TY - JFULL AU - Sameru Sharma and Sanjay Sharma and Derick Engles PY - 2010/11/ TI - Bandwidth Efficient Diversity Scheme Using STTC Concatenated With STBC: MIMO Systems T2 - International Journal of Electronics and Communication Engineering SP - 1496 EP - 1501 VL - 4 SN - 1307-6892 UR - https://publications.waset.org/pdf/15235 PU - World Academy of Science, Engineering and Technology NX - Open Science Index 46, 2010 N2 - Multiple-input multiple-output (MIMO) systems are widely in use to improve quality, reliability of wireless transmission and increase the spectral efficiency. However in MIMO systems, multiple copies of data are received after experiencing various channel effects. The limitations on account of complexity due to number of antennas in case of conventional decoding techniques have been looked into. Accordingly we propose a modified sphere decoder (MSD-1) algorithm with lower complexity and give rise to system with high spectral efficiency. With the aim to increase signal diversity we apply rotated quadrature amplitude modulation (QAM) constellation in multi dimensional space. Finally, we propose a new architecture involving space time trellis code (STTC) concatenated with space time block code (STBC) using MSD-1 at the receiver for improving system performance. The system gains have been verified with channel state information (CSI) errors. ER -