Trellis coded modulation is a technique in which coding and modulation are done jointly unlike earlier uncoded modulation in which coding and modulation were done separately and hence TCM gives more coding gain without escalating the signal bandwidth required.TCM uses set portioning based signal labeling to achieve a high free Euclidian distance. However decoding and demodulation are complex process in Trellis coded modulation. Bit interleaved coded modulation (BICM) reduced the decoding complexity of TCM by incorporating random interleavers to the coded scheme. BICM combines convolution codes with bit interlavers. Then BICM is modified for iterative decoding and demodulation and this modified BICM technique is known as BICM-ID. This scheme uses signal portioning as in TCM but enhances the BICM free Euclidian distance space. so better utilization of bandwidth with less complexity can be achieved with above defined schemes. In this research work a comparison of coded modulation schemes (TCM, BICM, BICM-ID) is done for finding better BER performance. According to results iterative bit interleavers are better choice than other two.

BICM, TCM, BICM-ID, AWGN, BER, SNR

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