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In this work, we investigate a physical-layer key reconciliation protocol for a reciprocal, flat fading channel between two legitimate users. We consider the scenario when the n bits of the secret key are measured independently by Alice and Bob without a transmission over the channel. Due to reciprocity, the generated keys are identical except for noise at both ends. We assume Gaussian noise and ignore...
A locally decodable source code (LDSC) allows the recovery of arbitrary parts of an unencoded message from its encoded version, using only a part of the encoded message as input, a challenge that arises when searching within compressed data sets. Simple source codes such as Huffman codes or Lempel-Ziv compression are not well suited to this task: A decoder starting at an arbitrary point within the...
Substantial imperfections in carbon nanotube (CNT) field-effect transistors (CNFETs) are one key obstacle to the demonstration of large-scale CNFET circuits. In this paper, we first categorize transistors based on the impact of resizing on yield improvement and delay penalty for logic circuits. Then we propose an approach to size transistors in different categories by using redundant CNTs to improve...
For exploiting the spatial redundancy in intra coded coding unit (CU), a block-based angular intra prediction is defined in high efficiency video coding (HEVC). In lossless coding condition without transform, quantization, and in-loop filter, pixel wise differential pulse code modulation (DPCM) achieves better coding improvement than block-based prediction since it is possible to make intra prediction...
A new joint source and channel decoding algorithm for forth generation wireless systems is proposed. The fact that only part of the information sequence are source bits and have residual redundancy that can be used for joint decoding is taken into account. The goal of the algorithm is the correct reception of the correlated bits using joint and list decoders, after that correctly decoded values are...
A study of the iterations stopping criteria adapted to multi-non-binary turbo-decoders, based on the evolution of a posteriori probability density (APP) is presented. The performaces bit / frame error rate (B/FER) versus signal to noise ratio (SNR) of multi-non-binary turbo codes (MNBTC) equipped with the iterations stopping mechanism proposed in this study are compared with those obtained using the...
In this paper, we propose a new framework for compressive video sensing (CVS) that exploits the inherent spatial and temporal redundancies of a video sequence, effectively. The proposed method splits the video sequence into the key and non-key frames followed by dividing each frame into the small non-overlapping blocks of equal sizes. At the decoder side, the key frames are reconstructed using adaptively...
Limited to the traditional digital transmission design which forces the source to pick a single bit rate supported by the worst receiver to transmit data, the mobile video broadcast service cannot provide better video qualities to the receivers with better channels. This paper proposes an analog coding and transmission scheme named Realcast to provide channel adaptive video broadcast service. It utilizes...
Error Correcting Output Coding (ECOC) is a widely used and successful technique that implements a classification system by splitting a multiclass problem into a set of dichotomies according to a coding matrix. In this paper we propose a new approach for the ECOC systems based on a well-known family of error correcting codes in the Coding Theory: the Low Density Parity Check (LDPC) codes. The goal...
Within this paper, we investigate efficient communication by means of network coding in a unicast scenario. Packets can be lost due to errors or attacks, hence, redundant data packets are necessary to ensure a successful transmission. In the ideal case, the level of redundancy should correspond to the given loss rate. However, the loss rate may be unknown in practice. We investigate methods for determining...
Multi-write codes hold great promise to reduce write amplification in flash-based storage devices. In this work we propose two novel mapping architectures that show clear advantage over known schemes using multi-write codes, and over schemes not using such codes. We demonstrate the advantage of the proposed architectures by evaluating them with industry-accepted benchmark traces. The results show...
The article addresses the problem of constructing a multiple access system for a multi-user vector adder channel (the channel with intensity information or the B-channel). To solve the problem we propose an asynchronous1 coding scheme employing a single-user detection. For the resulting multiple access system we estimate the probability of wrong decoding. Based on this result an asymptotic lower estimate...
In the paper the problem of metric description of processes defined by two-state Markov models is considered. The class of special metrics is presented, the approach of matching the metrics from this class with the Markov models is proposed. In the special case of simple Markov chain the metric matched with Markov chain for large set of its parameters is given. The metric may be used in decision-making...
In what follows signal-code constructions employing block and convolutional nonbinary inner codes that can perform under severe jamming are proposed. Robustness of the proposed signal-code constructions to jamming is verified by means of simulation.
In this paper we describe ensemble of Low-Density Parity-Check (LDPC) block codes based on Partial Unit Memory (P)UM codes. We study a decoding performance of received ensemble in the case of different parameters of constituent LDPC codes. The results of simulation of obtained code constructions for an iterative “belief propagation” (Sum-Product) decoding algorithm, applied in the case of transmission...
We propose a construction of general concatenated code that uses low-density parity check codes as component codes. This construction itself can also be considered as low-density parity-check code and decoded using Belief Propagation algorithm. Performances of several decoders are compared; it's shown that this code can be efficiently decoded by proposed soft decoding algorithm or combining BP and...
In this paper the problem of decoder side error concealment is considered. A comparison of several restoration methods is presented. All the compared methods belong to the class of exemplar based inpainting algorithms. It is shown that patch based methods are effective for restoration of small macroblocks while block based methods are effective for restoration of large macroblocks.
Wireless video stream delivery is choppy. This problem becomes much severer in MU-MIMO's simultaneous video transmission within the same band. Conventional schemes achieve graceful video delivery by harnessing from high data redundancy. However, with concurrent transmission in the same band, the leverage of high data redundancy leads to high probability of collisions and packets loss, which limits...
The implementation of Reed-Solomon encoder and decoder for RS(255,239) is proposed. Reed-Solomon codes are used for error detection and correction for reliable communication on noisy channel. Error correction codes are also known as forward error correction codes because it avoids the back-channel or retransmission of data. So, Reed-Solomon codes are preferred for error checking. The main part of...
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