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
The upcoming internet of things (IoT) technological frontier arouses enormous interest
Its deployment potential depends on the available wireless connectivity, and several attempts have been made to adapt new IoT applications to various existing wireless solutions, including more recent projections for new mobile networks developed to be employed in the Industry 5.0 era [1]
This versatility is currently driving the research to new versions within the family of WiFi standard in order to adapt it to IoT networks, while maintaining a common framework that allows interoperability and simplifies design cycles
Summary
The upcoming internet of things (IoT) technological frontier arouses enormous interest. There is a general consensus that due to the enormous amount of potential IoT applications (home automation, security, wearable, sensor networks, industrial automation, precision agriculture, remote surveillance, or the so-called Smart City), there is no single standard capable of satisfying the particular needs of each one, in terms of complexity and cost, power consumption and transmission speed [2,3] At the moment, it is still unclear which technologies will take over to meet the increased connectivity demand in the long run, allowing a huge bandwidth consumption of future 5G networks that are already being deployed [4]. At high frequencies attenuation increases, techniques such as beamforming, which consists of radiating with high directivity, are employed, and in this way the reachable distance for millimeter waves transmission is increased [7]
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