Abstract
Mobile and wireless technologies such as Wi-Fi, WiMAX, 3G, 4G/LTE and the emerging 5G require communication of high quality videos with the limited available bandwidth. H.264/AVC and High Efficiency Video Coding (HEVC) or H.265 multimedia standards are implemented in these technologies to fulfill this requirement. Moreover, these standards achieve high error performance over wireless channels and large compression efficiency thereby optimizing channel bandwidth. Multimedia standards employ multi-class bitstreams where unequal levels of importance are assigned to the multimedia content. Consequently, the multi-class bit streams employ Unequal Error Protection (UEP) techniques to achieve optimal redundancy as well as better multimedia error performance and coding gains over wireless channels.Recently, coded Multiple-Input Multiple-Output (MIMO) systems employing Orthogonal Space-Time Block Codes (OSTBCs) have been adopted in mobile and wireless networks with the aim of maximizing spatial diversity gain without sacrificing the channel bandwidth. The problem of establishing reliable wireless communication links with high spatial diversity and coding gains for recent and future networks is a big challenge for researchers. A thorough literature survey reveals that the transmission of HEVC multi-class coded data streams over wireless channels employing coded MIMO systems to achieve both spatial diversity and coding gains has not been explicitly explored. To this end we propose, in this paper, to evaluate the error performance of Multiple-Input Multiple-Output (MIMO) systems employing Orthogonal Space-Time Block Codes (OSTBC) and Hierarchical 4/MQAM Modulation to promote unequal error protection of the coded data. The approach adopted provides excellent unequal error protection capabilities through the hierarchically modulated symbol and both diversity as well as coding gains are achieved. The proposed MIMO systems are designed and implemented in MATLAB Simulink® 2017 and error performances are evaluated through simulations. Experimental results show at a Bit Error Probability (BEP) of 10−4 a coding gain of around 10 dB can be observed between the base and refinement sub-channels with the 2x2 Alamouti code.
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