NDLI: DC-free error-correcting codes based on convolutional codes

Content Provider	IEEE Xplore Digital Library
Author	Mao-Ching Chiu
Copyright Year	1972
Abstract	A new construction of direct current (DC)-free error-correcting codes based on convolutional codes is proposed. The new code is constructed by selecting a proper subcode from a convolutional code composed of two different component codes. The encoder employs a Viterbi algorithm as the codeword selector so that the selected code sequences satisfy the DC constraint. A lower bound on the free distance of such codes is proposed, and a procedure for obtaining this bound is presented. A sufficient condition for these codes to have a bounded running digital sum (RDS) is proposed. Under the assumption of a simplified codeword selection algorithm, we present an upper bound on the maximum absolute value of the RDS and derive the sum variance for a given code. A new construction of standard DC-free codes, i.e., DC-free codes without error-correcting capability, is also proposed. These codes have the property that the decoder can be implemented by simple symbol-by-symbol hard decisions. Finally, under the new construction, we propose several codes that are suitable for the systems that require small sum variance and good error-correction capability.
Starting Page	609
Ending Page	619
Page Count	11
File Size	255442
File Format	PDF
ISSN	00906778
Volume Number	49
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-04-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Error correction codes Convolutional codes Decoding Block codes Viterbi algorithm Sufficient conditions Upper bound Code standards Optical recording Signal design
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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