A new code capable of correcting a single asymmetric error is proposed. This code is of length 19 and has 28142 codewords, improving the best known code by 110 code words.
A new code capable of correcting a single asymmetric error is proposed. This code is of length 19 and has 28142 codewords, improving the best known code by 110 code words.
During primary encoding, the elements of the original message are assigned certain numbers, usually in binary form. The code combinations of n binary symbols formed in this way differ from each other by a certain code...
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A method of providing error protection for (d,k) constrained sequences is examined. The cases of single error detection and single error correction are considered, where the single error is allowed to be a shift error...
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A method of providing error protection for (d,k) constrained sequences is examined. The cases of single error detection and single error correction are considered, where the single error is allowed to be a shift error or a symmetric error. Codes for single error detection and for single error correction are constructed by inserting parity blocks into the (d,k) constrained sequence. Bounds are considered on the length of the parity blocks for single error detection and for single error correction.
A class of codes recently introduced and now being used for digital system test compaction are addressed. Theorems and constructive bounds are given for certain classes of X-codes. It is shown that minimal codes are g...
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A class of codes recently introduced and now being used for digital system test compaction are addressed. Theorems and constructive bounds are given for certain classes of X-codes. It is shown that minimal codes are guaranteed to exist, but are not necessarily unique or non-trivial.
An analytical method for evaluating performance data of algebraically decoded linear unequal error protection codes used on burst error channels is presented. Position-related performance data are introduced to charac...
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An analytical method for evaluating performance data of algebraically decoded linear unequal error protection codes used on burst error channels is presented. Position-related performance data are introduced to characterize the decoding events with regard to assessing the error protection level attached to each code word position. The method is based on an automata model of the channel-decoder-cascade described by a compound automaton. The decoder is considered to be a deterministic evaluation device visualized by a code trellis. To investigate the error protection level at a fixed code word position, the trellis is dissected into two trellises corresponding to that position. The performance analysis can be performed in a transform domain. The position-related transform coefficients are connected with the position-related coset probabilities by a Walsh-Hadamard-Transformation.
作者：
Papaharalabos, S.Sweeney, P.Evans, B.G.
University of Surrey Guildford Surrey GU2 7XH United Kingdom CCSR
Department of Electronic Engineering University of Surrey Guildford Surrey GU2 7XH United Kingdom
In this paper two normalization methods are considered to improve the performance of the iterative soft output Viterbi algorithm (SOVA). This is mainly because of the nature of the SOVA, which is a sub-optimum algorit...
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A new systematic code for a single bit error correction is proposed. The coding and decoding processes are based on integer modulo arithmetic, easily performed by computer.
A new systematic code for a single bit error correction is proposed. The coding and decoding processes are based on integer modulo arithmetic, easily performed by computer.
Contrary to real-time services, for data-centric services that are tolerant of latency, transmission with modulation and coding rates selected according to the instantaneous channel condition can increase the system t...
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Typical coding schemes for magnetic or optical recording usually consist of two coding stages, error correcting coding (ECC) followed by line or modulation coding. Two methods are presented to design a line code with ...
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Typical coding schemes for magnetic or optical recording usually consist of two coding stages, error correcting coding (ECC) followed by line or modulation coding. Two methods are presented to design a line code with error correcting capability. Both methods modify the linear error-correcting codes so that they satisfy the runlength constraints of runlength-limited (RLL) sequences. Through these methods we construct combined ECC/RLL codes with different runlengths. The first method utilizes linear combination of ECC codewords with a modification vector. The second method uses two-dimensional code to design the required ECC/RLL code. Both methods are basically dependent on binary operations and minor changes to the ECC coding/decoding circuitry are required. Asymptotic upper bound on the maximum runlength for both methods is found and the performance of the proposed ECC/RLL codes with conventional multistage cascaded schemes of ECC and RLL is also studied.
This paper described a new high-speed search method based on newly introduced conditions holding the relationship among tape speed, drum rotation speed and number of recording tracks per frame for good quality images.
ISBN:
(纸本)0780308433
This paper described a new high-speed search method based on newly introduced conditions holding the relationship among tape speed, drum rotation speed and number of recording tracks per frame for good quality images.
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