Q-codes

some designs and codes from l_2(q)

for $q in {7,8,9,11,13,16}$, we consider the primitive actions of $l_2(q)$ and use key-moori method 1 as described in [codes, designs and graphs from the janko groups {$j_1$} and{$j_2$}, {em j. combin. math. combin. comput.}, {bf 40} (2002) 143--159., correction to: ``codes, designs and graphs from the janko groups{$j_1$} and {$j_2$}'' [j. combin. math. combin. comput. {bf 40} (2002) 143--159],...

Prefixless q-ary Balanced Codes

We will present a Knuth-like method for balancing q-ary codewords, which is characterized by the absence of a prefix that carries the information on the balancing index. Lookup tables for coding and decoding the prefix are avoided. Index Terms Constrained code, balanced code, running digital sum, Knuth code, error correction.

Nonequivalent q-ary Perfect Codes

Maximum distance q -nary codes

t immaru-A q-nary error-correcting code with N = qk code words of length n = k + r can have no greater miniium distance d than r + 1. The class of codes for which d = r + 1 is studied first in general, then with the restriction that the codes be linear. Examples and construction methods are given to show that these codes exist for a number of values of q, k, and r. Proof: Pick any k position. T...

Construction of new completely regular q-ary codes from perfect q-ary codes

In this paper from q-ary perfect codes a new completely regular q-ary codes are constructed. In particular two new ternary completely regular codes are obtained from the ternary Golay [11,6,5] code and new families of q-ary completely regular codes are obtained from q-ary 1-perfect codes.