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Tallini and Bose introduced a recursive method to construct second-order spectral-null codes which result in short (information length 16) base optimal second-order spectral-null codes that can be easily implemented either with table lookup or enumerative coding. In this brief contribution, the extended base suboptimal second-order spectral-null codes (17 information length 32) obtained from two short base codes by lookup table are used to reduce the overall code length.
Balanced codes, dc-free codes, high-order spectral-null codes, 1--EC/AUED codes.

D. Lee and C. Yang, "Some New Efficient Second-Order Spectral-Null Codes with Small Lookup Tables," in IEEE Transactions on Computers, vol. 55, no. , pp. 924-927, 2006.
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