00000ctm a22000004a 4500 UP-99796217602381505 Buklod 20230503092542.0 m |o d | ta 080209s1998 xx r |||| u|eng d (iLib)UPD-00000125534 DML eng DMLUC LG 995 1998 E6 A57 Antonio, Mia G. A comparative study of symmetric and asymmetric 4-, 8- and 16- state trellis coded 8PSK modulation Mia G. Antonio. 1998. xii, 155 leaves ill. + 1 computer disk Computer print-out. Thesis (M.S.)--University of the Philippines, Diliman. This thesis consists of the modelling simulation and evaluation of symmetric and asymmetric 4-, 8- and 16-state trellis coded 8-ary phase shift keying (8PSK) modulation techniques in a channel corrupted by noise and amplitude fading, modeled by additive white Gaussian noise (AWGN) and Rayleigh fading respectively. The different trellis coded modulation (TCM) systems and channels were modeled and verified through simulation using MATLAB. Performance evaluation was based on the resulting symbol and bit error rates. For each of the 4-, 8- and 16-state trellis coded 8PSK system, the error rates for different values of signal-to-noise ratio (SNR) were determined and plotted. The best system was the one with the smallest value of symbol or bit error rate. Results of this thesis showed that the symmetric 8PSK signal constellation was better than its asymmetric counterparts in a noisy fading channel for the 4-, 8- and 16-state trellis coded 8PSK modulation schemes. Results also showed that the error rate of asymmetric schemes decreased as the asymmetry angle approached the symmetric case. Telecommunication systems. Digital communications. Error-correcting codes (Information theory) Modulators (Electronics) Radio Transmitters and transmission. Thesis FI UP UPD DARCHIVES LG 995 1998 E6 A57 UPD DENG-II LG 995 1998 E6 A57 Thesis