Turbo Trellis Coded Modulation (TTCM) with Imperfect Phase Reference

Yıl 2001, Cilt: 1 Sayı: 1, 1 - 5, 10.11.2011

Osman Ucan Onur Osman

Öz

ABSTRACT

In this paper, we investigate the performance of Turbo Trellis Coded Modulation (TTCM) over AWGN, and Rician

channels and assume that phase disturbance is available. As we know Turbo Trellis Coded Modulation (TTCM) is

similer to binary turbo codes, but employs Trellis Coded Modulation (TCM) codes which include multi-dimensional

codes. The combination of turbo codes with trellis codes leads to a strigthforward encoder structure, and allows iterative

decoding as binary turbo decoder. However, iterative Turbo Decoder needs to be adapted to the decoding of TCM

codes. Here, we investigate TTCM for 8PSK for several Rician parameter K and effective signal-to-noise ratio in the

carrier tracking loop a. Thus, our results will reflect the degredations both due to the effects of the fading on the

amplitude of the received signal and of a noisy carrier reference.

Keywords- Turbo Trellis Coded Modulation, Rician Channel, Imperfect Phase Reference

ÖZET

Bu makalede Turbo Kafes Kodlamalý (TKK) sistemlerin AWGN ve Rician ortamlarda faz bozulmasý durumunda hata

baþarýmý elde edilmiþtir. TKK yapýsý ikili Turbo modülasyonu gibidir ancak TKK çok boyutludur. Turbo kodlamanýn

Kafes Kodlama ile birlikte kulanýmý kodlayýcý yapýsýnýn deðiþimini gerektirir. Alýcýda ise ikili kodlayýcýlarda olduðu

gibi iteratif kod çözücü yapýsý vardýr. Burada 8PSK modülasyonda TKK farklý Rician katsayýsý K, faz bozulma katsayýsý

a için benzetim sonuçlarý elde edilmiþtir. Elde edilen sonuçlar hem genlikte hem de faz daki bozulmayý içermektedir.

Anahtar Kelimeler: Turbo Kafes Kodlama, Rician Kanal, Faz Bozulmasý

Anahtar Kelimeler

-