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Therefore, to eliminate the requirement for high\u2010precision LO, a simple yet effective digital IQ demodulation method has been proposed with the aid of a specified sampling scheme in order to eliminate the demand for LO. Based on the bandpass sampling theorem, the characteristic of the intermediate frequency signal of mmWave imaging indicates that the LO is unrequired if the sampling rate is twice of the frequency of the carrier of the intermediate signal. In this way, the in\u2010phase signal would be directly and accurately obtained by performing the Binary\u2010Phase\u2010Shift\u2010Keying (BPSK) modulation on the samples, based on which the IQ demodulation would be completed by using the Hilbert transform. The proposed method does not employ LO and thus simplifies the demodulation process and is suitable for implementation in a Field\u2010Programmable Gate Array (FPGA) with fewer hardware resources. To verify the method, a three\u2010dimensional mmWave radar imaging is carried out at the 30\u201034\u2009GHz bandwidth, where the sampling and digital IQ demodulation are realized by an ADC (AD9250) and FPGA (XC7K325T), respectively. The results show a simplified transceiver with lower requirements and the prospect of the proposed method being applied in radar imaging and other related fields.<\/jats:p>","DOI":"10.1155\/2021\/5596854","type":"journal-article","created":{"date-parts":[[2021,11,6]],"date-time":"2021-11-06T06:20:05Z","timestamp":1636179605000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["BPSK Modulation\u2010Based Local Oscillator\u2010Free IQ Demodulation for Millimeter Wave Imaging"],"prefix":"10.1155","volume":"2021","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6945-8293","authenticated-orcid":false,"given":"Qibin","family":"Zheng","sequence":"first","affiliation":[]},{"given":"Yanpeng","family":"Jian","sequence":"additional","affiliation":[]},{"given":"Lei","family":"Wang","sequence":"additional","affiliation":[]},{"given":"Ziyue","family":"Ma","sequence":"additional","affiliation":[]},{"given":"Xinyu","family":"Li","sequence":"additional","affiliation":[]},{"given":"Chaofan","family":"Song","sequence":"additional","affiliation":[]},{"given":"Ping","family":"Li","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7438-3057","authenticated-orcid":false,"given":"Li","family":"Ding","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2021,11,5]]},"reference":[{"key":"e_1_2_8_1_2","doi-asserted-by":"crossref","unstructured":"KempM. 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