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In this paper, three forms of orthogonal frequency division multiplexing (OFDM) designed for intensity modulated/direct detection (IM/DD) optical systems are compared. These are asymmetrically clipped optical OFDM (ACO-OFDM), DC biased optical OFDM (DCO-OFDM) and asymmetrically clipped DC biased optical OFDM (ADO-OFDM). ADO-OFDM is a new technique that combines aspects of ACO-OFDM and DCO-OFDM by...
This paper describes the use of Alamouti coding in indoor optical wireless systems using asymmetrically clipped optical OFDM. The performance is compared with systems in which the same signal is simultaneously transmitted from both transmitters. Expressions are calculated for the signal to noise ratio as a function of distance between the transmitters and receivers for the case where there is line...
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