themobiletechnology.org
移动技术 - 移动通信爱好者移动通信技术和发展。
http://www.themobiletechnology.org/
移动通信技术和发展。
http://www.themobiletechnology.org/
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移动技术 - 移动通信爱好者 | themobiletechnology.org Reviews
https://themobiletechnology.org
移动通信技术和发展。
themobiletechnology.org
移动通信原理 - 移动技术
http://www.themobiletechnology.org/yidongtongxinzhishi/yidongtongxin-yuanli.html
2)截至2007年12月底，我国固定电话用户达到3.65亿用户，移动电话用户数达5.47亿;固话普及率27.8部/百人，移动电话普及率41.6部/百人。
移动通信的频段划分 - 移动技术
http://www.themobiletechnology.org/yidongtongxinzhishi/yidongtongxin-de-pinduan-huafen.html
较早的移动通信主要使用甚高频VHF 150MHz 和特高频UHF 450MHz 频段。 美国摩托罗拉公司 MOTOROLA 向美国联邦通信委员会 FCC 提出申请AMPS系统 Advanced Mobile Phone Servlce的缩写 ，经批准于1983年投入商用。 英国决定采用AMPS系统的改进型,即TACS系统 Total access Communication systom的缩写。 我国邮电部于1983年11月以邮电字921号 转发 全国无委关于移动通信公众网使用频段关于移动通信公众网使用频段问题的复函 ，规定了900MHz频段为870 488 975MHz和915 934 975MHz，频道间隔25kHz，双工收发频率间隔为45MHz。 1984年邮电部以邮电字451函批准900MHz改为879 898 975MHz及924 943 975MHz。 近期国际上为了适应增容的需要，在TACS使用频段的基础上，又进行了频段扩展，把工作频段扩改为MS BS:872 905MHz BS MS 917 950MHz，称为E-TACS制式。
移动通信的调制技术 - 移动技术
http://www.themobiletechnology.org/yidongtongxinzhishi/yidongtongxin-de-tiaozhijishu.html
二进制序列的数字信息 1 和 0 ，分别用载波的相位0和π这两个离散值来表示，这种调制方式称作二相移相键控。 S(t) = Acos[ωc t Φ(t)] 1 1. 式中的Φ(t)取值0或π，由数字信息比特取 1 或取 0 决定。 S(t) = Acos[ω0 t mn(t) Φ Φ0] 1 2. 式中mn(t)为非归零n电平的对称基带信号，例如 1， 2， 3， Φ=2π/n为相邻信号的相位间隔，Φ0为初始相位。 每一个双比特码元是由两位二进制信息比特组成，它们分别代表四进制四个符号中的一个符号，我们用Xi表示双比特码元中前一个信息比特，用Yi表示后一个信息比特，在发端可由串 并转换电路来完成这种二 四进制变换，而在收端则可通过并 串变换电路来实现其反变换。 我们知道，四相调相信号的载波相位可以取由 Φ0 0 、Φ0 90 、. Φ0 180 、Φ0 270 四个值，其中Φ0为起始相位。
超声波发射器 - 移动技术
http://www.themobiletechnology.org/yidongtongxinchanpin/chaoshengbofasheqi.html
移动通信的发展历史 - 移动技术
http://www.themobiletechnology.org/yidongtongxinzhishi/yidongtongxin-de-fazhan-lishi.html
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移动技术 - 移动通信爱好者
早在80年代初，欧洲已有几大模拟蜂窝移动系统在运营，例如北欧的NMT 北欧移动电话 和英国的TACS 全接入通信系统 ，西欧其他各国也提供移动业务。 1132、IMT-2000的频谱分配 1992年世界无线电管制大会的规定 IMT-2000频谱分配如下 上行频段 1885 2025MHz 下行频段 2110 2200MHz . [阅读全文]. 较早的移动通信主要使用甚高频VHF 150MHz 和特高频UHF 450MHz 频段。 二进制序列的数字信息“1”和“0”，分别用载波的相位0和π这两个离散值来表示，这种调制方式称作二相移相键控。 IPhone 6是苹果公司 Apple 在2014年9月9日推出的一款手机，已于2014年9月19日正式上市。
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