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Secure Transmission with Randomized Constellation Rotation for Downlink Sparse Code Multiple Access System

Lai, Ke, Lei, Jing, Wen, Lei, Chen, Gaojie, Li, Wei and Xiao, Pei (2017) Secure Transmission with Randomized Constellation Rotation for Downlink Sparse Code Multiple Access System IEEE Access, 6. pp. 5049-5063.

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Sparse code multiple access (SCMA) is a promising candidate air interface of next-generation mobile networks. In this paper, we focus on a downlink SCMA system where a transmitter sends confidential messages to multiple users in the presence of external eavesdroppers. Consequently, we develop a novel secure transmission approach over physical layer based on a highly structured SCMA codebook design. In our proposed scheme, we rotate the base constellations (BCs) with random angles by extracting channel phases from the channel state information (CSI). By employing randomized constellation rotation (RCR), the security of downlink SCMA can be ensured. In addition, a tight SCMA upper bound is introduced to guide the design of the encrypted codebook. As a result, we propose an approach to avoid the significant error rate performance loss caused by using codebooks that are designed using our method. The proposed upper-bound-aided codebook design scheme can select relatively good codebooks with low complexity. By combining SCMA codebook design and secure communication, our scheme ensures security for massive quantities of users with low encrypted and decrypted complexity at the cost of transmission rate and possible error rate performance loss. Moreover, the proposed scheme can achieve robustness against channel estimation errors. Analyses and Monte Carlo simulations confirm the effectiveness of our scheme.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :
Date : 10 November 2017
Identification Number : 10.1109/ACCESS.2017.2772259
Copyright Disclaimer : This work is licensed under a Creative Commons Attribution 3.0 License. For more information, see Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
Uncontrolled Keywords : 5G; Secure communications; SCMA; Constellation rotation; Cryptography; Downlink; NOMA; Error analysis; Complexity theory; Transmitters
Depositing User : Clive Harris
Date Deposited : 21 Nov 2017 13:47
Last Modified : 14 Mar 2018 13:08

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