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Using an underlay spectrum\u2010sharing method, secondary source and secondary relays must adjust their transmit power to guarantee quality of service of the primary network. Under the limited transmit power, cochannel interference from the primary transmitters, and hardware noises caused by impairments, we propose best\u2010path selection methods to improve the end\u2010to\u2010end performance for the secondary network. Moreover, both multihop decode\u2010and\u2010forward and amplify\u2010and\u2010forward relaying protocols are considered in this paper. We derive expressions of outage probability for the primary and secondary networks and propose an efficient method to calculate the transmit power of the secondary transmitters. Then, computer simulations employing the Monte\u2010Carlo approach are realized to validate the derivations.<\/jats:p>","DOI":"10.1155\/2021\/8861725","type":"journal-article","created":{"date-parts":[[2021,4,13]],"date-time":"2021-04-13T18:20:57Z","timestamp":1618338057000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Performance Enhancement for Multihop Cognitive DF and AF Relaying Protocols under Joint Impact of Interference and Hardware Noises: NOMA for Primary Network and Best\u2010Path Selection for Secondary Network"],"prefix":"10.1155","volume":"2021","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3947-2174","authenticated-orcid":false,"given":"Tran Trung","family":"Duy","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7722-0832","authenticated-orcid":false,"given":"Pham Thi Dan","family":"Ngoc","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1448-8882","authenticated-orcid":false,"given":"Phuong T.","family":"Tran","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2021,4,13]]},"reference":[{"key":"e_1_2_9_1_2","doi-asserted-by":"publisher","DOI":"10.1109\/LCOMM.2003.812178"},{"key":"e_1_2_9_2_2","doi-asserted-by":"crossref","unstructured":"FarhadiG.andBeaulieuN. 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