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<p>Trellis-coded modulation (TCM) is a technique where forward error correction  coding and modulation are treated in a single operation without increasing the channel  bandwidth. In this thesis the performance of a variable data rate TCM waveform  transmitted over a channel is investigated. In general, TCM systems with rate 1/2 and rate  2/3 convolutional codes and quadrature-shift keying (QPSK) and 8-phase-shift keying  (PSK) modulation, respectively, are considered. The data rate of the later TCM system is  50% faster than that of the former. Two cases are considered. In the first case, the number  of memory elements K remains constant as the code rate increases. In the second case,  the number of memory elements increases linearly with code rate, so that the total  number of memory elements for 8-PSK, r=2/3 TCM is given by 1/ 2 2 K K = , where 1/ 2 K  is the number of memory elements for the QPSK, r=1/2 convolutionally encoded TCM  system. The effects of pulse-noise interference (PNI) in addition to additive white  Gaussian noise (AWGN) are considered. It was found that both TCM systems have  significant resistance to PNI when K is large enough.
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<br>Subjects: Random noise theory; Ferroelectric storage cells</div>
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Katzourakis, Ioannis</div>
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