CDMA2000 1xEV-DO无线网络分组数据传输差错控制技术研究

CDMA2000发展到1xEV-DO和1xEV-DV,对于数据帧的无误码接收和有效的差错重传控制有着越来越高的要求.1xEV-DO通过空中接口协议为无线网络的分组传输提供了可靠而有效的差错重传控制系统.EV-DO主要在物理层、应用层和MAC层中采用的差错控制技术不仅提供了良好的差错重传控制机制,同时提高了无线链路的数据吞吐量,更加符合EV-DO高速分组数据传输的要求.     

基于3G的H.264视频编码数据传输

论述了H.264视频编码数据在无线网络上的有效传输,综合运用了帧内更新,交织的前向纠错(FEC)和错误隐藏技术.实验表明,此方法在无线信道中传输视频编码数据效果良好.     

3G视频监控系统传输部分的设计

提出了一种基于3G网络传输的移动视频监控系统传输部分的设计方法,重点对系统传输部分的设计和实时传输的实现作了详细介绍.经测试,该传输部分在本视频监控系统中工作稳定并已得到良好应用.     

A Model for the Performance Evaluation of Packet Transmissions Using Type-II Hybrid ARQ over a Correlated Error Channel

Type-II Hybrid-ARQ (Type-II HARQ) has been shown, under certain circumstances, to increase the efficiency and reduce loss of data transmissions over a wireless channel. However, it is difficult to predict how it will perform when transmission symbol errors are correlated. We present a computationally efficient approach to the performance evaluation of packet transmissions over a wireless link employing Type-II HARQ error mitigation when the physical channel is subject to correlated transmission symbol errors. This provides a tool for static or online optimization of system parameters. We present numerical results for a wide range of channel statistics, illustrating the effect of bit error correlation, bit error rate, and block size on packet latency and loss rate.