• Permissible Code Groups (许用码组)
    • Coding that follow the requirement.
  • Forbidden Code Groups (禁用码组)
    • Vice.
  • A code with minimum distance d between its codewords can detect at most d-1 errors and can correct (d-1)/2 errors

Cyclic Coding

(n, k): ‘n’ is the length of the codeword (the message after it has been encoded), and ‘k’ is the length of the original message before encoding.