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A coding scheme for the Gaussian wiretap channel based on low-density parity-check (LDPC) codes is presented. The messages are transmitted over punctured bits to hide data from eavesdroppers. It is shown by means of density evolution that the BER of an eavesdropper, who operates below the code's SNR threshold and has the ability to use a bitwise MAP decoder, increases to 0.5 within a few dB. It is...
Though LDPC codes have been accepted by DVB-S2, the LDPC encode of DVB-S2 (digital video broadcasting satellite second generation) are difficult to be implemented for their huge code lengths of 16200 bits and 64800 bits). To shorten the codes will lead the problems of girth-4 and lower weight codes. This paper analyzed the possible reasons leading to the problems, and revised the current code construction...
In this work, we propose an unequal error protection (UEP) scheme for scalable video coding using low density parity check (LDPC) codes. LDPC codes are renowned for their near-capacity performance. In the proposed framework, a video sequence is coded based on scalable video coding (SVC) H.264/AVC standard document. We divide the SVC coded video stream into different sub-streams in terms of time and...
In this paper, a method for constructing low-density parity-check (LDPC) codes of good performance in terms of bit error rate (BER) using a computer search algorithm is presented. First, LDPC codes and encoding along with its Tanner graph representation is described. Then, a detailed description of the proposed construction algorithm is given. A modified shortest-path (MSP) algorithm of lower complexity...
The weight spectrum of sequences of binary linear codes that achieve arbitrarily small word error probability on a class of noisy channels at a nonzero rate is studied. We refer to such sequences as good codes. The class of good codes includes turbo, low-density parity-check, and repeat-accumulate codes. We show that a sequence of codes is good when transmitted over a memoryless binary-symmetric channel...
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