Improved receiver design for layered ACO-OFDM in optical wireless communications

Wang, Qi, Wang, Zhaocheng, Guo, Xuhan and Dai, Linglong (2016) Improved receiver design for layered ACO-OFDM in optical wireless communications. IEEE Photonics Technology Letters, 28 (3), 319-322. (doi:10.1109/LPT.2015.2495320).

Record type: Article

Abstract

Layered asymmetrically clipped optical orthogonal frequency division multiplexing (LACO-OFDM) is recently proposed for intensity-modulated directed-detected optical wireless communications, which achieves higher spectral efficiency compared with the conventional ACO-OFDM, since different layers of ACO-OFDM signals are combined to utilize more subcarriers. In this letter, an improved receiver is proposed for LACO-OFDM, which distinguishes different layers of ACO-OFDM signals in the time domain. After that, the structure of ACO-OFDM signals in each layer is exploited to further reduce the noise and inter-layer interference, resulting in the improved performance. Simulation results show that the proposed receiver for LACO-OFDM achieves significant gain over its conventional counterpart.

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