indoor visible light communication system

“…A prism array based receiver has been investigated to provide angular diversity to mitigate the effects of ISI [13]. OFDM is a modulation technique that is extensively used in VLC systems as it successfully combats ISI caused by multipath propagation [14], [15].…”