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While promising in many aspects, one critical issue is the limited sensing range because weak reflection signals are used for sensing. Recently, LoRa signals are exploited for wireless sensing, moving a big step towards long-range sensing. Although promising, there is still a huge room for improvement. In this work, we qualitatively characterize the relationship between target movements and target-induced signal variations, and propose signal processing methods to enlarge the induced signal variation to achieve a longer sensing range. Experiment results show that the proposed system (1) pushes the contact-free sensing range of human walking from the state-of-the-art 50 m to 120 m; (2) achieves a sensing range of 75 m for fine-grained respiration sensing; and (3) demonstrates human respiration sensing even through seven concrete walls.<\/jats:p>","DOI":"10.1145\/3478080","type":"journal-article","created":{"date-parts":[[2021,9,14]],"date-time":"2021-09-14T22:48:23Z","timestamp":1631659703000},"page":"1-21","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":36,"title":["Pushing the Limits of Long Range Wireless Sensing with LoRa"],"prefix":"10.1145","volume":"5","author":[{"given":"Binbin","family":"Xie","sequence":"first","affiliation":[{"name":"College of Information and Computer Sciences, University of Massachusetts Amherst, USA"}]},{"given":"Yuqing","family":"Yin","sequence":"additional","affiliation":[{"name":"College of Information and Computer Sciences, University of Massachusetts Amherst, USA, School of Computer Science and Technology, China University of Mining and Technology, China"}]},{"given":"Jie","family":"Xiong","sequence":"additional","affiliation":[{"name":"College of Information and Computer Sciences, University of Massachusetts Amherst, USA"}]}],"member":"320","published-online":{"date-parts":[[2021,9,14]]},"reference":[{"key":"e_1_2_1_1_1","unstructured":"Hexoskin smart garments. https:\/\/www.hexoskin.com\/.  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