Fiber link design considerations for cloud-Radio Access Networks

Abstract

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Experimental demonstration of digital predistortion for orthogonal frequency‐division multiplexing‐radio over fibre links near laser resonance

“…The work reported here represents a more complete demonstration of the memory polynomial predistortion approach to OFDM-RoF links compared with our previous works [5,6,13]. The novelty of the current work is summarised as follows: (1) the predistortion scheme is now tested significantly closer to (and around) the laser resonance frequencyit is well known that laser dynamic non-linearity peaks at resonance; (2) the first demonstration of the predistortion scheme for directly modulated RoF links using a 2048 IFFT size OFDM signal and 256 QAM modulation is achieved; (3) a high-power-level predistortion training approach is proposed and demonstrated; (4) the resilience of the predistortion approach to changes in modulation level of QAM schemes, and changes in average power levels are also studied.…”

“…Moreover, the predistortion was tested for cases of only one [5] and two [6] average power levels. Error vector magnitude (EVM) results for the digital predistortion scheme applied to a 2.47‐GHz OFDM‐RoF link were recently reported [13]. However, those results were obtained from only one power level case and using only a QAM modulation level of 64.…”