Then we investigate the application of acm in hsdpa and the complexity of the equipment using acm in hsdpa . the simulation results show that adaptive coded modulation technique is an efficiency methods to provide a high spectral efficiency , combined with h - arq , it can maintain an acceptable transmission quality and make a good advantage of 仿真结果表明,自适应编码调制技术是一种可以有效提高平均频谱利用率的技术,与h - arq等技术相结合可以保证一定的传输质量,同时有效利用有限的频谱资源,在未来的移动通信系统中将发挥重要的作用。
In this paper , research on such video error recovery and concealment techniques as decoder - side error concealment ( ec ) and feedback - based retransmission without waiting ( nwarq ) is carried out based on the test modal reference software jm1 . 4 of the developing iso / iec mpeg and itu - t vceg video coding standard jvt ( joint video team ) 本论文以新一代视频压缩标准jvt ( jointvideoteam )测试模型jm1 . 4为基础，重点研究了视频差错恢复和掩盖技术，其中包括解码器端差错掩盖技术和基于编码器解码器交互的无等待arq技术。
High speed uplink packet access ( hsupa ) is a new work item of technical specification release 6 in 3gpp . wcdma system . the techniques of this work item , i . e . node b controlled scheduling , hybrid arq with chase combining , shorter tti , are to improve the performance of uplink dedicated transport channels , i . e . to increase capacity and throughput and reduce delay 在hsupa中通过采用基站nodeb控制调度、结合了软合并的混合自动重传请求( harq ) 、更短的传输时间间隔( tti )等关键技术,不但增强了系统容量与覆盖还使用户设备( ue )能获得更大的上行吞吐、更小的传输延时。
It is composed of three mian protocols : call synchronization protocol , control frame transmission protocol based on arq mechanism and data transmisstion protocol based on slot precontract mechanism . one scan channel table is shared in the hfmanet . the nodes in the same dwell group work in the same scan channel , and the nodes in the different dwell group work in the different scan channel 该协议的网络拓扑结构采用分布式分群结构,协议不同于传统的短波点到点及需要中心节点转发的组网方式,而是初步实现了短波电台之间多跳组网功能,其协议内容主要包括同步呼叫协议、基于arq的控制帧传输协议和基于虚电路及时隙预约方式的数据帧传输协议。
