We have implemented a near-ultrasonic communication protocol in the 18.5-20 kHz band, which is inaudible to most humans, using commodity smartphone speakers and microphones to transmit and receive ...

Traditional orthogonal time-frequency space (OTFS) channel estimation schemes place guard symbols around pilots to avoid interference from data symbols, thereby reducing spectrum efficiency (SE). To ...

Using the wrong emoji at work can shift the meaning of your message. Staying curious about tone and generational preferences ...