搜索资源列表
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2下载：
将调制信号通过Hilbert变换，解调出低频信号(Demodulating the low frequency signal through the modulation signal through the Hilbert transform)
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CDMA通信系统中的扩频码，跳频码，信号分选，参数估计，调制识别(Spread code in CDMA communication system, frequency hopping code, signal sorting, parameter estimation, modulation recognition)
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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 Carrier Modulation)，多载波调制的一种。(OFDM(Orthogonal Frequency Division Multiplexing is an orthogonal frequency division multiplexing technique. In fact, OFDM is a kind of MCM(Multi
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产生4FSK调制信号的函数，可以设置载波频率，采样频率。(The function of generating 4FSK modulation signal can set carrier frequency and sampling frequency.)
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本文建立了一个基于直接转矩控制的异步电机变频调速系统。系统采用了两个滞环控制器,分别比较定子给定磁链与实际磁链、给定转矩与实际转矩的差值,然后根据这两个差值查询逆变器电压矢量开关表得到施加在异步电动机定子绕组上的电压矢量,然后通过脉冲宽度调制(Pulse Width Modulation,PWM)逆变器控制异步电动机。(An asynchronous motor variable frequency speed regulation system based on direct torque c
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FFT频偏估计算法，性能不错，用于GMSK调制(FFT frequency offset estimation algorithm, good performance, for GMSK modulation)
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能够实现轨道交通高频和低频信号调制，显示出相应的信息。(It can realize high frequency and low frequency signal modulation of rail transit and display corresponding information.)
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能够产生北斗B1频点37个卫星的信号，调制了CA码和NH码及不同卫星的PRN码(Can produce beidou B1 frequency point 37 of the satellite signal, modulation of CA code and NH code and different satellite PRN code)
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环路滤波器是通信信号调制解调中最重要的一个部分，环路滤波器设计的好坏将直接影响到接收机的性能指标，二阶锁频辅助三阶锁相环路滤波器可以稳定跟踪具有加加速度的信号源，是现代通信中非常实用的技术，本文中详细编写了单载波信号产生模块、信道噪声模块、数字正交下变频模块、鉴频鉴相模块、环路滤波器模块，并包含了完整的testbench模块，对于初学者非常有用。(Loop filter is the most important part of communication signal modulation a
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qpsk信号的产生，并在成型滤波和调制后的时域频域图，及载波调制后星座图观察(The QPSK signal is generated and observed in the time-domain and frequency-domain diagram after shaping filtering and modulation, and the constellation diagram after carrier modulation)
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