Two-thirds rate modulation and coding scheme for Rayleigh fading channels

摘要

The present invention is a method for generating short, non-systematic, non-linear (6,4) codes that may be implemented in a 4-ARY quadrature-quadrature phase shift keying (QQPSK or Q²PSK) system over GF(16). The codewords are non-systematic in that they do not directly contain the information that is to be transmitted and six symbols are sent to represent four symbols. The present invention uses a code construction method that generates two small, hand-optimized codeword sets and combines those two codeword sets to create two larger codeword sets. The two larger codeword sets are then combined to create a codeword set that is stored in a look-up table for use at a transmission station.