Internet of Radars: Sensing versus Sending with Joint Radar-Communications

Abstract

The Internet of Things (IoT) are interconnected devices for exchanging information through sensors and actuators. One of the main physical sensors to understand the environment beyond the visible world is a radar. Basically, radars have always been a military tool to be used to investigate the environment. However, with the developing technology, radars have become more compact and affordable to use in a building, in a car, in a drone or even in a wristwatch. In the near future, radar-equipped IoT platforms will start to appear increasingly. For each IoT platform, dual use of spectrum with dual aperture is required for sensing and communicating when using conventional approaches. For the radar sensing IoT devices, the emission from the radar and communication circuitry is the main reason of the increase in energy consumption. Furthermore, an increasing number of radars emerges as congested spectrum, and RF convergence between radars and communication systems becomes more likely to present itself. Recent years, there have been numerous researches which propose using the one emission/waveform for perceiving the environment and sending information. They are often called as "Joint Radar-Communication (JRC)" systems. Due to the latest developments in JRC system designs, radar sensing IoT platforms now can be transformed into an "Internet of RAdio Detectors And Rangers (IoR)". In this article, we present a short survey on JRC technologies, possible application areas IoR applications and challenges and future research directions for enabling the concept of IoR.Ozgur B. Akan [M00, SM07, F16] received his Ph.D. degree in electrical and computer engineering from the Broadband and

Probabilistic Spectrum Sensing Based on Feature Detection for 6G Cognitive Radio: A Survey

“…4. As suggested in [131], CR-enabled coexistence and/or combination of radars and IoT/UAV devices can be applied in multiple everyday applications, home automation and security, drone-based environment sensing, as well as smart vehicles.…”

Cooperative Multiterminal Radar and Communication: A New Paradigm for 6G Mobile Networks

“…Radio detection, ranging and wireless communication are the most common radio functionalities used by both civilian and military applications. Traditionally, these systems have been designed and developed in isolation from each other [1]. Reflectometry-based sensing systems send a known waveform and assess the response of the environment.…”

“…The co-design approach breaks away from how spectral resources have traditionally been accessed, since the communication and radar systems are no longer treated as independent entities or as sources of interference [1] [2]. Instead, their common elements, such as antenna arrays, radio frequency (RF) front-end circuits and digital signal processing (DSP) blocks, are shared [4], leading to improvements in their cost, form-factor, spectral efficiency and power consumption [3].…”

“…The authors of [7] discuss several information embedding techniques, mapping the information to be conveyed to either the phase, the amplitude, the frequency, or their combinations. Furthermore, beampattern modulation techniques [1] [6], which modify the side-lobe levels (SLLs) in an opportunistic manner, provide another option to embed data into radar waveforms. Since these waveforms were optimized for the radar functionality, they achieve reliable sensing.…”

“…There has been significant interest in the combination of radar and communication functionalities within a common platform [1]- [4], and this need will increase with 6G, which aims for supporting the convergence of the digital, physical, and personal domains. This requires expanding the functionalities of 5G, to include the integration of radio sensing and communications in support of both hardware-and spectrumsharing.…”