Channel estimation for asymmetrically clipped optical orthogonal frequency division multiplexing communication system

Hui Zhao; Minghui Li; Ruyan Wang; Dapeng Wu

doi:10.1117/1.OE.52.7.076111

15 July 2013 Channel estimation for asymmetrically clipped optical orthogonal frequency division multiplexing communication system

Hui Zhao, Minghui Li, Ruyan Wang, Dapeng Wu

Author Affiliations +

Optical Engineering, Vol. 52, Issue 7, 076111 (July 2013). https://doi.org/10.1117/1.OE.52.7.076111

Abstract

The channel estimation problem for asymmetrically clipped optical orthogonal frequency division multiplexing wireless communication systems is investigated. In order to resolve the noise-sensitive problem of traditional least squares-based channel estimation method, a new channel estimation method which is based on superimposed training sequence and guarantees the linear minimum mean square error estimate is proposed. Cycle training sequence is added at variable power ratio to the information sequence at the transmitter prior to transmission. Then, statistical average method is employed to separate training and information sequences at the receiver. Simulation results show that the power ratio of training sequence needs to balance between the mean square error (MSE) of estimation and the error bit rate. Moreover, compared with the traditional least squares-based method, the proposed method has significantly improved the estimation performance under the condition of low signal-to-noise ratio, especially, when the MSE of the estimation reduces 1 to 2 orders.

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Hui Zhao, Minghui Li, Ruyan Wang, and Dapeng Wu "Channel estimation for asymmetrically clipped optical orthogonal frequency division multiplexing communication system," Optical Engineering 52(7), 076111 (15 July 2013). https://doi.org/10.1117/1.OE.52.7.076111

Published: 15 July 2013

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