Spectral efficiency analysis of ngpon based heterogeneous fi wi access networks

Abstract

Recent mobile broadband networks require heterogeneous networks supporting high capacity on demand. The next-generation broadband access networks need a very high capacity to satisfy growing users demand and mobility to support mobile users. The ever-increasing demand for higher network capacity requires an enhanced version of the access network. Optical networks offer higher bandwidth, whereas wireless networks support seamless mobility. A hybrid Fiber-Wireless (Fi-Wi) access network combining these advantages can satisfy the demands of future access networks. The prime motivation of this work is to develop a flexible, high-speed, low-cost heterogeneous network by integrating fiber and wireless networks, thereby achieving the requirements of the broadband access network such as higher bandwidth and seamless mobility. The integration approach plays a crucial role in the seamless convergence of optical and wireless networks, and it should also enhance scalability, Quality of Service (QoS), reliability, and energy efficiency. Radio over Fiber (RoF) technology is used as the integration approach to meet the requirements of broadband mobile communication. The performance of the proposed heterogeneous network is analyzed in terms of Bit Error Rate (BER), Error Vector Magnitude (EVM), Capacity, and Spectral efficiency. The simulation tools used for the performance analysis are MATLAB R 2018a, VPI Transmission Maker 9.7, and VPI Photonics Analyzer. The minimum optical power required for efficient transmission over the link is estimated by Link Power analysis. Differential modulation techniques are considered for the study of modulation techniques to be employed in future access networks. Differential Amplitude Phase Shift Keying (DAPSK) is a differential modulation technique that combines the features of Differential Phase Shift Keying (DPSK) and Quadrature Amplitude Modulation (QAM).