Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: High sensitivity wake-up radio using spreading codes: design, evaluation, and applications | Shih et al. EURASIP Journal on Wireless Communications and Networking 2011 2011 26 http content 2011 1 26 o EURASIP Journal on Wireless Communications and Networking a SpringerOpen Journal RESEARCH Open Access High sensitivity wake-up radio using spreading codes design evaluation and applications Wen-Chan Shih1 Raja Jurdak2 Bih-Hwang Lee1 and David Abbott3 Abstract Most of the published wake-up radios propose low energy design at the expense of reduced radio range which means that they require an increased deployment density of sensor networks. In this article we introduce a design of a high sensitivity MHz wake-up radio using low data rate and forward error correction FEC . It improves the sensitivity up to -122 dBm at a data rate 370 bit s. It achieves up to 13 dB of coding gain with symbol error rate SER 10-2 and up to 4 times the range of the data radio rendering it more suitable to sensor networks. Our design can receive wake-up signal reliably from any IEEE transmitter and achieves a low packet error rate PER at SNR 4 dB. Furthermore our design encodes the node ID into a wake-up signal to avoid waking up the undesired nodes. Keywords Wake-up radio Wireless sensor network applications Forward error correction FEC Introduction The sensor node has constrained energy resources and the radio accounts for a major portion of the node s energy budget 1 2 . Current research into energy efficiency in sensor networks puts the radio in sleep mode when there is no traffic to reduce energy consumption. These works can be classified into two main categories 1 MAC protocols 2-6 and 2 wake-up radios 6-14 . Current MAC protocols do not eliminate idle listening. Event-driven wake-up radios provide an opportunity to solve idle listening. Previously published wake-up radios are low power with low sensitivity 6-14 . They provide extremely low energy consumption at the cost of shorter read range than the data radio 15 . They .
