Exploiting molecular absorption in the THz band for low latency wearable wireless device communications

Wearable wireless devices (WWDs) have been emerging as an important tool for future communication and control systems. When multiple uncoordinated WWD bearers exist in close proximity, the issue of interference between cochannel transmissions presents a major challenge. In this work, we exploit the molecular absorption (MA) regions of the Terahertz band (0.1-10 THz) for deploying WWDs efficiently. While such regions are not suitable for relatively long-range transmission schemes, the fast exponential decay of signal power with distance due to MA proves to be beneficial for WWD systems in limiting the cochannel interference. Our results for a symbol rate of 1 Gsymbols/s show that 95% of the users achieve a signal-to-interference-plus-noise ratio greater than 3 dB for a typical application, even in high-density user scenarios.