Physical Layer Reliability Research Articles

Comparison between Different Channel Coding Techniques for IEEE 802.11be within Factory Automation Scenarios.

This paper presents improvements in the physical layer reliability of the IEEE 802.11be standard. Most wireless system proposals do not fulfill the stringent requirements of Factory Automation use cases. The harsh propagation features of industrial environments usually require time retransmission techniques to guarantee link reliability. At the same time, retransmissions compromise latency. IEEE 802.11be, the upcoming WLAN standard, is being considered for Factory Automation (FA) communications. 802.11be addresses specifically latency and reliability difficulties, typical in the previous 802.11 standards. This paper evaluates different channel coding techniques potentially applicable in IEEE 802.11be. The methods suggested here are the following: WLAN LDPC, WLAN Convolutional Codes (CC), New Radio (NR) Polar, and Long Term Evolution (LTE)-based Turbo Codes. The tests consider an IEEE 802.11be prototype under the Additive White Gaussian Noise (AWGN) channel and industrial channel models. The results suggest that the best performing codes in factory automation cases are the WLAN LDPCs and New Radio Polar Codes.

Integrated 5G-Satellite Networks: A Perspective on Physical Layer Reliability and Security

Fifth generation (5G) mobile systems are expected to be integrated with different radio access methods such as satellite components to provide seamless connectivity and ubiquitous coverage for users worldwide. In this article, we first provide a brief review of current initiatives and system architecture for the convergence of satellite and 5G networks. Then, we investigate various approaches to improve reliability or security at the physical layer for the integrated 5G-satellite networks. An effective achievable rate is presented as the key performance indicator to measure the security and reliability trade-off, followed by the implementation of a proposed beamforming scheme. Finally, we present future trends and challenges in integrated 5G-satellite networks.

Real-Time Optical Wireless Mobile Communication With High Physical Layer Reliability

As the use of optical wireless communication (OWC) in industrial production environments is gaining interest, it is necessary to consider the application's challenging requirements with respect to reliability and low latency. In this paper, we first analyze the factors limiting coverage and reliability in OWC. We discuss increased drive signal powers with an optional nonlinear post-equalizer, which improves the signal-to-noise ratio by an additional 3.5 dB. Further, spanning a multiple-input multiple-output (MIMO) channel and exploiting antenna diversity is shown to significantly increase the reliability of the OWC physical layer. The insights obtained from a series of experiments lead to a real-time demonstration of OWC with intrinsically high coverage and reliability. These first real-time results of OWC in an industrial production environment are discussed and physical layer data rates of up to 150 Mb/s with an average latency of <;1 ms are shown.