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Power allocation schemes for wireless powered NOMA systems with imperfect CSI: An application in multiple antenna–based relay
Author(s) -
Nguyen ThanhLuan,
Do DinhThuan
Publication year - 2018
Publication title -
international journal of communication systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.344
H-Index - 49
eISSN - 1099-1131
pISSN - 1074-5351
DOI - 10.1002/dac.3789
Subject(s) - computer science , relay , wireless , channel state information , noma , resource allocation , transmission (telecommunications) , monte carlo method , wireless power transfer , mathematical optimization , transmitter power output , power (physics) , channel (broadcasting) , wireless network , computer network , telecommunications , telecommunications link , transmitter , mathematics , physics , statistics , quantum mechanics
Summary The simultaneous wireless information and power transfer or energy harvesting (EH) can be combined in nonorthogonal multiple access (NOMA) as green applications towards 5G. This paper investigates a new cooperative EH‐NOMA protocol, where the intermediate relay has not equipped the fixed power source and acts as a wireless powered relay to help signal transmission to representative weak user and strong user in NOMA. However, impacts of imperfect channel estimation contribute to outage system performance evaluations. We formulate the power resource assignment paradigms as two schemes, namely, fixed power allocation and dynamic power allocation, by considering imperfect channel state information (CSI). To solve this problem, we derive the closed‐form expressions of outage probability under imperfect CSI and the power allocation constraints. The expected numerical results related to the derived expressions for the outage probability are examined that numerical and the Monte Carlo simulations are strictly matching lines.