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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 한국인터넷방송통신학회 International journal of internet, broadcasting and communication : IJIBC International journal of internet, broadcasting and communication : IJIBC 제12권 제1호
- 발행연도
- 2020.1
- 수록면
- 67 - 72 (6page)
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초록· 키워드
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The fifth generation (5G) mobile communication has an impact on the human life over the whole world, nowadays, through the artificial intelligence (AI) and the internet of things (IoT). The low latency of the 5G new radio (NR) access is implemented by the state-of-the art technologies, such as non-orthogonal multiple access (NOMA). This paper investigates a practical issue that in NOMA, for the practical channel models, such as fading channel environments, the successive interference cancellation (SIC) should be performed on the stronger channel users with low power allocation. Only if the SIC is performed on the user with the stronger channel gain, NOMA performs better than orthogonal multiple access (OMA). Otherwise, NOMA performs worse than OMA. Such the superiority requirement can be easily implemented for the channel being static or slow varying, compared to the block interval time. However, most mobile channels experience fading. And symbol by symbol channel estimations and in turn each symbol time, selections of the SIC-performing user look infeasible in the practical environments. Then practically the block of symbols uses the single channel estimation, which is obtained by the training sequence at the head of the block. In this case, not all the symbol times the SIC is performed on the stronger channel user. Sometimes, we do perform the SIC on the weaker channel user; such cases, NOMA performs worse than OMA. Thus, we can say that by what percent NOMA is better than OMA. This paper calculates analytically the percentage by which NOMA performs better than OMA in the practical mobile communication systems. We show analytically that the percentage for NOMA being better than OMA is only the function of the ratio of the stronger channel gain variance to weaker. In result, not always, but almost time, NOMA could perform better than OMA.
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참고문헌 (12)
참고문헌 신청
L. Chettri / 2020 / A comprehensive survey on internet of things(IoT)toward 5G wireless systems / IEEE Internet of Things Journal 7(1):16~32
Y. Saito / 2013 / Non-orthogonal multiple access (NOMA) for cellular future radio access / Proc. IEEE 77th Vehicular Technology Conference (VTC Spring) :1~5
Z. Ding / 2016 / Impact of user pairing on 5G nonorthogonal multiple-access downlink transmissions / IEEE Trans. Veh. Technol 65(8):6010~6023
Z. Ding / 2017 / A survey on non-orthogonal multiple access for 5G networks : Research challenges and future trends / IEEE J. Sel. Areas Commun 35(10):2181~2195
Z. Chen / 2017 / An optimization perspective of the superiority of NOMA compared to conventional OMA / IEEE Trans. Signal Process 65(19):5191~5202
Y. Saito / 2013 / Non-orthogonal multiple access (NOMA) for cellular future radio access / Proc. IEEE 77th Vehicular Technology Conference (VTC Spring) :1~5
Z. Ding / 2016 / Impact of user pairing on 5G nonorthogonal multiple-access downlink transmissions / IEEE Trans. Veh. Technol 65(8):6010~6023
Z. Ding / 2017 / A survey on non-orthogonal multiple access for 5G networks : Research challenges and future trends / IEEE J. Sel. Areas Commun 35(10):2181~2195
Z. Chen / 2017 / An optimization perspective of the superiority of NOMA compared to conventional OMA / IEEE Trans. Signal Process 65(19):5191~5202
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