On the Performance of Code Word Diversity Based Quasi Orthogonal Space Time Block Codes in Multiple-input- multiple-Output Systems: A Recent Study

Many studies have been conducted in the recent past to design a Multiple Input-Multiple-Output (MIMO) system to provide multimedia services with higher quality and at a higher data rate. It supports high-speed applications without requiring additional communication resources such as power and bandwidth. In accordance with these requirements, this paper proposes a novel Quasi Orthogonal Space Time Block Code (QOSTBC) scheme based on code word diversity, which is a multi-dimensional approach. The term code word diversity was coined because the information symbols were spread across many code words, in addition to traditional time and spatial spreading, without increasing transmission power or bandwidth. Because of the extra diversity provided by code words, the receiver with perfect channel state information estimates the transmitted symbols with less probability of error. When compared to conventional schemes, the simulation findings indicated a significant improved performance in the proposed scheme's Bit Error Rate (BER) performance.