Abstract
In order to achieve diversity gain of multi-color LED channels in visible light communication systems, we present an innovative method which transmits inversely interleaved signal combinations, yielding real signals for optical orthogonal frequency division multiplexing (OOFDM). The proposed scheme transmits two groups of signals carrying the same information through two different color LED channels. Since the Hermitian symmetry is no longer needed, the data rate remains the same as conventional OOFDMs like DC-biased optical OFDM (DCO-OFDM) and asymmetrically clipped optical OFDM (ACO-OFDM), while diversity gain of over 2 dB is achieved at the bit error rate (BER) of 10−5 compared to the conventional OOFDMs, which is verified by experimental simulations.
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