Abstract:
Different variants of optical orthogonal frequency
divisions multiplexing (O-OFDM) have been proposed for
intensity modulation/direct detection (IM/DD) based indoor
optical wireless communication. Among those schemes, direct
current biased optical OFDM (DCO-OFDM) and
asymmetrically clipped optical OFDM (ACO-OFDM) are
widely adopted variants. These schemes have either reduced
spectral or power efficiencies, but the co-existence of both good
spectral and power efficiency is vital to tackle the challenge of
limited bandwidth and limited optical power constraint
scenarios. In this paper, simultaneous transmission of Multiple
ACO-OFDM frames on both even and odd subcarriers has been
proposed to achieve better spectral and energy efficiencies. The
analysis of the theoretical bit error rate (BER) performance of
the proposed scheme has been done and compared with the
result from Monte Carlo simulation for Additive white Gaussian
noise (AWGN) channel environment. A good agreement has
been achieved between the theoretical BER bound and the
simulated BER from Monte Carlo simulation. The proposed
scheme provides better spectral efficiency (SE) compared to
ACO-OFDM and equivalent SE compared to DCO-OFDM. In
addition, it has shown superior energy efficiency performance
than both ACO-OFDM and DCO-OFDM of equal SE.
