LDPC coded transmissions over the Gaussian broadcast channel with confidential messages

We design and assess some practical low-density parity-check (LDPC) coded transmission schemes for the Gaussian broadcast channel with confidential messages (BCC). This channel model is different from the classical wiretap channel model as the unauthorized receiver (Eve) must be able to decode some...

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Bibliographic Details
Published in:arXiv.org 2014-04
Main Authors: Baldi, Marco, Maturo, Nicola, Ricciutelli, Giacomo, Chiaraluce, Franco
Format: Article
Language:English
Subjects:
Binary system
Codes
Component reliability
Cybersecurity
Design analysis
Error correcting codes
Feasibility studies
Low density parity check codes
Messages
Wiretapping
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Summary:We design and assess some practical low-density parity-check (LDPC) coded transmission schemes for the Gaussian broadcast channel with confidential messages (BCC). This channel model is different from the classical wiretap channel model as the unauthorized receiver (Eve) must be able to decode some part of the information. Hence, the reliability and security targets are different from those of the wiretap channel. In order to design and assess practical coding schemes, we use the error rate as a metric of the performance achieved by the authorized receiver (Bob) and the unauthorized receiver (Eve). We study the system feasibility, and show that two different levels of protection against noise are required on the public and the secret messages. This can be achieved in two ways: i) by using LDPC codes with unequal error protection (UEP) of the transmitted information bits or ii) by using two classical non-UEP LDPC codes with different rates. We compare these two approaches and show that, for the considered examples, the solution exploiting UEP LDPC codes is more efficient than that using non-UEP LDPC codes.
ISSN:2331-8422
DOI:10.48550/arxiv.1404.2864