Division of Computer and Telecommunications Engineering, Yonsei University, Wonju, Gangwon-do, Republic of Korea.
PLoS One. 2019 Jan 15;14(1):e0210112. doi: 10.1371/journal.pone.0210112. eCollection 2019.
In this paper, a novel unequal error protection (UEP) technique is proposed for video streaming over multiple-input multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) systems. Based on the concept of hierarchical quadrature amplitude modulation (HQAM) UEP and multi-antenna UEP, the proposed technique combines the relative protection levels (PLs) of constellation symbols and the differentiated PLs of the transmit antennas. In the proposed technique, standard square quadrature amplitude modulation (QAM) constellations are used instead of HQAM so that the QAM mapper at the transmitter side and the soft decision calculation at the receiver side remain unchanged, but the UEP benefit of HQAM is retained. The superior performance of the proposed technique is explained by the improved connections between data with various priorities and data paths with various PLs. The assumed video compression method is H.264/AVC, which is known to be commercially successful. The IEEE802.16m system is adopted as a data transmission system. With the aid of realistic simulations in strict accordance with the standards of IEEE802.16m systems and H.264/AVC video compression systems, the proposed technique HQAM-multi-antenna UEP is shown to improve the video quality significantly for a given average bit error rate when compared with previous techniques.
本文提出了一种新的适用于多输入多输出正交频分复用（MIMO-OFDM）系统视频流的不等错误保护（UEP）技术。该技术基于分层正交幅度调制（HQAM）UEP 和多天线 UEP 的概念，将星座符号的相对保护级别（PL）和发射天线的差异化 PL 相结合。在该技术中，使用标准的方形正交幅度调制（QAM）星座代替 HQAM，因此发送端的 QAM 映射器和接收端的软判决计算保持不变，但保留了 HQAM 的 UEP 优势。通过改进具有不同优先级的数据与具有不同 PL 的数据路径之间的连接，解释了所提出技术的优越性能。所假设的视频压缩方法是 H.264/AVC，它被认为是商业上成功的。采用 IEEE802.16m 系统作为数据传输系统。借助严格符合 IEEE802.16m 系统和 H.264/AVC 视频压缩系统标准的现实模拟，与以前的技术相比，所提出的 HQAM-多天线 UEP 技术在给定平均误码率下显著提高了视频质量。
