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成形滤波可以在调制后对调制波以带通滤波方式完成,也可以在调制前对基带以低通滤波方式完成,两者的效果是相同的。在现代全数字调制解调器中,成形滤波器大都采用数字滤波器来实现。由于对基带信号进行数字滤波更为方便,因此成形滤波普遍采用基带数字滤波方案。-Shaping filter can be modulated by the modulation wave band-pass filtering is accomplished, it can before the modulation baseba
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GMSK是高斯滤波的最小频移键控的简称,基本的工作原理是将基带信号先经过高斯滤波器成形,再进行最小频移键控(MSK)调制。由于成形后的高斯脉冲包络无陡峭边沿,亦无拐点,因此频谱特性优于MSK信号的频谱特性。-GMSK Gaussian filter is the smallest FSK abbreviation, the basic working principle is to base-band signal to pass Gaussian filter shape, and then
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数字信号的传输方式分为基带传输和带通传输,在实际应用中,大多数信道具有带通特性而不能直接传输基带信号。为了使数字信号在带通信道中传输,必须使用数字基带信号对载波进行调制,以使信号与信道的特性相匹配。这种用数字基带信号控制载波,把数字基带信号变换为数字带通信号的过程称为数字调制。通常使用键控法来实现数字调制,比如对载波的振幅、频率和相位进行键控。-Transmission of digital signals into base band transmission and band-pass tr
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2ASK(1)通信系统仿真进行2ASK调制,其中基带信号为单极性NRZ矩形波,采用相干解调方法对带通滤波器的输出信号进行解调;-2ASK (1) 2ASK modulation for communication systems simulation, in which the baseband signal is unipolar NRZ square wave, coherent demodulation method using band-pass filter output signal
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用MATLAB编写与仿真了MSK信号,其中结合了自己写的快速傅立叶变换实现了MSK信号的调制还有解调,而且作为拓展,还加入噪声、通过带通滤波器、低通滤波器、载波信号等等。调制解调都很有用,画出的图也很漂亮规范。-Using MATLAB and the simulation of the MSK signal, which combines the fast Fourier transform to write their own modulation there demodulation of
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移相法生成单边带调制信号,对m(t)=sinc^2(t)函数构成的基带信号进行单边带调制,接收端相干解调低通滤波。-ssb_mod_01.m- phase shift method to generate the single sideband modulation signal m (t) = the sinc ^ 2 (t) function constitute the base band signal performs single sideband modulation, the re
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数字信号的传输方式分为基带传输和带通传输,在实际应用中,大多数信道具有带通特性而不能直接传输基带信号。为了使数字信号在带通信道中传输,必须使用数字基带信号对载波进行调制,以使信号与信道的特性相匹配。这种用数字基带信号控制载波,把数字基带信号变换为数字带通信号的过程称为数字调制。通常使用键控法来实现数字调制,比如对载波的振幅、频率和相位进行键控-The transmission mode of the digital signal is divided into a base-band trans
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数字信号的传输方式分为基带传输和带通传输,在实际应用中,大多数信道具有带通特性而不能直接传输基带信号。为了使数字信号在带通信道中传输,必须使用数字基带信号对载波进行调制,以使信号与信道的特性相匹配。这种用数字基带信号控制载波,把数字基带信号变换为数字带通信号的过程称为数字调制。通常使用键控法来实现数字调制,比如对载波的振幅、频率和相位进行键控-The transmission mode of the digital signal is divided into a base-band trans
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matlab实现采样定理,包括低通,带通以及频率调制。-matlab sampling theorem, including low-pass, band-pass, and frequency modulation.
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To study the digital modulation techniques such as on-off keying (OOK), amplitude shift keying (ASK),frequency shift keying (FSK), binary phase shift keying (BPSK) and phase shift keying (PSK) pass band modulation and demodulation using MATLAB Simuli
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基于复解析带通滤波器的复调制细化谱分析原理和方法-Complex analytic band-pass filter-based complex modulation Zoom Spectrum analysis principles and methods
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实现了一个基本的AM的调制解调系统,其中包括信息信号,载波信号,已调制信号,通过带通滤波器后的信号及解调后的信号。-Achieve a basic modulation and demodulation of AM systems, including an information signal, the carrier signal and the modulated signal through the band pass filter signal and the demodulated
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FFT频谱分析 带通数字滤波器 高通、低通、带阻滤波器 信号调制解调 傅立叶变换 分析传输函数-FFT spectrum analysis bandpass digital filter high-pass, low-pass filter signal modulation and demodulation Fourier transform analysis of the transfer function of band-stop
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介绍了2PSK的调制解调原理,接收机有带通滤波器和升余弦滤波器接收的性能比较-Describes the modulation and demodulation principle 2PSK, the receiver has a band-pass filter and a raised cosine filter receiver performance comparison
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QPSK信号的调制解调过程,内容包括带通滤波,脉冲成形,以及硬判决译码过程-QPSK modulation and demodulation process of the signal, including a band-pass filtering, pulse shaping, and a hard-decision decoding process
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基于MATLABA的数字带通系统调制波形及频谱-Based MATLABA the digital band-pass system modulation waveform and spectrum
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Perform base band QPSK modulation of a bit stream:
(a) without using in-built function,
(b) using in-built function.
Pass it through an AWGN channel and plot SNR versus BER of the received signal.
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阵列信号处理的高分辨率估计,供做算法研究人员参考,是机器学习的例程,采用波束成形技术的BER计算,有信道编码,调制,信道估计等,FIR 底通和带通滤波器和IIR 底通和带通滤波器。-High-resolution array signal processing estimates, Algorithm for researchers to do reference, Machine learning routines, By applying the beam forming technolog
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调制:将各种数字基带信号转换成适于信道传输的数字调制信号(已调信号或频带信号)。解调:在接收端将收到的数字频带信号还原成数字基带信号. 调制就是将基带信号的频谱搬移到信道通带中或者其中的某个频段上的过程,而解调是将信道中来的频带信号恢复为基带信号的反过程.-Modulation: converts various digital baseband signal to channel suitable for transmission of digital modulation signal (m
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1.对信源进行AM,DSB,SSB调制
2.信道中各自加入进过带通滤波器后的窄带高斯白噪声,解调每个信号,并画出滤除前后,双边带信号和单边带信号的频谱。-1. Letter source AM, DSB, SSB modulation
2. Add to each channel through the band pass filter into a narrow band Gaussian white noise, each signal demodulated, filtered a
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