The Encoder Design of Punctured Turbo Trellis Coded Modulation applied to MPSK

  • Seon, Wang-Seok (Department of Radio Science and Communication Engineering, Hongik University) ;
  • Kim, Youn-Hyoung (Department of Radio Science and Communication Engineering, Hongik University) ;
  • Lee, Ho-Kyung (School of Electronic and Electric Engineering, Hong-Ik University)
  • Published : 2002.07.01

Abstract

This paper introduces an encoder design method of Turbo TCM (Trellis Coded Modulation) with symbol puncturing. TTCM consists of two simple trellis codes in parallel and modulator. To obtain an good encoder, we calculate the free distance by the assumption that the punctured symbol is transmitted from the subset that consist of signals with the same systematic bit at random. We develop a search program to find the component encoder which maximize the free distance. Especially, for 8-PSK with code rate 2/3, we search for the component codes. We find a new encoder which has better BER performance than that of Robertson′s encoder. We verify the results through the simulation."

Keywords