Improved construction methods for error correcting constant weight codes

Two construction methods for t error correcting constant weight codes are developed. Both of these methods are improvements over the existing codes. One construction is recursive, which is based on the observation that a 2t error correcting code can be built by concatenating two t error correcting codes. This results in the reduction of code word length for higher t values. The other construction method also builds a 2t error correcting code by augmenting the codes of smaller error correcting capabilities as check symbols. Existing construction methods are used to build these check symbols so that the length of the code word will be optimized.<>