通信局(站)电源系统雷电过电压保护器件配置的考虑

介绍了通信电源用雷电过电压保护器件的要求、各级雷电过电压保护器件作用，论述了通信局（站）电源系统雷电过电压保护器件配置的考虑。     

雷电过电压保护器件配置的考虑

介绍了通信电源用雷电过电压保护器件的要求、各级雷电过电压保护器件作用,论述了通信局（站）电源系统雷这电压保护器件配置的考虑。     

防雷用过电压保护器与压敏电阻器的性能及应用

简述电源系统和信号线系统的雷电感应过电压的防护理论，方法及各类防雷用过电压保护器，压敏电阻器的性能和结构特点。     

移动通信基站防雷与接地

本讨论移动通信基站防雷与接地施工技术要求，并探讨基站设备雷电过电压的主要来源和入侵途径，提出感应雷电位反击的综合防治方法的思路。     

基站组合电源模块与系统的过电压保护

针对基站通信电源系统过电压保护存在的问题,提出了雷电过电压、非雷电过电压综合保护的设计思想,该设计采用两级压敏电阻保护方式;电源模块采用过电压切断保护,可以提高过电压保护范围、避免过电压引起的电源模块烧毁,从而提高组合电源系统的可靠性。     

关于电涌保护器介绍

电涌保护器（Surge protection Device）是电子设备雷电防护中不可缺少的一种装置，过去常称为“避雷器”或“过电压保护器”英文简写为SPD。电涌保护器的作用是把窜入电力线、信号传输线的瞬时过电压限制在设备或系统所能承受的电压范围内，或将强大的雷电流泄流入地，保护被保护的设备或系统不受冲击而损坏。     

自动延时恢复的CATV线路防雷防过压保护器

本防雷防过电压保护器是一种能够自动延时恢复的防雷防过电压保护器。在雷电较弱、过电压较低时切断电源,避免在雷电很强时通电工作,在雷电彻底停止后接通电源。适用于对有线电视线路设备进行防雷、防过电压保护。     

浅谈输电线路雷电过电压及防护

通过对雷电过电压的产生以及危害的分析,综合各种因素,制定在输电线路中对雷电过电压的保护措施,提高线路耐雷水平,减少雷电过电压事故的发生,保证线路供电可靠性和稳定性。     

一起过电压保护器烧损事故的分析与预防措施的探讨简

过电压保护器是一种非常有效的电网系统防御雷电过电压保护装置,它的特性可以保证电网长期稳定运行。本文就某35kV变电所过电压保护器的损坏对过电压保护器损坏原因进行了全面的分析,并提出具体的预防措施,为电力系统过电压保护器的可靠运行提供了技术参考。     

几种接地保护模式与等电位体

通信机房（站）防雷的重要性不言而喻。造成通信系统受害的方式主要有雷击后的雷电高电位、大电流侵入、雷电感应。采用电磁屏蔽可以解决雷电感应过电压问题；配备三级浪涌保护器阻止大电流侵入机房；而雷击后的高电位需要有一个完好的等电位系统，一释放高压，二地电位整体上升。怎样真正做好地电位“整体上升”，笔者认为建立合理、恰当的等电位保护地线网连接模式，保证保护地连接线的截面积，作为一个完整的等电位系统甚为必要。     

BTS660及其在电池智能检测与充电装置中的应用

针对电池智能检测与充放电过程中要进行大电流功率转换的需求,提出了一种利用高精度大电流功率开关来进行电池充放电过程中的大电流功率转换方案。采用Infineon Technologies AG公司生产的BTS660作为大电流功率转换器件,并利用2片BTS660级联来实现充放电过程中的控制,同时重点介绍了其在电池智能检测与充电装置中的应用,并给出了应用电路。结果表明：该方案中的电路工作稳定．并可实现在电压大T70V时的过压保护及短路电流为90A的过流保护,对实现充放电过程中的大电流功率转换起到了良好的转换和保护作用。     

LTE/GSM多模基站收发信台数字中频模块故障诊断的新方法

针对LTE/GSM多模基站收发信台（BTS）开发中FPGA数字中频模块故障诊断的需求,开发 了一种基于以太网数据通信接口,利用Matlab软件直接存取FPGA内部寄存器值,并且可以连 续采集数字中频模块内部关键节点大块数据的软硬件协 处理方法,从而快速定位数字中频信号链路的调测问题并帮助排除故障。这种诊断方法无缝 集成在FPGA设计中,可以在BTS测试开发的各个阶段采用,不需要额外设备及接口。在LTE/G SM MSR（Multi-Standard Radio）项目中利用该诊断技术完成了数字中频模块上下行信号 处理链路频谱异常等故障的诊断与定位。     

WCDMA与其他系统共址时隔离度的计算

本文首先分析了不同系统间的主要干扰类型,并详细阐明了各种干扰的数学计算方法,然后提出了解决这些干扰的隔离要求,并阐明了理由,最后根据各种系统的规范要求对WCDMA与GsM、CDMA、PHS、TD-SCDMA相互之间的干扰情况进行了分析,得出了WCDMA与其他系统共址时所需的隔离度及天线隔离要求.     

双载频在WCDMA网中的应用

在3G网络部署和扩容过程中,经常使用多载波基站。基于基站的资源架构和多载波基站,可以快速实现3G网络的平滑扩容。因此,多载波基站成为3G移动通信网络扩容的主要实现方式之一。本文介绍了WCDMA中双（多）载频技术在一些场合中的应用和组网策略。     

High-performance DSPs

The processing delay is a serious constraint for speech communication. A one-way end-to-end delay of more than 150 ms can severely degrade the quality of real-time conversations. The components of the total system delay includes the speech frame size, the look ahead, other algorithmic delays, multiplexing delay, processing delay for computation, and transmission delay. At the transcoder rate adaptor unit (TRAU), the only delay that can be manipulated is the processing delay. The TRAUs are generally positioned remote to the base transceiver station (BTS). The channel codec units (CCUs) are located in the BTS. In general, 16 kbit/s traffic channels can be used for full rate speech between the TRAU and BTS. By putting the TRAU remote to the BTS, DSPs for speech coding can be utilized more efficiently to cut system cost. High performance DSPs, such as the Lucent DSP16000, can be used to further cut the cost per speech channel. This article presents an implementation of GSM enhanced full rate (EFR) codec on the Lucent Technologies' DSP16000. The original European Telecommunications Standards Institute (ETSI) C code has been restructured to address the issues of MIPS (million instructions per second), RAM usage, and processing delay. We give a performance overview of vocoder implementations on some existing fixed-point DSPs and discuss the architecture of the DSP16000. Details on how the ETSI C code is restructured are presented. The DSP16210 implementation results are then discussed     

SDH设备与GSM基站配合问题的理论和实验分析

本文分析了SDH设备用于GSM网络中时的基站时钟同步问题，给出了基站时钟失锁引起通信中断的解决方案。     

A new 94-GHz six-port collision-avoidance radar sensor

A new 94-GHz collision avoidance radar sensor is proposed. The receiver front-end module is based on a six-port phase/frequency discriminator (SPD). The SPD, composed of four 90/spl deg/ hybrid couplers, is manufactured in a metal block of brass using a computer numerically controlled milling machine. Simulation and measurement S-parameters of the SPD are presented in the frequency band. New SPD computer models are generated and used in the system simulations. Preliminary measurements and system simulations performed to obtain the relative velocity of the target and its distance are presented. Statistical evaluations show an acceptable measurement error of this radar sensor.     

Development of the Base Station Transceiver Subsystem in the CDMA Mobile System

The base station transceiver subsystem (BTS) of the CDMA Mobile System is interfaced to mobile stations over the air and to the wired network through a packet switched interconnection network. The potential benefits of CDMA technology are achieved when the transmitter and the receiver are properly designed and implemented. The physical layer of the air interface at the base station is implemented with the CDMA ASICs and control circuits in the channel card of the BTS. We present the design perspectives and structural illustration of the BTS. Base station modem ASICs and their control to implement the CDMA receiver, baseband and RF signal processing blocks, and BTS controller are described. Elaborate power control is essential to ensure the high capacity which is one of advantages of the CDMA technology. The closed loop reverse link power control and the forward link power control operated in the BTS are described.     

Re-Multiplexing ISDB-T BTS Into DVB TS for SFN

The Single Frequency Network (SFN) allows a single TV channel to cover a great area in the same frequency, increasing the spectrum efficiency and signal quality. In this case, all the programs are re-multiplexed into a Transport Stream (TS) and distributed to the re-transmitter stations. The Integrated Digital Services Broadcasting–Terrestrial (ISDB-T) has been projected to operate in SFN, and uses a TS-adapted version called Broadcast Transport Stream (BTS). The BTS has a constant bit rate and packet size of 204 bytes. Owing to these characteristics, most network adapters are non compliant with this signal type. This article proposes a new re-multiplexer algorithm of the BTS signal that allows the encapsulation of the BTS into the Digital Video Broadcasting Transport Stream (DVB TS) and vice versa. This technique makes the BTS distribution possible through satellite, allowing the large SFN construction and accomplishing lesser bit rate than the original BTS.      

Présentation d’une technique 3D d’accélération de la recherche de rayons application aux télécommunications microcellulaires

Development of telecommunications using mobile phones requires the installation of many base stations (BTS) in order to cover the large number of cells which make up the network. Existing systems (GSM, DSC) use carrier frequencies within the microwave range. Ideally, operators should have simulation software to determine the position of BTS. This software would be used initially to determine the geometric configuration of the cells. The next step would be to optimise the radiation pattern of each BTS antenna. In this article we present a method for determining radioelectric coverage based on image theory adapted to the problem, which is more accurate and less time-consuming than conventional methods.