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In this system, the base station (BS) serves a set of uplink fixed half-duplex (HD) terminals with non-linear energy harvester. Considering the non-linearity of practical energy-harvesting circuits, we adopt the realistic non-linear EH model rather than the idealistic linear EH model. The proposed SWIPT protocol can be divided into two phases. The first phase is designed for terminals EH and downlink training. A beam domain energy beamforming method is employed for the wireless power transmission. In the second phase, the BS forms the two-layer receive beamformers for the reception of signals transmitted by terminals. In order to improve the spectral efficiency (SE) of the system, the BS transmit power- and time-switching ratios are optimized. Simulation results show the superiority of the proposed beam-domain SWIPT protocol on SE performance compared with the conventional mMIMO SWIPT protocols.<\/jats:p>","DOI":"10.1186\/s13638-019-1378-4","type":"journal-article","created":{"date-parts":[[2019,9,11]],"date-time":"2019-09-11T11:03:07Z","timestamp":1568199787000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["SWIPT in mMIMO system with non-linear energy-harvesting terminals: protocol design and performance optimization"],"prefix":"10.1186","volume":"2019","author":[{"given":"Kui","family":"Xu","sequence":"first","affiliation":[]},{"given":"Ming","family":"Zhang","sequence":"additional","affiliation":[]},{"given":"Jie","family":"Liu","sequence":"additional","affiliation":[]},{"given":"Nan","family":"Sha","sequence":"additional","affiliation":[]},{"given":"Wei","family":"Xie","sequence":"additional","affiliation":[]},{"given":"Lihua","family":"Chen","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2019,9,9]]},"reference":[{"issue":"3","key":"1378_CR1","doi-asserted-by":"publisher","first-page":"2062","DOI":"10.1109\/COMST.2018.2817685","volume":"20","author":"F. 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