| Trellis-coded Modulation (TCM) is one of the key coded modulation techniques used in digital communications. It combines convolutional coding with that of certain modulation techniques such as 8-PSK, 4-QAM and 16-QAM to achieve significant coding gains over the un-coded transmission without increasing the bandwidth. In Non-coherent Coded Modulation (NCM) the receiver makes no assumption about the carrier, eventually reducing the receiver's complexity in terms of additional hardware requirements, in contrast with that of Coherent coded Modulation such as TCM.; The use of different base-band signals when applied to TCM and the NCM systems were introduced in this thesis. The performance of the TCM and NCM system using the new techniques is simulated over the additive white Gaussian noise channel (AWGN) to measure the Bit error rate. In this study several novel techniques such as the use of pulse shaping with multiple timing samples and the concept of using multiple signal constellations were introduced.; Considerable improvement in performance is obtained, when the multiple pulse shaping and the sampling techniques introduced in this research, are used with the TCM and the NCM systems. |
