The key parameters of 5G communication technology includes high data rate and latency to support Internet of Things (IoTs) in future. There are many ways to boost up system capacity of 5G systems. In this work, design of an efficient space time block code (STBC) is presented based on maximum rank distance (MRD) codes that give enhanced system capacity in terms of diversity gain. The work also includes a comparative study of orthogonal STBC and all of its equivalent group codes including MRD for 2 transmit antennas and 1 receive antenna (2 × 1) STBCs. It is shown through simulation that MRD code and all other related coset codes can achieve full diversity gain for 2 × 1 scenario similar to what orthogonal codes can do. In addition, it is shown that orthogonal code generally outperforms all equivalent codes. A unique case is also discussed in which MRD code outperforms orthogonal STBC. Due to full diversity gain, these codes find their direct applications in 5G, Unmanned Aerial Vehicles (UAVs) used in sensor networks.
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