A timing synchronization method for ACO-OFDM optical wireless communications based on superposition of training and data

作者：Wang R Y^*; Wang Z; Wu D P; Gao D; Zuo Q H; Zhao H; Shangguan S T

来源：Acta Electronica Sinica, 2012, 40(1): 162-166.

DOI：10.3969/j.issn.0372-2112.2012.01.026

• Asymmetrically clipped optical orthogonal frequency division multiplexing
• Optical wireless communications
• Superimposed training
• Timing synchronization

A new synchronization method for asymmetrically clipped optical orthogonal frequency division multiplexing (ACO-OFDM)-based optical wireless communications systems with the superimposed m sequence is proposed. The pseudo-noise (PN) sequence modulated by ACO-OFDM as training sequence is sent with a data symbol in the same symbol cycle. Receiver by using local sequence and the received signal correlation operation, accumulates the energy of the superimposed training sequence in order to achieve timing synchronization. Via simulation, both in LOS channel and diffuse channel, the proposed method has better synchronization accuracy, lower timing offset estimator variance, and the flexibility of time and power allocation, improves the bandwidth efficiency.

• 出版日期2012
• 单位test