Abstract
We present a novel optical orthogonal frequency division multiplexing
(O-OFDM) scheme, suitable for intensity-modulated direct-detection systems,
where the modulation/demodulation processing takes advantage of the fast
Hartley transform algorithm. Due to the properties of the discrete Hartley
transform (DHT), the conventional transmission scheme can be streamlined. We
demonstrate that asymmetrically clipping (AC) technique can also be applied
to DHT-based OFDM; the signal can be transmitted without the need of a DC
bias, resulting in a power-efficient system, not affected by clipping noise.
Hermitian symmetry is not required for the input signal. Therefore, this
technique supports the double of input symbols compared to both AC and
DC-biased O-OFDM, based on standard Fourier processing. The analysis in an
additive white Gaussian noise channel shows that the same performance can be
achieved by replacing 4, 16, and 64 QAM (quadrature-amplitude modulation) AC
optical-OFDM with a simpler system based on DHT, using binary phase-shift
keying (BPSK), 4 and 8 PAM (pulse-amplitude modulation),
respectively.
© 2010 IEEE
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription