In this chapter, a new Hybrid Multilevel Modulation (HML) technique using Trellis based Spatial Modulation (SM-TC) scheme and Space Time Trellis Coding (STTC) scheme as component code is analyzed which exploits the advantage of both in an optimal way. In this method, antenna grouping technique is used and the group is selected based on the Trellis based spatial modulation (SMTC) (Basar et al 2011a). Using this technique, MIMO system can be designed with any number of transmit antennas. The system is analyzed with optimal Viterbi decoding and suboptimal sequential decoding algorithm and compared with equivalent MLSTTC and MLSM schemes. Further, the performance of the HML system is analyzed with branch metric computation based on Maximum Likelihood (ML) criteria and Multi Resolution Modulation (MRM) technique. The HML system using low complex branch metric calculations based on the MRM scheme with sequential decoding gives improved performance compared to equivalent MLSTTC over fast flat fading uncorrelated channel conditions with 12.5% reduced computations.
Dr. K. Kavitha
Department of Electronics and Communication Engineering, Kumaraguru College of Technology, Coimbatore, India.
Dr. H. Mangalam
Department of Electronics and Communication Engineering, Sri Ramakrishna Institute of Technology, Coimbatore, India.
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