Institute for Experimental Mathematics

Essen, Germany

Institute for Experimental Mathematics

Essen, Germany
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Van Wijngaarden A.J.,Alcatel - Lucent | Schouhamer Immink K.A.,Turing Inc. | Schouhamer Immink K.A.,Institute for Experimental Mathematics | Schouhamer Immink K.A.,Data Storage Institute Singapore
IEEE Journal on Selected Areas in Communications | Year: 2010

The sequence replacement technique converts an input sequence into a constrained sequence in which a prescribed subsequence is forbidden to occur. Several coding algorithms are presented that use this technique for the construction of maximum run-length limited sequences. The proposed algorithms show how all forbidden subsequences can be successively or iteratively removed to obtain a constrained sequence and how special subsequences can be inserted at predefined positions in the constrained sequence to represent the indices of the positions where the forbidden subsequences were removed. Several modifications are presented to reduce the impact of transmission errors on the decoding operation, and schemes to provide error control are discussed as well. The proposed algorithms can be implemented efficiently, and the rates of the constructed codes are close to their theoretical maximum. As such, the proposed algorithms are of interest for storage systems and data networks. © 2010 IEEE.


Papilaya V.N.,Institute for Experimental Mathematics | Vinck A.J.H.,Institute for Experimental Mathematics | Ouahadaz K.,University of Johannesburg | Mengi A.,Devolo AG | And 2 more authors.
IEEE ISPLC 2014 - 18th IEEE International Symposium on Power Line Communications and Its Applications | Year: 2014

In the smart grid, the G3-PLC solution is in direct competition with other IP-based communications technologies such as GPRS or DSL. In this paper, we present the devolo's 500 kHz G3-PLC access technology and it's analysis based on smart grid field trials in Germany. The focus of the analysis in this paper is concentrated on the following parameters: The influencing factor of near and far transmission throughput, the influence of a repeater on the throughput, and the influence of different UDP packet size on the throughput. © 2014 IEEE.


Balakirsky V.B.,Institute for Experimental Mathematics | Vinck A.J.H.,American University of Armenia
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2011

We analyze the model where the outcomes of biometric measurements of a person are expressed by a ternary vector whose components equal to a special symbol*are considered as information that the corresponding parameters are non-significant. The 0 and 1 components show the types of significant parameters. The authentication of a person on the basis on significant parameters is reduced to the decoding of data transmitted over a binary-input and ternary-output channel. A special authentication algorithm that differs from the maximum likelihood decoding and forces an attacker to use the so-called "fair gambling strategy" is proposed. © 2011 Springer-Verlag.


Lee J.,LG Corp | Schouhamer Immink K.A.,Institute for Experimental Mathematics
IEEE Transactions on Consumer Electronics | Year: 2011

This paper proposes a soft-reliability informationbased post-Viterbi processor for reducing miss-correction of an error correlation filter-based post-Viterbi processor. The essential difference between the soft-reliability informationbased and the error correlation filter-based post-Viterbi processors, is how to locate the most probable error starting position. The new scheme determines an error starting position based on a soft-reliability estimate, while the conventional scheme chooses an error starting position based on likelihood value. Among all likely error starting positions for prescribed error events, the new scheme attempts to correct errortype corresponding to the position only if there exists a position where the soft-reliability estimate is negative, while the conventional scheme performs error correction based on errortype and its error starting position of an error event associated with the maximum likelihood value. A correction made by the conventional scheme may result in miss-correction because the scheme does not have any criterion for judgment whether an estimated error starting position is correct. In case error correction is only performed when a position with negative soft-reliability estimate exists, the probability of miss-correction of the new scheme is less than the one of the conventional scheme. © 2011 IEEE.


Lee J.,LG Corp | Immink K.A.S.,Institute for Experimental Mathematics
IEEE Transactions on Consumer Electronics | Year: 2011

This paper proposes a new soft-reliability information-based post-Viterbi processor with advanced noise-robustness for reducing probability of miss-correction and no correction of a conventional soft-reliability-based post-Viterbi processor. Among all likely error starting positions for prescribed error events, the two schemes are equal to attempt to correct error-type corresponding to a position with minimum one only if there exist positions where a soft-reliability estimate is negative. The main difference between the two schemes is how they acquire the softreliability estimate. The soft-reliability estimate of the new scheme is obtained through the elimination of the noisesensitive component from the log-likelihood ratio of the posteriori probabilities, which is the soft-reliability estimate of conventional scheme. As a result, the new scheme is based on more reliable soft-reliability information so reducing the probability of miss-correction and no correction. © 2006 IEEE.


Lukusa T.,University of Johannesburg | Ouahada K.,University of Johannesburg | Ndjiongue A.R.,University of Johannesburg | Ferreira H.C.,University of Johannesburg | Vinck A.J.H.,Institute for Experimental Mathematics
IEEE ISPLC 2014 - 18th IEEE International Symposium on Power Line Communications and Its Applications | Year: 2014

In recent years, given the prominence of the electrical distribution network, power line communications channel has drawn interests among researchers throughout the globe. M-ary FSK modulation scheme has been extensively used when combined with certain error correcting codes because of its viability and robustness over the power line communications channel. In this paper, we make use of the sign changes property in the Hadamard transform combined together with convolutional codes and M-ary FSK modulation scheme to experimentally use the technique of "frequency mappings" in a real power line environment. Interesting experimental results show that this technique is very useful without the need of combining coding techniques and modulations that is usually based on the combination of convolutional codes and M-FSK modulation schemes. © 2014 IEEE.


Lee J.,LG Corp | Immink K.A.S.,Institute for Experimental Mathematics
IEEE Transactions on Consumer Electronics | Year: 2010

A post-Viterbi processor has found wide acceptance in recording systems since it can correct dominant error events at the channel detector output using only a few parity bits, and thereby significantly reduce the correction capacity loss of the error correction code. This paper presents two novel techniques for minimizing the mis-correction of a post-Viterbi processor based on an error detection code. One is a method for achieving a low probability of mis-selection in actual error-type. The other is a method for achieving a low probability of mis-positioning in error-location of an occurred error event. Simulation results show that an application of these techniques to conventional post-Viterbi processor considerably reduces the probability of mis-correction and the performance approaches the corresponding bit error rate and symbol error rate bound. © 2006 IEEE.

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