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Orthogonal frequency division multiplexing (OFDM) is becoming the chosen
modulation technique for wireless communications. OFDM can provide large data
rates with sufficient robustness to radio channel impairments. Many research centers
in the w
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一种线性自动补偿的定频调幅式电涡流位移传感器,专利文献，请参考-A linear automatic compensation of the fixed-frequency eddy current displacement sensor amplitude modulation, patent literature, see
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频率切换时间短、工作频率范围宽、频率分辨率高、相位变化连续和容易对输出信号实现调制等。一些公司先后推出了各种各样的DDS专用芯片，这些DDS专用芯片为电路设计提供了很大方便，但是并不能满足所有要求。例如，在实现调频及调幅等复杂功能时，利用现有专用芯片就会很不方便。利用可编程逻辑器件或现场可编程门阵列实现具有很大的灵活性，能够很好地满足电路设计要求。 -Frequency switching time is short, the operating frequency range, high f
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包括幅度调制的处理原理及信号幅度调制的方法，和用时域和频域的方式表示幅度调制的结果.
-Method of processing principle and signal amplitude modulation including amplitude modulation, and the use of time domain and frequency domain representation of amplitude modulation results.
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This paper presents the simulation performance of the all-digital symbol timing recovery using the Gardner Timing Error Detector over π/4-DQPSK modulation. The open loop statistics, the S-curve and the normalized timing error variance, were investiga
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基于循环统计理论, 对循环平稳信号进行处理, 主要研究了信号的二阶循环统计特性, 即循环自相关函数和循环谱密度, 指出循环自相关函数不为零的循环频率对应着信号中的某些故障, 并
可以对调幅信号进行解调. 通过循环频率扫描方法提取的调制源分布在循环频率域的低频段, 其结
果可用循环频率-频率- 循环谱密度的三维图表示. 用仿真信号对该方法进行验证, 并应用于滚动轴承的内、外圈及滚动体的故障诊断, 可以有效地分离出所对应的故障特征频率.-Statistical theory based on
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Orthogonal Frequency Division Multiplexing (OFDM) is a multicarrier modulation and multiplexing technique
proposed for 3G, 4G LTE-A systems to achieve higher data rates with better spectral efficiency at low latency. Time
varying nature of the wi
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Multicarrier modulations attract a lot of attention ranging from wireline to wireless
communications compared to single carrier modulation because of theirs capability to
efficiently cope with frequency selective fading channels. Much of attentio
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2FSK频率选择法调制及相关检测、包络检测的matlab程序，供仿真参考-2FSK modulation frequency selection method and related testing, envelope detection matlab program for the simulation of reference
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MSK调制，可以修改模块的信道、无线速率和功率，修改参数协议见易达讯无线模块参数设定协议。默认空中速率38.4K、信道为0信道、信道间隔为200KHz、载波基频434MHz、滤波带宽203KHz、CC1100模块发送以后进入接收模式。-MSK modulation, you can modify the module channel wireless speed and power, modify the parameters and protocols See Estar wireless m
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将OFDM技术运用在可见光通信的研究，并且把OFDM的高峰均比这一缺点进行了建设性的运用。-In
particular, the use of OFDM (orthogonal frequency division
multiplexing) for intensity modulation is investigated. The high
peak-to-average ratio (PAR) in OFDM is usually considered
a disadvant
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数字调制就是把数字基带信号的频谱搬移到高频处，形成适合在信道中传输的带通信号。基本的数字调制方式有振幅键控（ASK）、频移键控（FSK）、绝对相移键控（PSK）、相对（差分）相移键控（DPSK）。在接收端可以采用想干解调或非相干解调还原数字基带信号。
-Digital modulation is the spectrum shifting to high frequency digital baseband signals, suitable for the formation of ban
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The 4g wireless uses Orthogonal Frequency Division Multiplexing (OFDM), Ultra Wide Radio Band (UWB), and Millimeter wireless. Data rate of 20mbps is employed. Mobile speed will be up to 200km/hr. The high performance is achieved by the use of long te
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提出一种全新的子载波调制方式盲识别算法,该算法利用ＯＦＤＭ子载波组的统计特性,然后通过推导得到新的基于混合高阶矩的特征量,使得到新的特征量不受信噪比、载波频偏与相位偏移的影响。
-Proposed a new sub-carrier modulation count Blind Identification
Method, the method using the statistical characteristics of the OFDM sub-carrier group, an
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FPGA有价值的27个例子，其中包括LED控制，频率计，电子琴等基于状态机的经典例子，简单的编码调制等等。源代码以文档形式给出。-Examples of valuable FPGA 27 includes an LED control, frequency, keyboard, etc. The classic example of a state machine based on the simple coding and modulation and so on.
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AM RECEIVER based on super heterodyne principle virtually used in all modern radio and television receivers. The approach mainly involves the use of heterodyning or frequency mixing. The signal from the antenna is filtered sufficiently at least to re
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Synchronization in OFDM
With its robustness against multipath fading, orthogonal
frequency division multiplexing (OFDM) has become
the modulation of choice for many modern wireless standards.
However, OFDM is very sensitive to offsets in f
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Simulation and performance analysis of OFDM with different modulation techniques
A special case of multicarrier transmission is Orthogonal Frequency Division Multiplexing (OFDM).In which single data stream is transmitted over a number of lower rate
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首先，介绍了交流调速及其相关技术的发展现状和发展趋势，以及交流调速系统的主要控制策略。选用工业变频器用异步电机作为研究对象，利用坐标变换理论，分析了异步电机在三相静止坐标系、两相静止与旋转坐标下的电机基本数学模型及其矢量控制原理。利用转子磁场定向的矢量控制技术，实现了异步电机定子电流的转矩分量和励磁分量的解耦。分析了空间矢量脉宽调制算法以及实现方法，最后设计了异步电机的双闭环矢量控制系统。
然后，利用Matlab/Simulink搭建了异步电机数学模型，建立了基于电压空间矢量脉宽调制的异步电
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Simulink® and Stateflow® model of a full duplex Bluetooth communication link transmitting HV1, HV2, HV3, and SCORT [1] voice packets, and DM1 data packets. A system parameters block configures the whole model s packet type, slot pair and chan
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