An interference robust multi-carrier wake-up radio

Wake-up radio technology is a means to improve energy efficiency in low-power wireless sensor networks. In such radios, low-power low-complexity designs are considered, often based on narrow-band transmission, simple modulation techniques, noncoherent detection and matched filter receivers. In order to improve the performance of wake-up radios in interference limited scenarios, while keeping the power consumption low at the wake-up receiver, a low-complexity multi-channel wake-up radio is proposed in this work. We propose a system in which the wake-up packet is spread across a time-frequency grid, using multi-channel on-off keying (OOK) transmission. At the receiver end, a multi-channel OOK detector and address correlator are employed. A channel selection mechanism is used, prior to the correlation operation, to further improve the detection performance as well as to limit the complexity and power consumption at the receiver. Our results show considerable performance gains over the single channel approach in terms of probability of detection, as well as over other multi-channel techniques.