Novel M-ary coded modulation scheme based on constellation subset selection

In this paper, a novel adaptive coded-modulation scheme, namely M-ary coded modulation, which is spectrally-efficient and can facilitate variable data-rates, is proposed to meet different quality-of-service (QoS) requirements for wireless multimedia applications. An efficient constellation subset selection algorithm incorporated with a novel M-ary coding technique is proposed to generate convolutional codes for different constellation subsets. The studies on the theoretical and practical aspects of our proposed adaptive coded-modulation scheme are presented. Compared with other existing adaptive coded-modulation methods, our scheme offers more flexibilities. According to Monte Carlo simulation results, our new M-ary coded-modulation scheme not only can satisfy the predetermined symbol-error-rate (SER) requirement, but also can significantly enhance the communication quality in terms of bit error rate and throughput.