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低频信号先进行放大,再调制解调,设计发射机和接收机-Low-frequency signal is first amplified, and then modulation and demodulation, the transmitter and receiver design
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低频信号先进行放大,再调制解调,设计发射-Low-frequency signal is first amplified, and then modulation and demodulation, the transmitter
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This model demonstrates a DC-AC converter.
3 leg Mosfet operated inverter is constructed .
Can be used to demonstrate the relationship of input DC, output voltage, modulation index , filter selection and switching frequency.
3rd harmonic inject
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本程序是关于卫星上下变频的简单的实现算法,首先产生双边带调制信号,与收本振混频后,通过低通滤波器完成下变频。再与发本振混频,通过高通滤波器后完成上变频-This program is a simple algorithm on the satellite and down-conversion, the first double-sideband modulation signal generated, after the close of the oscillator mixer, low-p
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双极性单相逆变电路,PWM脉宽调制,高频率使输出电压指标变好-Bipolar Single-phase inverter circuit, PWM pulse width modulation,High frequency indicators changed for the better so that the output voltage
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基于MSP430的FSK硬件调制程序 采用改变时钟频率的新方法-Based on MSP430 FSK modulation hardware program using new method to change the clock frequency
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OFDM(Orthogonal Frequency Division Multiplexing)即正交频分复用技术,实际上OFDM是MCM Multi-CarrierModulation,多载波调制的一种。其主要思想是:将信道分成若干正交子信道,将高速数据信号转换成并行的低速子数据流,调制到在每个子信道上进行传输。正交信号可以通过在接收端采用相关技术来分开,这样可以减少子信道之间的相互干扰 ICI 。每个子信道上的信号带宽小于信道的相关带宽,因此每个子信道上的可以看成平坦性衰落,从而可以消除码间
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TMS320F2812实现三相SPWM波形,载波频率为3KHz,载波比N=60,调制度为0.8-TMS320F2812 achieve three-phase SPWM waveform, the carrier frequency of 3KHz, carrier ratio N = 60, 0.8 modulation
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bpsk的调制与解调的过程,并采用卷积码,讨论其误码性能随着其功率、频偏、相偏而变化.-bpsk modulation and demodulation process and using convolutional codes, to discuss its error performance with its power, frequency offset, phase offset changes.
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scr ipt for computing the SNR loss due to frequency offset in OFDM modulation
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OFDM(Orthogonal Frequency Division Multiplexing)即正交频分复用技术,实际上OFDM是多载波调制的一种。其主要思想是:将信道分成若干正交子信道,将高速数据信号转换成并行的低速子数据流,调制到在每个子信道上进行传输。正交信号可以通过在接收端采用相关技术来分开,这样可以减少子信道之间的相互干扰 ICI 。每个子信道上的信号带宽小于信道的相关带宽,因此每个子信道上的可以看成平坦性衰落,从而可以消除符号间干扰。而且由于每个子信道的带宽仅仅是原信道带宽的一小部
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本软件实现光伏电池出来的低压直流电逆变成高压工频交流电,顺利把太阳能转换成的电能馈送到电网。本软件的主要功能大概分为五部分:1)配置MCU处理器的PWM模块(脉宽调制信号)为互补工作模式使两个反激变换器交替工作,实现交错反激工作模式;2)根据电网周期,在合适的时刻本软件驱动硬件电路,实现逆变,把直流电转换为50Hz、220V交流电;3)本软件具有无线监控功能,通过无线模块监测逆变器工作状态;4)本软件有串口调试功能,可以方便调试程序5)本软件有输出电压超压保护,输出电流过流保护,频率保护-The
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CP-OFDM仿真,详细,有资料,有程序。-Matlab file for simulating a cyclic-prefix (CP) orthogonal-frequency-
division-multiplexing (OFDM) system with binary phase-shift keying (BPSK)
modulation on each subcarrier. CP-OFDM system includes a repetition code
an
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红外收发演示,红外测试程序,用单片机通过发射管发射38K的调制频率码,由一体化接收并解码由发光管显示-Infrared transceiver demo, infrared testing program, microcontroller through the launch tube with the launch of 38K code modulation frequency, from integration to receive and decode from the LED disp
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包括相位编码(含二相BPSK和四相QPSK)、线性调频LFM、非线性调频NLFM、脉冲幅度调制(PAM)信号、带噪FSK频率编码信号等的信号源码,是很好的产生各种雷达信号的程序资源。-Including the phase encoding (including two-phase four-phase BPSK and QPSK), LFM LFM, non-linear FM NLFM, pulse amplitude modulation (PAM) signal with noise s
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51单片机红外发送端程序,载波频率38K,由单片机自动完成调制-Infrared transmitter 51 MCU program, the carrier frequency of 38K, done automatically by the MCU modulation
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详细模拟了调频系统 采用DPSK调制 包含跳频系统的全部模块-Detailed simulation of the FM system using DPSK modulation frequency hopping system includes all of the modules
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正交频分复用(OFDM)是一种通过快速傅里叶变换实现的多载波宽带数字调制技术。相比一般的数字通信系统。它具有频带利用率高和抗多径干扰能力强等优点,因而适合于高速率的无线通信系统。正交频分复用 OFDM 是第四代移动通信的核心技术。论文首先简要介绍了OFDM基本原理。在给出OFDM系统模型的基础上,用MATLAB语言实现了整个系统的计算机仿真并给出参考设计程序。-Orthogonal frequency division multiplexing (OFDM) is a fast Fourier
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OFDM调制程序,可看到OFDM频域波形-OFDM modulation, the OFDM frequency domain waveforms can be seen
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FPGA中实现的MSK调制,带modelsim仿真。实际系统测试通过:载波和调制波信号频率可调。调制框图请参见樊昌信 通信原理247页-MSK modulation implemented in FPGA with modelsim simulation. The actual test system: a carrier wave signal and the modulation frequency is adjustable. See Fan Changxin modulation blo
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