International Journal of Computer Science and Intelligent Computing (IJCSIC)

We introduce a new family of space–time trellis codes that space–time block codes as building blocks in our new trellis codes. These codes combine set partitioning and a super set of space–time block codes in a systematic way to provide full diversity and improved coding gain.. It is also possible to maintain a tradeoff between coding gain and rate.. Simulation result (i.e. frame error rate) shows that the STTC in such environment (i.e. frequency selective) could not take full advantage of the multipath environment to increase coding advantage (i.e. shift of error rate curve) due to increase in parallel path of the decoding trellis. This paper investigates the performance of Space-time Trellis Code (STTC) designed primarily for non-frequency selective (i.e. flat) fading channel but now applied to a frequency selective fading channel. A new decoding trellis is proposed for the STTC in frequency selective fading environment. It was apparent that the number of state of the decoding trellis of the STTC in a frequency selective channel is a function of the number of divergent paths per state, the multipath ray and the original number of states of Simulation result (i.e. frame error rate) shows that the STTC in such environment (i.e. frequency selective) could not take full advantage of the multipath environment to increase coding advantage (i.e. shift of error rate curve) due to increase in parallel path of the decoding trellis. However the diversity order (i.e. slope of the error rate curve) performance is equivalent to that obtained in flat fading channel.