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This paper studies the effects of heterogeneity in DO networks and proposes measures for reducing or removing them. In particular, two types of imbalance, i.e., f-Imbalance and OH-Imbalance are identified and methods for compensating them, i.e., RL padding and AT overhead (OH) channel boost, are proposed. The effectiveness of the proposed methods is demonstrated through both, developing an analytic...
Communications usually do not have enough security. One of the ways for making the data secure is using methods for coding the information in a special manner. In this article one of the algorithms of coding and decoding information has been reviewed and explained. Coding is converting information to the form of coded text and decoding is the operation of converting coded information to the original...
In this paper a modified Offset Min-Sum decoding algorithm for Low-Density Parity Check Codes is presented. In this modified algorithm, the offset factor in the original Offset Min-Sum algorithm is adjusted iteratively with the assistance of the check-node computation outputs of the Normalized Min-Sum algorithm. As a result, the offset factor in our modified algorithm can be calculated adaptively...
The computational complexity of H.264 video coding standard is two or three times higher than that of H.263 and MPEG-4. Especially, the operations of the entropy coding and deblocking filter are the most complex parts in the decoder. In order to reduce the computational complexity of these operations, we propose a fast algorithm for H.264 decoder implementation, which containing a group-based CAVLC...
In this paper, we propose a method to enhance the application of importance sampling (IS) technique for efficient simulation of Viterbi decoded terminated convolutional codes. The proposed method exploits the weight enumerators of terminated convolutional codes to enhance the performance of the IS technique known as error event simulation (EES). The essence of the proposed technique is to simulate...
In this work we consider the communication of information in the presence of an online adversarial jammer. In the setting under study, a sender wishes to communicate a message to a receiver by transmitting a codeword x = (xi,..., xn) symbol-by-symbol over a communication channel. The adversarial jammer can view the transmitted symbols xt one at a time, and can change up to a p-fraction of them. However,...
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