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DVB-T2与E-MBMS是分别由广电界与电信界提出的两种主流数字电视无线传输技术。这两种技术在信道传输关键技术上有很多相似之处,如都采用了OFDM调制方式、多天线、单频网技术等。通过分析比较,DVB-T2与E-MBMS各有优劣势,DVB-T2适合于广播电视等大数据量的视频业务大规模下行分发,E-MBMS适合于既有视频等业务需求又有双向交互需求的小规模用户。 相似文献
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在研究3G LTE E-MBMS技术的基础上,提出一种利用E-MBMS作为城市动态交通信息大范围发布平台的技术方案,分析了E-MBMS的技术优势,并针对接收端的分组数据丢失问题,研究了重播方法进行数据恢复的性能。仿真实验结果表明,E-MBMS中以喷泉码前向纠错算法为核心的应用层FLUTE协议具有较好的数据纠错能力,运算量小,信道资源利用率高,适用于单向无线信道无误码率的数据下载与传输业务。本文所提方案具备成本低、可行性强的优点,能够满足城市智能交通系统对大范围动态交通信息发布的技术需求。 相似文献
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The difference in link condition of broadcast/ multicast users and the limitation of uplink resource, make it difficult to utilize adaptive modulation and coding (AMC) in the enhanced multimedia broadcast and multicast service (E-MBMS) network. To obtain the improvement of system throughput, this study proposes an adaptive modulation and coding scheme based on partial feedback, by which only partial users whose channel qualities are lower than the system threshold need to make a response to the modulation coding scheme (MCS) adaptation procedure. By this investigation, an adaptive scheme can be introduced in the E-MBMS network. Both the theoretical analysis and simulation results demonstrate the efficiency of the proposed strategy, in which the performance is close to the ideal one and has a significant throughput improvement when compared with that of the fixed MCS transmission scheme. 相似文献
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