期刊
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
卷 69, 期 12, 页码 16304-16308出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TVT.2020.3041260
关键词
Caching; imperfect channel state information (CSI); non-orthogonal multiple access (NOMA); vehicular communications
资金
- National Natural Science Foundation of China [62001191, U1809211, 61771202]
- Natural Science Foundation of Guangdong Province [2018B030306005]
- Open Research Fund of the National Mobile Communications Research Laboratory, Southeast University [2020D03]
- EPSRC [EP/R006377/1]
- Fundamental Research Funds for the CentralUniversities [21620351, 2019SJ02]
- EPSRC [EP/R006377/1] Funding Source: UKRI
In this paper, we investigate a hybrid multicast/unicast scheme for a multiple-input single-output cache-aided non-orthogonal multiple access (NOMA) vehicular scenario in the face of rapidly fluctuating vehicular wireless channels. Considering a more practical situation, imperfect channel state information is taking into account. In this paper, we formulate an optimization problem to maximize the unicast sum rate under the constraints of the peak power, the peak backhaul, the minimum unicast rate, and the maximum multicast outage probability. To solve the formulated non-convex problem, a lower bound relaxation method is proposed, which enables a division of the original problem into two convex sub-problems. Computer simulations show that the proposed caching-aided NOMA is superior to the orthogonal multiple access counterpart.
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