Visible to the public Biblio

Filters: Keyword is non-orthogonal multiple access  [Clear All Filters]
2022-05-10
Su, Nuğman, Panayirci, Erdal, Koca, Mutlu, Haas, Harald.  2021.  Transmit Precoding for Physical Layer Security of MIMO-NOMA-Based Visible Light Communications. 2021 17th International Symposium on Wireless Communication Systems (ISWCS). :1–6.
We consider the physical layer security (PLS) of non-orthogonal multiple access (NOMA) enabled multiple-input multiple-output (MIMO) visible light communication systems in the presence of a passive eavesdropper (Eve). In order to disrupt the decoding process at Eve, we propose a novel precoding scheme reinforced with random constellation coding. Multiple legitimate users (Bobs) will be served simultaneously using NOMA. For the proposed precoder design, we exploit the slow-fading characteristics of the visible light channel so that the transmitted symbols are successfully decoded at Bob, while Eve suffers from very high bit error ratios (BERs) due to precoding-induced jamming. Via computer simulations, we show that Bob can successfully decode their own information in various user configurations and receiver diversities. It is also shown that the BER at Eve's side is increased to the 0.5-level for similar and the asymmetrical positioning of Bob with respect to the transmitter, thus PLS is ensured by the proposed preceding technique.
2017-12-20
Xiang, Z., Cai, Y., Yang, W., Sun, X., Hu, Y..  2017.  Physical layer security of non-orthogonal multiple access in cognitive radio networks. 2017 9th International Conference on Wireless Communications and Signal Processing (WCSP). :1–6.

This paper investigates physical layer security of non-orthogonal multiple access (NOMA) in cognitive radio (CR) networks. The techniques of NOMA and CR have improved the spectrum efficiency greatly in the traditional networks. Because of the difference in principles of spectrum improving, NOMA and CR can be combined together, i.e. CR NOMA network, and have great potential to improving the spectrum efficiency. However the physical layer security in CR NOMA network is different from any single network of NOMA or CR. We will study the physical layer security in underlay CR NOMA network. Firstly, the wiretap network model is constructed according to the technical characteristics of NOMA and CR. In addition, new exact and asymptotic expressions of the security outage probability are derived and been confirmed by simulation. Ultimately, we have studied the effect of some critical factors on security outage probability after simulation.