We propose high rate coded M-ary quadrature amplitude modulation (MQAM) schemes. First, we study a matched mapping which is able to reduce the computational complexity of the Euclidean distances between signal points of MQAM. We search for rate R = 1/2 nonbinary convolutional codes for coded 64QAM and 256QAM by the matched mapping method. Next, we construct high rate punctured codes from the searched codes. Finally, the bit error probabilities of the proposed high rate coded modulation using the punctured codes for 64QAM and 256QAM are compared with the uncoded signal constellations and a conventional TCM code for AWGN and Rayleigh fading channels. The results show the proposed punctured coded modulation schemes are effective.
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