基站

First, the stations'timing process and the slot aligning are discussed. Second, the dissertation propose a resource request random access method based on feedback. The performances of this method are analyzed. Third, proceed from the considerations of the MAC protocol for the HFC system, a QOS-oriental scheduling algorithm for the MAC protocol based on dynamic TDMA is proposed. Simulation results show that the performance of this algorithm is better than that of the first come first service. Forth, two contention resolution algorithms ----p-persistent CRA and tree CRA, which are usually adopted in the HFC system, are summarized. The delay and characteristic are compared. At last, the dissertation introduces the function implementation of the MAC layer based on COM21 UPSTREAMS.

首先，讨论了基站的同步进程和时隙同步的实现；然后，本文提出了一种带反馈模块的资源申请信号随机接入方法，并对其进行性能分析；然后，从HFC系统的MAC协议出发，提出了一种用于基于动态TDMA技术的MAC协议的业务安排算法，计算机仿真结果表明其性能优于先到先服务法的性能；然后概述了常用于HFC系统的两种冲突解决算法——p-坚持冲突解决算法和树型冲突解决算法，比较两者的时延性能与特征；最后，介绍了基于COM21 UPSTREAMS协议的MAC层功能实现，给出了硬件框图和照片。

Our focus is the commercial telecommunication and wireless technology industries, with extensive experience with a range of products including power dividers, phase shifters, striplings, patches, combiners, base station, GPS and satellite automotive antennas.

我们专注于商业通信和无线技术领域，在多个领域有着丰富的产品研发和生产经验，如：功分器、耦合器、相移器、微带天线、片状天线、基站，GPS和汽车卫星天线等。

The "sonobuoys" detect signals made by vessels and passes information to the basestation.

的&声纳浮标&检测信号所作的船只和传递信息的基站。

The distributed DCA scheme allocates channels according to the information available locally, so the reliability is better. But because the channels in the system can hardly be reused to form the optimum style, the capacity of the system is smaller than that when centralized DCA is engaged.

分布式动态信道分配方案由各基站根据本小区可获得的信息进行信道分配，它的可靠性较好，但由于信道在系统中难以按最佳的方式进行重用，所以它的系统容量比集中式动态信道分配方案要小。

In this way the users can finish all works outside with only one GPS receiver and will no longer need any basestation and to buy and mainatin any data processing software, or even understand the operation of such software.

在外业上，GPS使用者只需要操作一台接收仪不需要基站就可以完成所有的定位的工作。在内业方面，GPS使用者不再需要购买以及维护任何的资料处理软体，甚至不必了解软体的操作。

Power amplifiers are the core devices of the base stations and repeaters.

本文设计的系统完成并实现了基于MCUADuC7026 的基站功率放大器的本地实时监控系统，以及远程通信协议。

That means the base-station can be quickly rejigged to support different mobile-network technologies, or even several such technologies at the same time.

这意味着一个基站能重新编程从而支持不同的移动网络技术，甚至能同时支持几种不同的技术。

That means the base-station can be quickly rejigged to support different mobile-network technologies, or even several such technologies at the same time.

这意味着基站可以快速更改配置，以支持不同的移动网络技术，或同时支持几种移动网络技术。

And then I rebooted the phone's base station.

最后我重启了电话基站。

Upon receipt of a response from the base station during the reattempts, the mobile station performs power-off of the mobile station.

当在这些再尝试中未能从该基站接收到回答时，该移动站执行它的断电。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。