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To evaluate the effect on performance under ipCSI condition in NOMA-MEC system, this study derives new exact and asymptotic expressions of the offloading outage probability for two users under ipCSI and perfect channel state information (pCSI) conditions. On the basis of the theoretical derivation, the diversity orders of the <jats:italic>n<\/jats:italic>th user under ipCSI and pCSI conditions are <jats:italic>zero<\/jats:italic> and <jats:italic>n<\/jats:italic>, respectively, while those for the distant user are all <jats:italic>zeros<\/jats:italic>. In addition, we also investigate the system throughput and energy efficiency of NOMA-MEC in delay-limited transmission. Numerical results show that (1) the offloading outage behaviors of NOMA-MEC are better than those of time division multiple address (TDMA), (2) the offloading outage performance of paired users under ipCSI is worse than that under pCSI, and (3) the NOMA-MEC system achieves higher throughput and energy efficiency than does the TDMA-MEC system.<\/jats:p>","DOI":"10.1186\/s13638-020-01750-0","type":"journal-article","created":{"date-parts":[[2020,7,1]],"date-time":"2020-07-01T07:53:42Z","timestamp":1593590022000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Performance analysis of NOMA-based mobile edge computing with imperfect CSI"],"prefix":"10.1186","volume":"2020","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6583-8707","authenticated-orcid":false,"given":"Huan","family":"Jiang","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yafei","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xinwei","family":"Yue","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xuehua","family":"Li","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2020,7,1]]},"reference":[{"key":"1750_CR1","doi-asserted-by":"crossref","unstructured":"C. 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