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.

Wi-Fi，WiMAX，3G，4G / LTE和新兴的5G等移动和无线技术需要在有限的可用带宽下传输高质量的视频。在这些技术中实施了H.264 / AVC和高效视频编码（HEVC）或H.265多媒体标准来满足这一要求。而且，这些标准在无线信道上实现了很高的错误性能，并且压缩效率很高，从而优化了信道带宽。多媒体标准采用了多类比特流，其中将不相等的重要级别分配给了多媒体内容。因此，多类比特流采用了不等错误保护（UEP）技术来实现最佳冗余以及更好的多媒体错误性能和无线信道上的编码增益。

近来，已经在移动和无线网络中采用了采用正交空时分组码（OSTBC）的编码多输入多输出（MIMO）系统，其目的是在不牺牲信道带宽的情况下最大化空间分集增益。对于最近和将来的网络而言，建立具有高空间分集和编码增益的可靠无线通信链路的问题对于研究人员来说是一个巨大的挑战。详尽的文献调查表明，尚未明确探索在采用编码MIMO系统的无线信道上实现空间分集和编码增益的HEVC多类编码数据流的传输。为此，我们在本文中提出，评估使用正交空时分组码（OSTBC）和分层4 / MQAM调制的多输入多输出（MIMO）系统的错误性能，以促进对编码数据的不平等错误保护。所采用的方法通过分层调制符号提供了出色的不均等错误保护功能，并且实现了分集和编码增益。拟议的MIMO系统在MATLABSimulink®2017中设计和实现，并且通过仿真评估错误性能。实验结果表明误码率（BEP）为10 拟议的MIMO系统在MATLABSimulink®2017中设计和实现，并且通过仿真评估错误性能。实验结果表明，误码率（BEP）为10 拟议的MIMO系统在MATLABSimulink®2017中设计和实现，并且通过仿真评估错误性能。实验结果表明，误码率（BEP）为10⁻⁴使用2x2 Alamouti码可以在基本和精炼子信道之间观察到大约10 dB的编码增益。