Abstract
This paper investigates the different transport schemes for delivery of high-frequency broadband OFDM
signals via fibre-wireless links. We have investigated analog RoF, digitized RoF, and sampled RoF transport schemes
and experimentally demonstrated the transmission of broadband RF-OFDM signal using these schemes. Analog RoF results
in the simplest BS/RRH configuration but it demands for large optical bandwidth. The performance of this transport
scheme is limited by inter-modulation distortion (IMD) and RF power fading. For the digitized RoF transport scheme
based on bandpass sampling, although digital optical link is used for signal delivery, the performance is limited by
signal clipping and ADC resolution. The sampled RoF transport scheme requires only a narrow optical bandwidth, but the
performance is limited by IMD and noise processes introduced by bandpass sampling. Based on our analysis and
experimental results, a design guide of fibre-wireless integration system for broadband RF-OFDM transmission is
provided. It is found that: analog RoF is best suitable for short-range transmission; digitized RoF has the best
performance; and sampled RoF offers a low-cost solution.
© 2013 IEEE
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