Experimental evaluation of real-time sigma-delta radio over fiber system for fronthaul applications

Sigma-delta radio over fiber (sigma Delta-RoF) is an expedient technology for next-generation networks including 5G cloud/centralized radio access networks (C-RAN). In this article, we demonstrate a realistic experimental scenario for sigma Delta-RoF link targeting C-RAN fronthaul applications, by using baseband second-order 1-bit sigma-delta modulation (sigma Delta-M). The experimental set-up validates the LTE 20 MHz signals having modulation order of 256-quadrature amplitude modulation for a carrier frequency of 3 GHz, up to 10 km of standard single mode fiber. A detailed analysis of the sigma Delta-RoF system performance is reported by adjacent channel leakage ratio and error vector magnitude. Furthermore, an experimental study is evaluated where sigma Delta-RoF is compared with its counterparts. It is deduced that sigma Delta-RoF corroborates the present range of C-RAN fronthaul networks and can be a promising candidate for future mobile haul applications.

Automated summary

Sigma-delta radio over fiber (Sigma Delta-RoF) is demonstrated as a practical technology for next-generation networks, particularly for C-RAN fronthaul applications in this article. The experimental setup confirms the successful transmission of LTE signals and compares the performance with other technologies.