earticle

영어

In this paper, we propose a simple OFDM (orthogonal frequency division multiplexing) frame synchronization scheme for high-speed LED communication systems. Frame synchronization is an essential procedure for normal operation of the OFDM systems on account of sensitivity to synchronization errors. In order to enhance the OFDM frame synchronization performance, we add a repeated orthogonal Gold sequence (ROGS) directly to OFDM signals in the time domain. The power level of a ROGS needs to be low enough in order not to affect a normal operation of the LED communication systems. Frame synchronization can be achieved successfully over optical channels interfered by impulsive noise owing to good auto-correlation properties of the ROGS.