Comments: 5 pages, 5 figures, to be presented at IEEE ICT 2014 Subjects: Information Theory (cs.IT)

(Submitted on 10 Apr 2014) Abstract: 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 gibbs free energy 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 gibbs free energy messages. This can be achieved gibbs free energy 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 gibbs free energy LDPC codes.
Comments: 5 pages, 5 figures, to be presented at IEEE ICT 2014 Subjects: Information Theory (cs.IT) gibbs free energy ; Cryptography and Security gibbs free energy (cs.CR) Cite as: arXiv:1404.2864 [cs.IT]   gibbs free energy (or arXiv:1404.2864v1 [cs.IT] for this version)
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