GSM 900/DCS 1 800双频网话务吸收

文章详细描述了MOTOROLA系统的双频参数设置，介绍了双频优化实际工作中的一些体会，并对评估双频网络的指标统计作了详细说明。     

GSM900/DCS1800双频网优化探讨

本文重点分析了当前双频网组网中应该注意的一些问题,并且对于双频网的优化进行了一定的分析.     

GSM900/DCS1800双频网组网方案的探讨

GSM900/DCS1800双频网具有许多共同点,组建双频网具备可能性。但GSM900与DCS1800也具有许多不同点,考虑的角度不同便有不同的组网方案。文中在分析建设双频网必要性及实现原理的基础上,依次给出了独立组网,共用MSC（不共用BSC）,共用BSC,共用BTS,共用HLR/AUC、EIR、OMC和SMC五种不同的双频网组网方案,并给出了每种方案各自的特点、优点、缺点,最后通过对五种方案的比较分析给出了各自的适用场景。     

Teletraffic performance of GSM900/DCS1800 in street microcells

Studies the teletraffic issues of the Global System of Mobile Communications at 900 MHz (GSM900), and its sister, the Digital Communication System at 1800 MHz (DCS1800). The teletraffic simulations have the essential elements of GSM900 and DCS1800, but they are not be exact simulations of these two systems. The approach is to site microcellular base stations, using the microcellular prediction tool MIDAS, into a fictitious city and into parts of two real cities. The radio coverage plots are then imported into a teletraffic simulator TELSIM. The simulator is loaded with the basic GSM900 and DCS1800 parameters to give an indication of the teletraffic performance of these systems in the three environments     

中兴GSM900/DCS1800数字蜂窝通信系统概述

１引言随着经济的增长，移动通信的用户需求极为旺盛，模拟通信已不能满足通信容量的迅猛增长，于是我国从１９９４年开始大规模建设ＧＳＭ数字移动网。据悉，到１９９８年５月１日，全国移动电话总数已突破１６００万，其中ＧＳＭ用户突破了１０００万。到２０００年，我...     

Triple-band CPW-fed compact monopole antennas for GSM/PCS/DCS/WCDMA applications

A triple-band coplanar waveguide (CPW)-fed LI-shaped monopole antenna is proposed. The antenna is composed of an I-shaped monopole and a meandered L-shaped one. The dimensions of the design are 29 times 28 mm which are 0.077 lambda times 0.075 lambda in terms of the lowest operating frequency of 800 MHz. The antenna operation presents attractive characteristics, each monopole is independently optimised to the resonant frequency and the impedance bandwidth without affecting those of other bands. The antenna shows improved radiation efficiency of individual monopoles for a global system for mobile communication, personal communication systems, digital communication systems, and wireless code division multiple access applications.     

A GSM/EGSM/DCS/PCS direct conversion receiver with integrated synthesizer

A global system for mobile communications direct conversion receiver with an integrated synthesizer is implemented with a 0.35-mum BiCMOS technology. Proposed second-order intercept point calibration method is analyzed and verified by measurements. The maximum IIP2=66 dBm is achieved by an 8-b resistive calibration code. The receiver draws 57/63 mA from a 2.7-V supply     

GSM900/DCS1800双频段基站测试系统的硬件设计

为了进行基站的灵敏度测试,对移动通信系统运营进行维护,该项目实现了GSM900和DCS1800双频段便携式基站测试系统的设计。基站测试系统硬件由信号处理与控制单元、GSM板卡和笔记本电脑组成。利用此系统可以实现GSM基站接收机静态灵敏度准确度≤±3 dB、测试距离≤1 000 m(视距,LOS)、测试时间≤10 s等,同时该系统支持2个以上GSM模块或者具有自环回的单个GSM模块的灵敏度测试。     

A single-chip quad-band (850/900/1800/1900 MHz) direct conversion GSM/GPRS RF transceiver with integrated VCOs and fractional-n synthesizer

Recent trends in the integration of entire systems on-chip have spurred the development of homodyne radios as alternatives to the more mature yet harder to integrate superheterodyne architectures. This paper presents a monolithic device that integrates all of the functions necessary to implement a multiband homodyne global system for mobile telecommunications (GSM) radio except for the power amplifier (PA) and radio frequency (RF) passives. The single BiCMOS chip includes a quad-band direct conversion receiver that down converts RF to quadrature analog baseband. The front-end circuitry is followed by a low-DC-offset, high-dynamic-range, analog I/Q baseband chain. The transmit section is comprised of a quad-band up-conversion transmit phase-locked loop (PLL) including on chip transmit voltage-controlled oscillators (VCOs). The stringent GSM receive band phase noise specifications are met without the use of surface acoustic wave filters. A single /spl Sigma//spl Delta/ fractional-N synthesizer locking a fully integrated ultrahigh frequency VCO generates the system local oscillator signal.     

GSM900/1800双频无线网络参数及其调整

本文在介绍ＧＳＭ９００／１８００无线传播特性和组网原则的基础上，阐述了对无线网络性能影响较大的双频无线网络参数的含义和调整原理。     

GSM 900／1800双频网组网方式和GSM 1800基站覆盖方式

比较了GSM900／1800双频网的不同组网方式，提出了选择组网方式时应考虑的重要因素，并讨论了3种GSM1800基站的覆盖方式及其特点。     

高效低成本的硅双极GSM双频PA模块

提出了在单个陶瓷基底上利用硅射频Ic双极芯片技术设计PA模块的方法和测试数据.得到的数据表明利用硅技术生产出的产品性能可与现有GaAs技术产品相媲美.     

GSM900/1800双频网建设和组网

随着GSM用户数量和话务总量的快速增加，以及话务分布呈现的极度不均匀性，在900MHz频段基础上引入1800MHz频段在许多城市和地区已成为必然。准确把握建设时机，明确建设的基本原则以及采取科学合理的组网方式至关重要。     

GSM900与WCDMA共站址互干扰问题

目前GSM900系统与3G（WCDMA）系统的共站互干扰问题是3G网络建设的一个关键问题。通过理论计算,对干扰问题进行了分析,同时对解决干扰问题给出了指导性意见。     

A 3 to 5 GHz low-phase-noise fractional-N frequency synthesizer with adaptive frequency calibration for GSM/PCS/DCS/WCDMA transceivers

正A low-phase-noise S-A fractional-TV frequency synthesizer for GSM/PCS/DCS/WCDMA transceivers is presented.The voltage controlled oscillator is designed with a modified digital controlled capacitor array to extend the tuning range and minimize phase noise.A high-resolution adaptive frequency calibration technique is introduced to automatically choose frequency bands and increase phase-noise immunity.A prototype is implemented in 0.13μm CMOS technology.The experimental results show that the designed 1.2 V wideband frequency synthesizer is locked from 3.05 to 5.17 GHz within 30μs,which covers all five required frequency bands.The measured in-band phase noise are -89,-95.5 and -101 dBc/Hz for 3.8 GHz,2 GHz and 948 MHz carriers,respectively, and accordingly the out-of-band phase noise are -121,-123 and -132 dBc/Hz at 1 MHz offset,which meet the phase-noise-mask requirements of the above-mentioned standards.     

Printed antennas for dual-band GSM/DCS 1800 mobile handsets

The recent developments of dual-band dual-mode D-AMPS/AMPS mobile handsets and radiostations has increased pressure on GSM service providers to follow similar technology breakthroughs as a first step towards IMT2000. A frequency-agile device accommodating both GSM standard frequency bands would serve more than 25 million GSM subscribers, with expectations as high as 100 million subscribers by the year 2000. Novel dual-band printed bow-tie antenna elements developed for dual-mode GSM/DCS 1800 handsets are described     

不同位置区GSM900/1800话务分担的调整

在目前的中国移动通信GSM网上 ,已引入了GSM180 0系统与GSM90 0系统共同组网。因此用优化的手段合理地分配两个不同频段的话务 ,显得非常重要。为了解决边界上因双频段话务分担不合理而导致移动台非正常漫游的现象 ,这里提出了一种小区偏置重选 (CRO)差值算法 ,并在实际GSM双频系统中得到了运用     

GSM 900/1800双频系统及其组网考虑

本文介绍了ＧＳＭ９００／１８００双频系统的基本特点和系统性能、初步分析，讨论了ＧＳＭ９００／１８００双频系统的组网方案以及需注意的问题。     

A single-chip 900 MHz CMOS receiver front-end with a highperformance low-IF topology

An analog receiver front end chip realized in a 0.7 μm CMOS technology is presented. It uses a new, high performance, downconverter topology, called double quadrature downconverter, that achieves a phase accuracy of less than 0.3° in a large passband around 900 MHz, without requiring any external component or any tuning or trimming. A high performance low-IF receiver topology is developed with this double quadrature downconverter. The proposed low-IF receiver combines the advantages of both the classical IF receiver and the zero IF receiver: an excellent performance and a very high degree of integration. In this way, it becomes possible to realize a true fully integrated receiver front-end that does not require a single external component and which is, different from the zero-IF receiver, nonetheless totally insensitive to parasitic baseband signals and self-mixing products     

WCDMA和GSM1800宏蜂窝共基站干扰分析

本文根据GSM1800和WCDMA协议,通过计算机仿真和确定性计算方法,重点对WCDMA系统与GSM1800系统在基站共站情况下进行干扰分析.