Abstract
Wireless broadband access networks have been positioning themselves as a good solution for manufacturers and users of IoT (internet of things) devices, due mainly to the high data transfer rate required over terminal devices without restriction of information format. In this work, a review of two Radio over Fiber strategies is presented. Both have excellent performance and even offer the possibility to extend wireless area coverage where mobile networks do not reach, or the 802.11 network presents issues. Radio Frequency over Fiber (RFoF) and intermediate Frequency over Fiber (IFoF) are two transmission strategies compatible with the required new broadband services and both play a key role in the design of the next generation integrated optical–wireless networks, such as 5G and Satcom networks, including on RAU (Remote Antenna Unit) new functionalities to improve their physical dimensions, employing a microelectronic layout over nanometric technologies.
Highlights
In new wireless access networks, there is an option to avoid the attenuation issue through distributed antenna systems (DAS) implementation
On the other hand, reduced antenna size brings up the possibility that future base stations will be able to operate using massive multiple input–multiple output (MIMO) configurations to strongly increase the maximum data capacity, if individual channels are multiplexed over the same communications infrastructure
In the last years, mixed fiber–wireless communication DAS fed by multi-mode fibers (MMF) are gaining space as the most promising solution to achieve efficient, cost-effective, and highcapacity transmissions in short range communications. (Lim et al 2019)
Summary
In new wireless access networks, there is an option to avoid the attenuation issue through distributed antenna systems (DAS) implementation. These cells, operating at millimeter waves, will need antennas of reduced size compared to current ones, which will simplify their deployment. A new telecommunications scenario is still being set, with fewer doubts that over most commonly used standards for IoT implementation (WiFi, Bluetooth, ZigBee, Thread, SigFox, NFC, etc.), the WiFi standard is the preferred option and has a greater development potential. There are many predictions that coincide in pointing out that the role played by theWiFi standard in IoT systems, relevant already, will become more important with time and will establish as the dominant option in the midterm.(Lopez-Perez et al 2019)
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