This books presents the research work of COST 273 Towards Mobile Broadband Multimedia Networks, hence, it reports on the work performed and on the results achieved within the project by its participants. The material presented here corresponds to the results obtained in four years of collaborative work by more than 350 researchers from 137 institutions (universities, operators, manufacturers, regulators, independent laboratories and others – a full list is provided in Appendix B) belonging to 29 countries (mainly European, but also from Asia and North America) in the area of mobileradio. Theobjectiveofpublishingtheseresultsasabookisessentiallytomakethemavailable to an audience wider than the project. In fact, it just follows a ‘tradition’ of previous COST Actions in this area of telecommunications, i.e. COST 207, 231 and 259.
标签： Multimedia Techniques Broadband Networks Mobile
上传时间： 2020-05-30
上传用户：shancjb
A wireless communication network can be viewed as a collection of nodes, located in some domain, which can in turn be transmitters or receivers (depending on the network considered, nodes may be mobile users, base stations in a cellular network, access points of a WiFi mesh etc.). At a given time, several nodes transmit simultaneously, each toward its own receiver. Each transmitter–receiver pair requires its own wireless link. The signal received from the link transmitter may be jammed by the signals received from the other transmitters. Even in the simplest model where the signal power radiated from a point decays in an isotropic way with Euclidean distance, the geometry of the locations of the nodes plays a key role since it determines the signal to interference and noise ratio (SINR) at each receiver and hence the possibility of establishing simultaneously this collection of links at a given bit rate. The interference seen by a receiver is the sum of the signal powers received from all transmitters, except its own transmitter.
标签： Stochastic Geometry Networks Wireless Volume and II
上传时间： 2020-06-01
上传用户：shancjb
STM32 F1系列 MCU ATIUM AD集成库 原理图库 PCB 3D封装库文件,STM32F1XXXXX全系列原理图+PCB封装库文件，共209个器件型号，CSV text has been written to file : STM32 F1.csvLibrary Component Count : 209Name Description----------------------------------------------------------------------------------------------------STM32F100C4T6B STM32 ARM-based 32-bit MCU Value Line with 16 kB Flash, 4 kB Internal RAM, Internal Code B, -40 to +85癈 Temperature, 48-Pin LQFP, TraySTM32F100C4T7B STM32 ARM-based 32-bit MCU Value Line with 16 kB Flash, 4 kB Internal RAM, Internal Code B, -40 to +105癈 Temperature, 48-Pin LQFP, TraySTM32F100C6T6B STM32 ARM-based 32-bit MCU Value Line with 32 kB Flash, 4 kB Internal RAM, Internal Code B, -40 to +85癈 Temperature, 48-Pin LQFP, TraySTM32F100C6T6BTR STM32 ARM-based 32-bit MCU Value Line with 32 kB Flash, 4 kB Internal RAM, Internal Code B, -40 to +85癈 Temperature, 48-Pin LQFP, Tape and ReelSTM32F100C6T7B STM32 ARM-based 32-bit MCU Value Line with 32 kB Flash, 4 kB Internal RAM, Internal Code B, -40 to +105癈 Temperature, 48-Pin LQFP, TraySTM32F100C8T6B STM32 ARM-based 32-bit MCU Value Line with 64 kB Flash, 8 kB Internal RAM, Internal Code B, -40 to +85癈 Temperature, 48-Pin LQFP, TraySTM32F100C8T6BTR STM32 ARM-based 32-bit MCU Value Line with 64 kB Flash, 8 kB Internal RAM, Internal Code B, -40 to +85癈 Temperature, 48-Pin LQFP, Tape and ReelSTM32F100CBT6B STM32 ARM-based 32-bit MCU Value Line with 128 kB Flash, 8 kB Internal RAM, Internal Code B, -40 to +85癈 Temperature, 48-Pin LQFP, TraySTM32F100CBT7B STM32 ARM-based 32-bit MCU Value Line with 128 kB Flash, 8 kB Internal RAM, Internal Code B, -40 to +105癈 Temperature, 48-Pin LQFP, TraySTM32F100R4H6B STM32 ARM-based 32-bit MCU Value Line with 16 kB Flash, 4 kB Internal RAM, Internal Code B, -40 to +85癈 Temperature, 64-Pin TFBGA, TraySTM32F100R4T6B STM32 ARM-based 32-bit MCU Value Line with 16 kB Flash, 4 kB Internal RAM, Internal Code B, -40 to +85癈 Temperature, 64-Pin LQFP, TraySTM32F100R4T6BTR STM32 ARM-based 32-bit MCU Value Line with 16 kB Flash, 4 kB Internal RAM, Internal Code B, -40 to +85癈 Temperature, 64-Pin LQFP, Tape and ReelSTM32F100R6H6B STM32 ARM-based 32-bit MCU Value Line with 32 kB Flash, 4 kB Internal RAM, Internal Code B, -40 to +85癈 Temperature, 64-Pin TFBGA, TraySTM32F100R6T6 STM32 ARM-based 32-bit MCU Value Line with 32 kB Flash, 4 kB Internal RAM, -40 to +85癈 Temperature, 64-Pin LQFP, TraySTM32F100R6T6B STM32 ARM-based 32-bit MCU Value Line with 32 kB Flash, 4 kB Internal RAM, Internal Code B, -40 to +85癈 Temperature, 64-Pin LQFP, TraySTM32F100R6T6BTR STM32 ARM-based 32-bit MCU Value Line with 32 kB Flash, 4 kB Internal RAM, Internal Code B, -40 to +85癈 Temperature, 64-Pin TFBGA, Tape and ReelSTM32F100R8H6B STM32 ARM-based 32-bit MCU Value Line with 64 kB Flash, 8 kB Internal RAM, Internal Code B, -40 to +85癈 Temperature, 64-Pin TFBGA, TraySTM32F100R8T6B STM32 ARM-based 32-bit MCU Value Line with 64 kB Flash, 8 kB Internal RAM, Internal Code B, -40 to +85癈 Temperature, 64-Pin LQFP, TraySTM32F100R8T6BTR STM32 ARM-based 32-bit MCU Value Line with 64 kB Flash, 8 kB Internal RAM, Internal Code B, -40 to +85癈 Temperature, 64-Pin LQFP, Tape and ReelSTM32F100RBH6B STM32 ARM-based 32-bit MCU Value Line with 128 kB Flash, 8 kB Internal RAM, Internal Code B, -40 to +85癈 Temperature, 64-Pin TFBGA, TraySTM32F100RBH6BTR STM32 ARM-based 32-bit MCU Value Line with 128 kB Flash, 8 kB Internal RAM, Internal Code B, -40 to +85癈 Temperature, 64-Pin TFBGA, Tape and ReelSTM32F100RBT6B STM32 ARM-based 32-bit MCU Value Line with 128 kB Flash, 8 kB Internal RAM, Internal Code B, -40 to +85癈 Temperature, 64-Pin LQFP, TraySTM32F100RBT6BTR STM32 ARM-based 32-bit MCU Value Line with 128 kB Flash, 8 kB Internal RAM, Internal Code B, -40 to +85癈 Temperature, 64-Pin LQFP, Tape and ReelSTM32F100RCT6B STM32 ARM-based 32-bit MCU Value Line with 256 kB Flash, 24 kB Internal RAM, Internal Code B, -40 to +85癈 Temperature, 64-Pin LQFP, TraySTM32F100RDT6 STM32 ARM-based 32-bit MCU Value Line with 384 kB Flash, 32 kB Internal RAM, -40 to +85癈 Temperature, 64-Pin LQFP, TraySTM32F100RDT6B STM32 ARM-based 32-bit MCU Value Line with 384 kB Flash, 32 kB Internal RAM, Internal Code B, -40 to +85癈 Temperature, 64-Pin LQFP, TraySTM32F100RET6 STM32 ARM-based 32-bit MCU Value Line with 512 kB Flash, 32 kB Internal RAM, -40 to +85癈 Temperature, 64-Pin LQFP, TraySTM32F100RET6B STM32 ARM-based 32-bit MCU Value Line with 512 kB Flash, 32 kB Internal RAM, Internal Code B, -40 to +85癈 Temperature, 64-
上传时间： 2022-04-30
上传用户：jiabin
·详细说明：双音多频的DTMF信号编码程序，产生DTMF信号进行编码。- The double sound multi- frequencies DTMF signal coded program, produces the DTMF signal to carry on the code.
上传时间： 2013-04-24
上传用户：yangzhiwei
Many applications require a clock signal to be synchronous, phase-locked, or derived fromanother signal, such as a data signal or another clock. This type of clock circuit is important in
上传时间： 2014-12-23
上传用户：qq21508895
Photodiodes can be broken into two categories: largearea photodiodes with their attendant high capacitance(30pF to 3000pF) and smaller area photodiodes withrelatively low capacitance (10pF or less). For optimalsignal-to-noise performance, a transimpedance amplifi erconsisting of an inverting op amp and a feedback resistoris most commonly used to convert the photodiode currentinto voltage. In low noise amplifi er design, large areaphotodiode amplifi ers require more attention to reducingop amp input voltage noise, while small area photodiodeamplifi ers require more attention to reducing op amp inputcurrent noise and parasitic capacitances.
上传时间： 2013-10-28
上传用户：hanbeidang
A fully differential amplifi er is often used to converta single-ended signal to a differential signal, a designwhich requires three signifi cant considerations: theimpedance of the single-ended source must match thesingle-ended impedance of the differential amplifi er,the amplifi er’s inputs must remain within the commonmode voltage limits and the input signal must be levelshifted to a signal that is centered at the desired outputcommon mode voltage.
上传时间： 2013-11-09
上传用户：wweqas
开关在电路中起接通信号或断开信号的作用。最常见的可控开关是继电器，当给驱动继电器的驱动电路加高电平或低电平时，继电器就吸合或释放，其触点接通或断开电路。CMOS模拟开关是一种可控开关，它不象继电器那样可以用在大电流、高电压场合，只适于处理幅度不超过其工作电压、电流较小的模拟或数字信号。 一、常用CMOS模拟开关引脚功能和工作原理 1.四双向模拟开关CD4066 CD4066 的引脚功能如图1所示。每个封装内部有4个独立的模拟开关，每个模拟开关有输入、输出、控制三个端子，其中输入端和输出端可互换。当控制端加高电平时，开关导通；当控制端加低电平时开关截止。模拟开关导通时，导通电阻为几十欧姆；模拟开关截止时，呈现很高的阻抗，可以看成为开路。模拟开关可传输数字信号和模拟信号，可传输的模拟信号的上限频率为40MHz。各开关间的串扰很小，典型值为－50dB。
上传时间： 2013-10-27
上传用户：bibirnovis
减小电磁干扰的印刷电路板设计原则 内 容 摘要……1 1 背景…1 1.1 射频源.1 1.2 表面贴装芯片和通孔元器件.1 1.3 静态引脚活动引脚和输入.1 1.4 基本回路……..2 1.4.1 回路和偶极子的对称性3 1.5 差模和共模…..3 2 电路板布局…4 2.1 电源和地…….4 2.1.1 感抗……4 2.1.2 两层板和四层板4 2.1.3 单层板和二层板设计中的微处理器地.4 2.1.4 信号返回地……5 2.1.5 模拟数字和高压…….5 2.1.6 模拟电源引脚和模拟参考电压.5 2.1.7 四层板中电源平面因该怎么做和不应该怎么做…….5 2.2 两层板中的电源分配.6 2.2.1 单点和多点分配.6 2.2.2 星型分配6 2.2.3 格栅化地.7 2.2.4 旁路和铁氧体磁珠……9 2.2.5 使噪声靠近磁珠……..10 2.3 电路板分区…11 2.4 信号线……...12 2.4.1 容性和感性串扰……...12 2.4.2 天线因素和长度规则...12 2.4.3 串联终端传输线…..13 2.4.4 输入阻抗匹配...13 2.5 电缆和接插件……...13 2.5.1 差模和共模噪声……...14 2.5.2 串扰模型……..14 2.5.3 返回线路数目..14 2.5.4 对板外信号I/O的建议14 2.5.5 隔离噪声和静电放电ESD .14 2.6 其他布局问题……...14 2.6.1 汽车和用户应用带键盘和显示器的前端面板印刷电路板...15 2.6.2 易感性布局…...15 3 屏蔽..16 3.1 工作原理…...16 3.2 屏蔽接地…...16 3.3 电缆和屏蔽旁路………………..16 4 总结…………………………………………17 5 参考文献………………………17
上传时间： 2013-10-24
上传用户：18165383642
为了使音频信号分析仪小巧可靠，成本低廉，设计了以2片MSP430F1611单片机为核心的系统。该系统将音频信号送入八阶巴特沃兹低通滤波器，对信号进行限幅放大、衰减、电平位移、缓冲，并利用一单片机负责对前级处理后的模拟信号进行采样，将采集得到的音频信号进行4 096点基2的FFT计算，并对信号加窗函数提高分辨率，另一单片机负责对信号的分析及控制显示设备。此设计精确的测量了音频信号的功率谱、周期性、失真度指标，达到较高的频率分辨率，并能将测量结果通过红外遥控器显示在液晶屏上。 Abstract: o make the audio signal analyzer cheaper， smaller and more reliable， this system sends the audio signal to the eight-order butterworth filter， and then amplifies， attenuates， buffers it in a limiting range， transfers the voltage level of the signal before utilizing two MSP430F1611 MCU to realize the audio analysis. One is charged for sampling and dealing with the processed audio signal collected by the 4096 point radix-2 FFT calculation and imposes the window function to improve the frequency resolution. The other one controls the display and realizes the spectrum， periodicity， power distortion analysis in high resolution which is displayed in the LCD screen through the infrared remote control.
上传时间： 2013-12-11
上传用户：jasonheung
