期刊
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
卷 69, 期 12, 页码 14945-14959出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TVT.2020.3031367
关键词
NOMA; Silicon carbide; Downlink; Uplink; Power system reliability; Probability; Resource management; NOMA; imperfect SIC; CDF-based scheduling; outage probability; fairness
资金
- National Nature Science Foundation of China [61502067]
- Key Research Project of Chongqing Education Commission [KJZD-K201800603]
- Key Project of Science and Technology Research of Chongqing Education Commission [KJZD-M201900602]
- Chongqing Nature Science Foundation [CSTC2018jcyjAX0432, CSTC2016jcyjA0455]
- Project of Anhui Education Department [AQKJ2015B008]
- Doctoral Candidate Innovative Talent Project of Chongqing University of Posts and Telecommunications [BYJS2017003, BYJS201912]
- NSERC
- Concordia University PERFORM Research Chair Program
The scheduling strategy is a vital precondition for achieving remarkable performance benefits offered by non-orthogonal multiple-access (NOMA) schemes. In this article, the cumulative distribution function (CDF)-based scheduling for NOMA (CS-NOMA) networks with randomly deployed users is investigated. We consider two practical successive interference cancellation (SIC) restrictions, namely imperfect SIC and SIC power difference constraint, in both downlink and uplink transmissions. Exact analytical expressions for the outage probabilities of the two scheduled users are derived in both fixed power allocation (FPA) and cognitive-radio-inspired power allocation (CPA) scenarios. To get more insights, high signal to noise ratio (SNR) approximations or bounds of the outage probabilities are derived, and then be utilized to analyze the achieved diversity orders. Assuming the number of near and far users are respectively represented as K and B. Results reveal that, in downlink transmission, the far user can achieve a diversity order of B in both FPA and CPA policies, while the near user's diversity order will be reduced from K (in FPA) to min {K, B} (in CPA). However, in uplink transmission, the achieved diversity orders of the near and far users will be increased from zeros to K and min {K, B}, respectively. Simulation results are provided to validate the accuracy of the analytical expressions.
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