基站天线的优化选择和设置技术

阐述了天线对移动通信系统网络性能的重要性,介绍了目前国内移动通信系统中常见天线种类和性能指标,并结合工程实践,分析了天线选择设置不当对网络性能的影响,给出了移动通信系统天线使用的几种典型环境下,基站天线优化选择和设置的注意事项和方法。     

A Blind Adaptive QR-Based Lattice Multi-Channel Filter for Cellular Base-Station TDMA Transceivers with Antenna Arrays

A new adaptive algorithm for blind interference rejection and multipath mitigation is studied and applied to antenna array processing in TDMA cellular communication systems. It is shown how the estimation of multiple signals from different sources by means of a multi-sensor receiver can be formulated as a multi-channel deconvolution problem. The proposed method is based on High-Order Statistics (HOS) processing of the baseband vector samples at the antenna array output. The similarity between the cumulant-based solution and the standard multi-variable Least Squares solution is exploited to derive an efficient adaptive algorithm based on the vector lattice architecture. The algorithm is numerically stable, considerably less complex than other existing multi-channel methods using HOS processing and exhibits rapid convergence with respect to blind array processing algorithms using simple gradient-based minimization procedures.     

一种适用于LTE 基站的宽频带双极化印刷偶极子天线

提出了一种适用于LTE 移动通信基站系统的低成本双极化偶极子基站天线辐射单元,天线采用0.8 mm板厚的FR4基板双层印制工艺。利用微带线垂直和折叠结构的辐射臂设计,有效地扩展了天线工作带宽,减小了天线物理尺寸。将两个偶极子单元垂直交叉构成±45°双极化天线。测试结果显示天线电压驻波比VSWR 小于1.5 的相对阻抗带宽为52.9%(1.705 ~2.93 GHz),隔离度大于19 dB,天线平均增益为8.67 dBi,半功率波束宽度为67°±8°。测试与仿真吻合较好,可应用于移动通信基站。     

蜂窝系统中分布式空域基站协作的仿真研究

对分布式空域基站协作进行了分析仿真,重点对两小区场景和三小区场景采用最大化层虚拟信干噪比算法的预编码技术进行了仿真验证,并与采用最大化虚拟信干噪比算法的预编码技术进行了比对。仿真结果表明通过分布式的基站协作预编码算法,可以有效地抑制小区间干扰,提高系统的性能;结果还表明层虚拟信干噪比算法比虚拟信干噪比算法有更好的性能,增加天线数量也可以提高系统的性能。     

四线式宽频带短波基站天线及其性能分析

提出一种新型四线宽频带短波基站天线,该天线采用模拟加粗、末端加载和行波工作相结合的方案,有效地扩展了工作频段。对天线进行了仿真分析和实际测试,该天线在2~30MHz频带范围内满足电压驻波比小于2.0,相对增益可达3~5dBi,比普通宽带短波基站天线工作频带宽、辐射效率高。而且对应于不同的工作频段,该天线可以满足远、近不同通信距离的需要。     

移动通信系统中的智能天线技术

文章简述了智能天线的概念、原理和分类,包括预多波束和自适应波束两种智能天线的原理和算法,论述了智能天线技术对移动通信系统性能的影响。     

Design of a Microstrip Antenna Setup for Bio-Experiments on Exposure to High-Frequency Electromagnetic Field

The aim of this work is to design an innovative exposure system that enables accurate reproduction of various high-frequency exposure environments for the experiments. Attention is given to the solution of the general problem concerning the design of an antenna system, given a set of constraints on the field components profiles. Special reference is made to the replication of the field distribution due to radio base (RB) stations for mobile communications, but the procedure may be applied to other sources as well, without significant modifications. The sources adopted for this purpose are microstrip antennas. The field profiles obtained by means of the realized source system have been measured and compared favorably with the design specifications. The root means square (rms) value and the polarization and spatial variations are replicated     

Power Allocation and Antenna Selection for Heterogeneous Cellular Networks

In this paper, we investigate the system performance of a heterogeneous cellular network consisting of a macro cell and a small cell, where each cell has one user and one base station with multiple antennas. The macro base station(MBS) and the small base station(SBS) transmit their confidential messages to the macro user(MU) and the small user(SU) over their shared spectrum respectively. To enhance the system sum rate(SSR) of MBS-MU and SBS-SU transmission, we propose joint antenna selection com...     

蜂窝通信系统中天线选择在虚拟MIMO的应用

天线选择技术(AS)和虚拟MIMO(Virtual MIMO,VMIMO)技术都被广泛应用于只有一个无线射频(RF)模块的上行通信传输中。为了使两者的优势都得以发挥,该文提出将天线选择技术应用在虚拟MIMO系统中,该文中称作VMIMO-AS系统。然而,仅从被调度用户设备(User Equipment,UE)中选择最好的天线组成虚拟MIMO并不能确保系统获得最佳的性能。该文提出了VMIMO-AS系统中几种不同用户设备配对算法,并对这些算法就吞吐量性能和用户间公平度进行了比较。仿真结果表明第1个用户的选择需要应用AS原则,而考虑到复杂度和性能的折中,配对用户的选择则不需要应用AS原则。     

天线阵CDMA蜂窝无线通信系统的空时处理

本文围绕天线阵ＣＤＭＡ蜂容无线通信系统,简介了无线信道、单时间与单空间处理的特点,综述了空时自理即矢量均衡技术,包括系统模型与空时过取样信号的结构特性以基于某些优化准则和结构特性的空时处理方法,论证了将空时处理嵌入ＩＭＴ－２０００的可行性。     

16单元蜂窝移动通信双频基站天线设计

设计了一种工作在900MHz和1800MHz的16单元的蜂窝移动通信双频基站天线。针对我国移动通信频率,以基站天线的双频工作以及阵列波束赋形为目标,设计了一种满足基站天线双频辐射要求的最佳反射板形状,并通过PSO全局优化算法优化各单元馈电相位并调整其间距以实现垂直面方向图双频波束赋形的目的(即垂直面方向图在所覆盖的服务区域内具有余割波束)。该天线的水平面3dB波瓣宽度达到120,°各单元间耦合较小,并具有在驻波小于2时覆盖我国现行使用的GSM和CDMA系统,2.4GHzWLAN系统以及第三代移动通信系统的工作频段。     

智能天线对CDMA蜂房系统容量的影响

在移动通信系统中,采用智能天线可以通过降低系统信噪比(SIR)来提高容量.基于CDMA蜂房小区系统的容量分析,讨论智能天线对系统容量的影响.     

3G和4G蜂窝系统智能天线测试

3G是ITU关于第三代移动通信技术的规范,在广域覆盖时能保证速率达到384kbit/s,局域覆盖时速率达到2Mbit/s。3G将像GSM,TDMA和CDMA一样在无线接口上工作,并同时提供声音和数据服务。为了满足3G带宽的需要,特别开发了新EDGE接口。第四代(4G)无线技术将提供和办公用LAN(officeLAN)或家用线缆调制解调器差不多的数据传输速度,将是新兴3G服务的良好补充。4G的实现有几种可能的方法,从开发一个与所预期的3G系统紧密集成的高速系统到开发一个全新的高速分组数据系统(high-speed packetdata system)。智能天线技术,如多端输入-多端输出…     

基站蓄电池差异化维护的必要性

蓄电池的使用寿命和实际容量与温度、均浮充电压等因素密切相关。文中着重分析了影响基站蓄电池使用寿命的主要原因,阐述了如何对基站阀控式蓄电池进行精细化管理延长蓄电池使用寿命,重点对直流中高频开关电源以及蓄电池组的使用配置、维护以及检测等精细化管理相关问题进行探讨。     

浅谈基站的防雷整改措施

基站频繁的被雷击,不仅造成设备的损坏及话务量的流失,使运营商遭受巨大损失,而且也导致了用户满意度的下降.因此,分析了基站遭受雷击的原因,并探讨了浙江移动绍兴分公司2009年基站防雷的整改措施及效果.     

A 2–40 GHz Probe Station Based Setup for On-Wafer Antenna Measurements

A probe station based setup for on-wafer antenna measurements is presented. The setup allows for measurement of return loss and radiation patterns of an on-wafer antenna-hence-forth referred to as the antenna under test (AUT), radiating at broadside and fed through a coplanar waveguide (CPW). It eliminates the need for wafer dicing and custom-built test fixtures with coaxial connectors or waveguide flanges by contacting the AUT with a coplanar microwave probe. In addition, the AUT is probed exactly where it will be connected to a transceiver IC later on, obviating de-embedding of the measured data. Sources of measurement errors are related to calibration, insufficient dynamic range, misalignment, forward scattering from nearby objects, and vibrations. The performance of the setup is demonstrated from 2 to 40 GHz through measurement of an on-wafer electrically small slot antenna (lambda₀/35 times lambda₀/35,3.5 times 3.5 mm²) radiating at 2.45 GHz and an aperture coupled microstrip antenna (2.4 times 1.7 mm²) radiating at 38 GHz.     

一种抗可见光蜂窝网小区间干扰的光学发射天线设计

本文提出了一种应用于可见光蜂窝网的自由曲面光学发射天线,用于改善整个网络范围内的信号质量以提高系统的通信性能.首先基于能量映射关系和斯涅尔定律,设计了目标光分布区域为矩形的基于自由曲面透镜的光学发射天线,应用该天线能使半导体发光二极管(LED)光源发出的光信号均匀分布在0.8 m×0.8 m的正方形范围内.而后将设计的光学发射天线应用于可见光蜂窝网,并进一步对网络接收区域的光信号质量和系统性能做了分析.结果表明,在一个3m×3m×3m房间中安装有16个LED光源作为接入点,采用所设计的自由曲面光学发射天线,网络覆盖区域的光信号分布均匀度达到了0.8以上,同信道干扰基本消除,平均信干噪比为12.6 dB,系统具有较好的误码率性能,能够有效地保证可见光蜂窝网的通信质量.     

The Development of a Cellular Phone Antenna with Small Irradiation of Human-Organism Tissues

The method put forward here is to reduce undesirable irradiation using an auxiliary radiator of low power. Calculations show that an arrangement with an additional radiator reduces irradiation by a factor of three to four. The structure and magnitude of the field in the far zone preserve their quality of communication with the correspondents (base stations) in all directions.     

一种用于生命探测雷达的超宽带天线

该文设计了一种用于生命探测雷达的超宽带低背腔平面天线。该天线由一对半椭圆形天线臂组成,采用紧凑的1:2不平衡到平衡传输线变压器实现馈电。由于生命探测雷达工作在脉冲体制下,因而要求天线具有较大的带宽和良好的时域特性来保证信号不失真。为了消除天线臂截断效应引起的反射,采用半圆槽对天线臂末端进行锐化,增强了天线臂上残余电流的集中,同时采用电阻加载技术提高对反射电流的吸收能力。仿真和实验测量结果表明,所设计的天线具有良好的时域特性,能够满足生命探测雷达系统整机的开发和设计要求。