Abstract
Radio-over-fiber (RoF) is traditionally based on analog modulation and detection. Owing to the availability of high-speed digital-to-analog converters and analog-to-digital converters in recent years, digital signal processing (DSP)-assisted RoF techniques have been introduced to improve both the bandwidth efficiency and the signal fidelity for RoF transmission. In this chapter, we first provide an overview of RoF techniques for mobile front-haul such as analog RoF (A-RoF), digital RoF (D-RoF), and hybrid digital-analog radio-over-fiber (DA-RoF) in the first section. We then describe in more depth A-RoF based on DSP-assisted frequency-division multiplexing and time-division multiplexing (TDM) in the second section and the third section, respectively. The fourth section provides a theoretical performance comparison between A-RoF and D-RoF. The fifth section presents Common Public Radio Interface–compatible TDM-based DA-RoF. Finally, concluding remarks are provided in the last section.
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