• Raj Kumar Goswami
• G Sasibhushana Rao

In designing of any digital communication system, coding and modulation are generally treated as two independent functions. The role of modulator and demodulator is restricted primarily to convert an analog waveform channel to a discrete channel and the role of encoder and decoder is to correct the errors those occurred in this discrete channel. To achieve the higher performance, code rate is lowered and the redundancy in the code increased at the cost of bandwidth expansion. This code can be integrated with the expanded bandwidth efficient signal set so as to utilize the redundancy resulted from such an expansion in order to avoid bandwidth expansion. The convolutional code when integrated with a bandwidth efficient modulation scheme is termed as Trellis Coded Modulation (TCM) [1]. In constructing conventional TCM for fading channels the effective length of the code is increased by increasing the number of encoder states and preventing parallel transitions. In this paper we examine an alternate approach for increasing the effective length of the code by assigning more than one symbol per trellis branch. This technique, proposed by Simon and Divsalar [2], is referred to as multiple trellis coded modulation (MTCM). Finally the performance of both the scheme is compared.

PERFORMANCE ANALYSIS SINGLE TCM SCHEME WITH MULTI-TCM SCHEME (MULTIPLICITY FACTOR 2) FOR RAYLEIGH CHANNELS

"PERFORMANCE ANALYSIS SINGLE TCM SCHEME WITH MULTI-TCM SCHEME (MULTIPLICITY FACTOR 2) FOR RAYLEIGH CHANNELS", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 2, page no.492-495, February-2019, Available :http://www.jetir.org/papers/JETIR1902F46.pdf

"PERFORMANCE ANALYSIS SINGLE TCM SCHEME WITH MULTI-TCM SCHEME (MULTIPLICITY FACTOR 2) FOR RAYLEIGH CHANNELS", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 2, page no. pp492-495, February-2019, Available at : http://www.jetir.org/papers/JETIR1902F46.pdf