Constructions and bounds for systematic tEC/AUED codes

Several methods of constructing systematic t-error correcting/all unidirectional error-detecting codes are described. These codes can be constructed by adding a tail to a linear t-error correcting code, but other constructions presented are more of an ad hoc nature. These codes will often be found as suitably chosen subsets of nonsystematic tEC/AUED codes. Further bounds on the word length of systematic tEC/AUED codes are derived, and extensive tables are given.<
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