Uçan, Osman N. | Osman, Onur | Gümüş, Aykal

Article | 2001 | Istanbul University Journal of Electrical and Electronics Engineering1 ( 2 ) , pp.149 - 168

In this paper, the performance of turbo coded signals are investigated over a new channel model, denoted as 1 ± Dn / Partial Response Fading Channels (PRFC) with imperfect phase reference. The combined effects of the 1 ± Dn /PRFC and nonideal coherent receiver on the phase of the received amplitude and of a noisy carrier reference are considered, each modelled by the Rician and Tikhonov distributions respectively. As an example, the jitter performance of turbo coded signals are evaluated over 1D / PRSC channel with different fading parameter K, effective signalto-noise ratio in the carrier tracking loop a, iteration nu . . .mber and data block size N. The numerical results clearly demonstrate the error performance degradation due to both amplitude fading and phase noise process Daha fazlası Daha az

Uçan, Osman N. | Osman, Onur | Osman, Onur

Article | 2001 | Istanbul University Journal of Electrical and Electronics Engineering1 ( 1 ) , pp.1 - 5

Bu makalede Turbo Kafes Kodlamalı (TKK) sistemlerin AWGN ve Rician ortamlarda faz bozulması durumunda hata başarımı elde edilmiştir. TKK yapısı ikili Turbo modülasyonu gibidir ancak TKK çok boyutludur. Turbo kodlamanın Kafes Kodlama ile birlikte kulanımı kodlayıcı yapısının değişimini gerektirir. Alıcıda ise ikili kodlayıcılarda olduğu gibi iteratif kod çözücü yapısı vardır. Burada 8PSK modülasyonda TKK farklı Rician katsayısı K, faz bozulma katsayısı a için benzetim sonuçları elde edilmiştir. Elde edilen sonuçlar hem genlikte hem de faz daki bozulmayı içermektedir. In this paper, we investigate the performance of Turbo Trellis Code . . .d 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 cafrier 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 Daha fazlası Daha az