Title :
On design of TCM in channels with different fading
Author :
Wang, Michael ; Yuan, Dongfeng
Author_Institution :
Dept. of Electr. Eng., Shandong Univ.
Abstract :
When trellis coded modulation (TCM) is used on fading channels with interleaving/deinterleaving, the design of the codes for optimum performance is guided by the length of the shortest error event path and the product of the branch distance along that path. It is shown for a Rician fading channel, with a large value of the fading factor, that these two criteria are unsuitable for optimum code design. Simulation is used to compare the error performance of three differently designed, 4-state rate, 2/3 trellis codes in channels with different fading. The results show that when the fading factor is larger than ten, the primary design criterion of TCM in a Rician fading channel is the free Euclidean distance, and that the length of the shortest error event path plays a lesser role
Keywords :
fading; telecommunication channels; trellis codes; Rician fading channel; TCM; branch distance; error performance; fading factor; free Euclidean distance; interleaving/deinterleaving; optimum code design; shortest error event path length; simulation; trellis coded modulation; Additive white noise; Bandwidth; Convolutional codes; Decoding; Fading; Interleaved codes; Performance analysis; Rayleigh channels; Rician channels; Signal design;
Conference_Titel :
TENCON '92. ''Technology Enabling Tomorrow : Computers, Communications and Automation towards the 21st Century.' 1992 IEEE Region 10 International Conference.
Conference_Location :
Melbourne, Vic.
Print_ISBN :
0-7803-0849-2
DOI :
10.1109/TENCON.1992.271963
