POWER AND BANDWIDTH EFFICIENT DIGITAL-COMMUNICATION USING TURBO DIODES IN MULTILEVEL CODES

The recently proposed Turbo codes are applied to bandwidth efficient m odulation schemes via multilevel coding. For this purpose, Turbo codes are extended for a wide range of fine tunable rates by puncturing. A straightforward derivation of iterative Turbo decoding and the concept of extrinsic information is presented. New design rules for multileve l codes with arbitrary component codes and codeword lengths are derive d from information theory. Simulation results show that application of Turbo codes to properly designed multilevel coding schemes leads to d igital transmission schemes with high power and bandwidth efficiency.