{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,28]],"date-time":"2025-10-28T05:56:45Z","timestamp":1761631005351,"version":"build-2065373602"},"reference-count":27,"publisher":"MDPI AG","issue":"19","license":[{"start":{"date-parts":[[2022,9,20]],"date-time":"2022-09-20T00:00:00Z","timestamp":1663632000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Car2TERA project of the European Union\u2019s Horizon 2020 research and innovation programme","award":["824962","957403","101017011","61620106001"],"award-info":[{"award-number":["824962","957403","101017011","61620106001"]}]},{"name":"European Union\u2019s Horizon 2020 project Int5Gent","award":["824962","957403","101017011","61620106001"],"award-info":[{"award-number":["824962","957403","101017011","61620106001"]}]},{"name":"European Union\u2019s Horizon 2020 project RISE6G","award":["824962","957403","101017011","61620106001"],"award-info":[{"award-number":["824962","957403","101017011","61620106001"]}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["824962","957403","101017011","61620106001"],"award-info":[{"award-number":["824962","957403","101017011","61620106001"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Chalmers Transport Area of Advance","award":["824962","957403","101017011","61620106001"],"award-info":[{"award-number":["824962","957403","101017011","61620106001"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>A multi-channel backscatter communication and radar sensing system is proposed and demonstrated in this paper. Frequency modulated continuous wave (FMCW) radar ranging is integrated with simultaneous uplink data transmission from a self-packaged active radio frequency (RF) tag. A novel package solution is proposed for the RF tag. With the proposed package, the RF tag can transmit a 32-QAM signal up to 2.5 Gbps and QPSK signal up to 8 Gbps. For a multi-tag scenario, we proposed using spread spectrum code to separate the data from each tag. In this case, tags can be placed at arbitrary locations without adjacent channel interference. Proof-of-concept simulations and measurements are demonstrated. A 625 Mbps data rate is achieved in a dual-tag scenario for two tags.<\/jats:p>","DOI":"10.3390\/s22197104","type":"journal-article","created":{"date-parts":[[2022,9,21]],"date-time":"2022-09-21T00:08:09Z","timestamp":1663718889000},"page":"7104","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Millimeter-Wave Multi-Channel Backscatter Communication and Ranging with an FMCW Radar"],"prefix":"10.3390","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1775-2623","authenticated-orcid":false,"given":"Sining","family":"An","sequence":"first","affiliation":[{"name":"Microwave Electronics Laboratory, Department of Microtechnology and Nanoscience, Chalmers University of Technology, SE-41296 Gothenburg, Sweden"}]},{"given":"Xiangyuan","family":"Bu","sequence":"additional","affiliation":[{"name":"School of Information Science and Electronics, Beijing Institute of Technology, Beijing 100081, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1298-6159","authenticated-orcid":false,"given":"Henk","family":"Wymeersch","sequence":"additional","affiliation":[{"name":"Department of Electrical Engineering, Chalmers University of Technology, SE-41296 Gothenburg, Sweden"}]},{"given":"Herbert","family":"Zirath","sequence":"additional","affiliation":[{"name":"Microwave Electronics Laboratory, Department of Microtechnology and Nanoscience, Chalmers University of Technology, SE-41296 Gothenburg, Sweden"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0487-1527","authenticated-orcid":false,"given":"Zhongxia Simon","family":"He","sequence":"additional","affiliation":[{"name":"Microwave Electronics Laboratory, Department of Microtechnology and Nanoscience, Chalmers University of Technology, SE-41296 Gothenburg, Sweden"},{"name":"SinoWave AB, SE-43650 Hov\u00e5s, Sweden"}]}],"member":"1968","published-online":{"date-parts":[[2022,9,20]]},"reference":[{"key":"ref_1","unstructured":"Rao, K.V.S. 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