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数据通信 data communications
以数字形式存储 stored in digital form Datum 的复数 data
Spectrum 的复数spectra 远程终端 remote terminal
外围设备 peripheral equipment 串行 serial , 并行 parallel
时钟周期 the time of a signal clock pulse 星形拓扑 star topolologies 单向 unidirectional
有线电视行业 cable television industry 公共的杆状物上放置天线
Palace an antenna on top of a large utility pole 供一个区域共享 locally shared the signal 主天线 master antenna 分发到一个大的区域
Be distributed over a large area
光馈链接 optical feeder links
频分复用 frequency division multiplexing 频分多址 frequency division multiple acce 单向树状结构 unidirectional tree 对电缆中的信号衰减进行补偿
Compensate for the attenuation of the cable signal
光纤同轴混合网 HFC = hybrid fiber/coaxial 视频点播 VOD = video on demand
分组交换有线网络 packet-switched wirelenetwork
频率大约在…….Frequencies that range from approximately….预加重网络 preemphasis network 去加重网络 deemphasis network 调频器 FM deviator
检波器 detector，混频器 mixer
鉴频器 discriminator，晶振 crystal oscillator 向上变频up-converted the frequencies to… 幅频特性
amplitude-versus-frequency characteristics 卫星载荷技术
satellite payload technology 面向公众 to the public
同步卫星 geostationary satellite 蜂窝移动电话 cellular mobile phone
多点波束覆盖技术 multi-spot-beam coverage
视线传播 line-of-sight propagation平方反比定律 inverse square law
在相同频率，相同时间，相同波束或极化上传输 transmit on the same frequency , at the same time and in the same beam or polarization
跳 频序列 frequency hoppig sequence
扩频序列 spreading sequence
互调失真 IMD = intermodulation distortion 多址通信有三种方式：频分多址，时分多址，码分多址multi-acce communications systems include the three familiar methods: FDMA, TDMA , and CDMA
CDMA 网络容量不是无限的，因为在一些点上信道会过载，原因是占用它的用户的自干扰
The capacity of a CDMA network is not unlimited ,because at some point the channel becomes overloaded by self-interference from the multiple users who occupy it
更关键的功率控制，因为提升一个载波的功率对其他载波而言，噪声电平会相应增加 Furthermore , power level control is critical.because a given CDMA carrier that is elevated in power will raise the noise level for all others carriers by a like amount 赤道 equator，上行电路 uplink
以某个数量级 by an order of magnitude 近赤道轨道equatorial orbitAP = Aociated pre
UPI = united pre internationalDTE = data terminal equipment HFC = hybrid fiber/coaxial
FDM = frequency division multiplexing TDMA = time division multiple acce GPS = global positioning system GPRS = general packet radio service GSM = global system for mobile
PSTN = public switched telephone network MSC = mobile system center
HLR = home location registrationVLR = visitor location registration
BSC = base station controller基站控制器 BTC = base transceiver system基站收发系统 IMD互调失真 intermodulation distortion SCPC = single channel per carrier
DCE = data communications equipmentCB = citizens band，HDX = half duplex FDX = full duplex CN = core network
CATV = community antenna Television FTTC = fiber-to-the-curb FES = fixed earth stations
CTS = cellular telephone service
PCS = personal communications systems
PCSS = personal communications satellite system
