High-speed 0.22 THz communication system with 84 Gbps for real-time uncompressed 8K video transmission of live events

Abstract

erahertz frequency band (0.1 ~ 10 THz) can provide ultra-high transmitting rates for massive emerging applications. However, due to the radio frequency impairments and limited signal processing property of baseband devices, it is difficult for the current terahertz communication systems to be used in real applications. In this work, we report a 0.22 THz communication system, which can provide 84 Gbps air interface rate over 1.26 kilometers distance. Such a system is underpinned by three breakthroughs, namely, integrating the reported terahertz wireless communication system, redesigning the signal processing in baseband devices, and increasing the cut-off frequency and transmitting power of radio frequency component by parameter optimizing. Being applied to realize the real-time transmission of the uncompressed 8K ultra high-definition video in the 31st International University Sports Federation in Chengdu, China, this work is a leaping advancement to enable terahertz systems from experiment to promising applications.

Introduction

Although millimeter wave (mmWave) (20 GHz–100 GHz) communications have been adopted to provide tens of gigabit per second (Gbps) transmitting rate in 5th generation mobile communication technology (5G)1,2, there will be a huge gap to meet the rapid growth of the transmitting data in the future by 2030 and beyond, where the required transmitting rate would be hundreds of Gbps or even terabit per second (Tbps). By providing such high transmitting rate, terahertz (THz) communication systems operating between 100 GHz and 10 THz are promising to satisfy the explosive growth requiring transmitting ultra-fast for the emerging 6G and beyond applications, e.g., remote education (tens of Gbps), teleoperation (hundreds of Gbps), high-quality video conference (tens of Gbps), augmented reality (AR)/ virtual reality (VR) (hundreds of Gbps to tera bps), etc3,4. For instance, to achieve medical teleoperation assisted by AR/VR, the wireless transmission should be extremely reliable to guarantee the environment recovery without any error in AR/VR. In such teleoperation scenarios, the 8K ultra high-definition (UHD) live video should be transmitted in real-time successfully for ultra-high resolution of the teleoperation5.

Another typical application is the broadcasting of sports events6 as shown in Fig. 1. This figure is a conceptual diagram of uncompressed UHD video transmission in sports event broadcasting based on THz wireless communication system in the future. The 8K UHD live video should be transmitted without compressing to guarantee the real-time requirement for the customers’ immersive experience. Since the 8K UHD video is uncompressed, the content should be error-free at the receiver (Rx) for high-resolution environment reconstruction in VR/AR or display on the screen of the TV in live sports broadcast. By providing such high air interface rates, more redundancy can be transmitted via forward error correction (FEC) coding/decoding to guarantee both high signal rate and low error probability after decoding at the Rx. On the other hand, the narrow beamwidth of THz leads to a high received power at the Rx to enhance the reliability3. Thus, such applications can be fully supported by THz communication systems since they can provide hundreds of Gbps or even Tbps transmitting rate with high reliability7.

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