NDLI: LDPC codes over Gaussian multiple access wiretap channel

Content Provider	IET Digital Library
Author	Shahbaz, Sahar Akhbari, Bahareh Asvadi, Reza
Abstract	The authors study the problem of two-user Gaussian multiple access channel (GMAC) in the presence of an external eavesdropper, where all transmitted messages should be kept confidential against the eavesdropper. For this purpose, they propose a secure coding scheme on this channel which utilises low-density parity-check (LDPC) codes by employing random bit insertion and puncturing techniques. At each encoder, the confidential message with some random bits as a random message are systematically encoded, and then the associated bits to the confidential message are punctured. Next, the encoders send their unpunctured bits over a Gaussian multiple access wiretap channel (GMAC-WT). The puncturing distribution applied to the LDPC code is considered in random and optimised cases. They utilise a modified extrinsic information transfer chart analysis to optimise the puncturing distributions. The security gap is used as a measure of secrecy. They compared the achieved secure rate pair with an achievable secrecy rate region of GMAC-WT to show the effective performance of the proposed scheme. In this study, equal and unequal power conditions at the transmitters are investigated. For both cases, they attain a fairly small security gap which is equivalent to achieve the points near the secrecy rate region of GMAC-WT.
Starting Page	962
Ending Page	969
Page Count	8
ISSN	17518628
Volume Number	12
e-ISSN	17518636
Issue Number	Issue 8, May (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-com/12/8
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-com.2017.1197
Journal	IET Communications
Publisher Date	2018-02-06
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Achieved Secure Rate Pair Associated Bits Channel Capacity Channel Coding Code Confidential Message Encoder Encoding External Eavesdropper Gaussian Channel Gaussian Multiple Access Wiretap Channel GMAC-WT LDPC Code Legitimate Receiver Low-density Parity-check Code Lower Signal-to-noise Ratio Multi-access System Parity Check Code Puncturing Distribution Puncturing Technique Radio Link And Equipment Random Bit Insertion Random Bits Random Message Secure Coding Scheme Security Gap Sent Messages Statistics Telecommunication Security Transmitted Messages Two-user Gaussian Multiple Access Channel Unpunctured Bits
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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