In a groundbreaking development, researchers at the Fraunhofer Institute for Integrated Circuits in Ilmenau have demonstrated the potential of millimeter-wave (mmWave) orthogonal frequency-division multiplexing (OFDM) joint communication and sensing (JCAS) systems for monitoring human vital signs. This innovative approach promises to revolutionize applications in healthcare, sports, safety, security, and military sectors by providing a non-invasive, wireless method for detecting heart and breathing rates.
The study, conducted by Jakub Dobosz, Maximilian Engelhardt, Diego Dupleich, Maciej Stapor, and Pawel Kulakowski, explored the effectiveness of an indoor OFDM JCAS system operating at a frequency of 26.5 GHz with a bandwidth of up to 1 GHz. The system was tested in a bistatic configuration, meaning the transmitter and receiver were positioned at different locations, to simulate real-world conditions more accurately.
The researchers conducted measurements under various scenarios, including subjects lying down, sitting, walking, and even in non-line-of-sight conditions. The results showed that vital sign detection is generally feasible, but its effectiveness is influenced by several factors. These include the subjects’ clothing, their level of activity, and the distance and angle relative to the sensing system. Interestingly, the study found that the bandwidth did not significantly impact the detection of vital signs, as the relevant information is encoded in the phase of the signal rather than its amplitude.
One of the key advantages of this technology is its ability to monitor vital signs without physical contact, which can be particularly beneficial in medical settings where continuous monitoring is required but minimizing patient disturbance is crucial. In sports, this technology could help coaches and trainers monitor athletes’ physiological responses in real-time, enabling them to optimize performance and reduce the risk of injury. For safety and security applications, the ability to detect vital signs from a distance could be invaluable in search and rescue operations, as well as in monitoring individuals in high-risk environments.
In the military sector, the implications are equally significant. Soldiers equipped with this technology could have their vital signs monitored remotely, providing critical data to medical personnel and commanders. This could enhance situational awareness and enable quicker responses to medical emergencies on the battlefield. Furthermore, the non-invasive nature of the system could reduce the burden on soldiers, allowing them to focus more on their mission.
The findings from this research highlight the potential of mmWave OFDM JCAS systems to transform various industries by providing a reliable, non-invasive method for monitoring vital signs. As the technology continues to evolve, it is expected to become even more accurate and versatile, opening up new possibilities for its application in both civilian and military contexts. The work conducted by the Fraunhofer Institute researchers represents a significant step forward in the development of this cutting-edge technology, paving the way for a future where vital sign monitoring is seamless, efficient, and widely accessible. Read the original research paper here.