Terahertz Technologies to Deliver Optical Network Quality of Experience in Wireless Systems Beyond 5G (1803.09060v1)

Abstract: This article discusses the basic system architecture for terahertz (THz) wireless links with bandwidths of more than 50 GHz into optical networks. New design principles and breakthrough technologies are required in order to demonstrate Tbps data-rates at near zero-latency using the proposed system concept. Specifically, we present the concept of designing the baseband signal processing for both the optical and wireless link and using an end-to-end (E2E) error correction approach for the combined link. We provide two possible electro-optical baseband interface architectures, namely transparent optical-link and digital-link architectures, which are currently under investigation. THz wireless link requirements are given as well as the main principles and research directions for the development of a new generation of transceiver frontends, which will be capable of operating at ultra-high spectral efficiency by employing higher-order modulation schemes. Moreover, we discuss the need for developing a novel THz network information theory framework, which will take into account the channel characteristics and the nature of interference in the THz band. Finally, we highlight the role of pencil-beamforming (PBF), which is required in order to overcome the propagation losses, as well as the physical layer and medium access control challenges.

• The paper explores using terahertz technologies in beyond 5G wireless systems to achieve Tbps data rates and optical network Quality of Experience through integrated THz and optical networks.
• Through modeling, the authors estimate up to 600-800 Gbps data rates with THz, but highlight significant challenges like propagation losses above 370 GHz.
• Practical implications include adaptive co-design and pencil-beamforming to manage challenges, requiring new theoretical models and sophisticated system design.

Terahertz Technologies to Deliver Optical Network Quality of Experience in Wireless Systems Beyond 5G

The paper "Terahertz Technologies to Deliver Optical Network Quality of Experience in Wireless Systems Beyond 5G" provides a comprehensive exploration of emerging technologies poised to meet the ever-increasing demands for high data-rate wireless communications. In the field beyond 5G, the authors propose innovative terahertz (THz) wireless technologies that promise to deliver optical network Quality of Experience (QoE) through seamless integration of THz and optical networks.

Key Propositions

The primary focus of the research is on advancing THz communication systems to achieve Tbps data rates with almost zero-latency, heralding substantial improvements over current systems. The paper discusses two primary baseband interface architectures—transparent and digital optical-link architectures—highlighting their roles in photonic radios. The transparent optical-link architecture focuses on achieving seamless integration without additional baseband digital signal processing (DSP), whereas the digital optical-link architecture relies on Ethernet-compliant interfaces for higher complexity applications.

Numerical Results and Potential Challenges

Through theoretical modeling and practical considerations, the authors estimate that using the THz band can support data transmission at up to 600 Gbps over a kilometer using single-channel frontend architectures and highly directive antennas. This is starkly contrasted with the anticipated developments, which propose the potential to reach data rates of up to 800 Gbps by leveraging higher order modulations and utilizing both antenna polarizations.

However, the paper underscores significant challenges, especially in managing the wireless link budget, where propagation losses due to atmospheric absorption can be substantial, particularly as transmission frequencies surpass 370 GHz. This necessitates advanced RF frontend architectures and novel DSP techniques to ensure optimal signal integrity and system performance.

Theoretical and Practical Implications

From a theoretical perspective, this work contributes to the foundation for new exploration in THz network information theory, taking into account unique channel characteristics and the nature of interference in the THz band. Practically, the paper advocates for an adaptive co-design approach across the physical and MAC layers, which will be critical for managing the physical limitations and promoting efficient resource management.

An important enabler identified is pencil-beamforming (PBF), essential for overcoming propagation losses through narrow, steerable beams. Nevertheless, the deployment of PBF systems invites challenges in space and frequency synchronization, necessitating precise state information for efficient antenna array adaptation.

Future Directions

The paper concludes with a call to adapt existing technologies and develop novel theoretical models that align with experimental findings to facilitate the realization of THz technologies in practical, scalable network applications. Future research will likely explore the development of joint optical and wireless channel modeling, advanced equalization, and coding schemes to maximize spectral efficiency and mitigate hardware limitations.

Conclusion

Overall, the research outlines a compelling vision of leveraging THz technologies beyond 5G to bridge existing gaps in wireless communications, addressing critical technical challenges and proposing strategies for future advancements. It opens avenues for sophisticated system design and engineering to revolutionize stationary and mobile data transmission, aligning with anticipated exponential growth in data-centric applications. This framework sets the stage for the transformative integration of THz technologies towards achieving ubiquitous, high-performance wireless networking.