Abstract
An efficient multi-channel hybrid fiber-radio scheme for both
down and up-link paths is demonstrated based on digitized
RF-over-fiber technique, where the frequency translation stages are
implemented using a single analog-to-digital converter (ADC) and
digital-to-analog converter (DAC) instead of mixers and local
oscillators. The simultaneous transmission of GSM, UMTS and WiMAX
services is demonstrated with error-free reception. With a minimum
sampling rate of 50 MHz and an overall optical data rate of 400
Mb/s, all the three wireless services can be successfully recovered
in a full-duplex transmission. In the downlink direction, the
performance is dependent on the amount of amplification required for
the wireless signal at the desired carrier frequency. The amount of
amplification on the other hand is dependent on the location of the
wireless signal within the Nyquist zone which increases
significantly with the order of the Nyquist zone. In the uplink
direction, the performance is limited by inter-channel interference
as a result of spectra aliasing of the regenerated IF signals which
limits the signal-to-noise-ratio. With proper system design that
optimizes downlink amplification and minimizes inter-channel
interference, simultaneous multi-service transmission using
digitized RF-over-fiber technique is able to improve spectral
efficiency and minimize hardware count.
© 2011 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