TY - JOUR

T1 - Capacity and Flexibility Improvement for Fixed 5G: Key Enabling Technologies, Trends and Challenges

AU - Zhang, Jing

AU - Zhong, Zhuqiang

AU - Jin, Xianqing

AU - Yu, Yi

AU - Tang, Jianming

AU - Li, Liangchuan

AU - Qiu, Kun

PY - 2022/12/12

Y1 - 2022/12/12

N2 - As the emergence of various high-bandwidth services and the requirementsto support 5G/Wi-Fi 6 wireless networks, the next generation fixed networks, i.e. F5G, are expected to be realized in the 5G era. F5G is endowed with new characteristics, including ultra-high bandwidth, all-optical connections and optimal service experience. In terms of signal transmission, intensity modulation direct-detection (IM-DD) is favorable due to its simple architecture. The fundamental challenge associated with direct-detection is the disappearance of the transmitted signal’s phase. Along with the IMDD’s nonlinear effects, limited bandwidth and power fading degrade the system transmission performance. Advanced modulation and coherent detection are also attractive to support large capacity access, however, the complexity and low power consumption need to be solved properly. In terms of access, the flexibility and low latency are the two key factors affecting service experience. In this article, we review the evolution of PONs and the challenges of current PONsin detail. We analyze key enabling digital signal processing (DSP)techniques, including detection linearization for direct-detection and coherent detection, adaptive equalizers, digital filer enabled flexible access and low-latency inter-OUN communications. Finally, we discuss the developing trends of future fixed access networks.

AB - As the emergence of various high-bandwidth services and the requirementsto support 5G/Wi-Fi 6 wireless networks, the next generation fixed networks, i.e. F5G, are expected to be realized in the 5G era. F5G is endowed with new characteristics, including ultra-high bandwidth, all-optical connections and optimal service experience. In terms of signal transmission, intensity modulation direct-detection (IM-DD) is favorable due to its simple architecture. The fundamental challenge associated with direct-detection is the disappearance of the transmitted signal’s phase. Along with the IMDD’s nonlinear effects, limited bandwidth and power fading degrade the system transmission performance. Advanced modulation and coherent detection are also attractive to support large capacity access, however, the complexity and low power consumption need to be solved properly. In terms of access, the flexibility and low latency are the two key factors affecting service experience. In this article, we review the evolution of PONs and the challenges of current PONsin detail. We analyze key enabling digital signal processing (DSP)techniques, including detection linearization for direct-detection and coherent detection, adaptive equalizers, digital filer enabled flexible access and low-latency inter-OUN communications. Finally, we discuss the developing trends of future fixed access networks.

U2 - 10.23919/JCC.2022.12.001

DO - 10.23919/JCC.2022.12.001

M3 - Article

VL - 19

JO - China Communications

JF - China Communications

SN - 1673-5447

IS - 2

ER -