Mao Chao Lin

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— We provide useful results on two classes of convolutional codes: binary codes and nonbinary codes. The best codes or the best known codes for these two classes of convolutional codes are found by computer search. Some of them are better than those found in the past. We specify these codes by their transfer function matrices, distance spectra, and(More)
—Runlength-limited (RLL) codes are used in magnetic recording. The error patterns that occur with peak detection magnetic recording systems when using a runlength-limited code consist of both symmetric errors and shift errors. We will refer to shift errors and symmetric errors collectively as mixed-type errors. In this correspondence, a method of providing(More)
1139 [XI R. M. Gray, "Time-invariant trellis encoding of ergodic discrete-time sources with a fidelity criterion," IEEE Truns. Inform. Theory, vol.Stack algorithm speech encoding with fixed and variable symbol release rules," IEEE Trans. Abstract-The (n, k , d 2 2t + 1) binary linear codes are studied, which are used for correcting error patterns of weight(More)
In this paper, we first investigate the distance structure of cyclic codes of composite length. A lower bound on the minimum distance for this class of codes is derived. In many cases, the lower bound gives the true minimum distance of a code. Then, we investigate the distance structure of the direct sum of two cyclic codes of composite length. We show(More)
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