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Amplitude-shift keying (ASK) is a form of modulation that represents digital data as variations in the amplitude of a carrier wave.
Any din scheme uses a finite number of distinct signals to represent digital data. ASK uses a finite number of ampli
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常用跳频，扩频信号的调制与解调，主要用于通信及数字信号处理领域-Commonly used frequency hopping, spread spectrum modulation and demodulation of the signal, mainly used in the field of communications and digital signal processing
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这是一个音乐读取，时域波形显示（静态），频域频谱（静态），音乐变调，频谱分析的Matlab源程序，纯自己编写！-This is a music reading, time-domain waveform display (static) frequency domain spectrum (static), music modulation, spectral analysis of Matlab source, pure write your own!
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通信系统与仿真作业：
1）设计π/4-DPSK或16-QAM调制器仿真程序， 画出时域波形、 正交分量、同相分量波形，眼图，散点图等。
2）利用MATLAB进行DPSK在高斯信道下的BER性能仿真，并将结果与PSK性能进行比较。
3）已知 OFDM的数据传输速率为19.2Kbps， OFDM 符号长度为320，保护间隔为32点，子载波数为128，IFFT/FFT点数为256，载波频率320KHz，调制方案采用QPSK，仿真其在高斯信道下的BER性能。
-Communication
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跳频通信仿真平台，提供2FSK、MSK、QPSK信号的跳频调制及解调，可以显示误码率，跳频前后时域波形、频域波形及时频矩阵-Hopping communication simulation platform, providing 2FSK, MSK, QPSK modulation and demodulation signal hopping, you can display error rate, hopping around the time-domain waveform, freque
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正交频分复用系统中信号的调制与解调，我们用傅里叶反变换和变换来实现-Orthogonal frequency division multiplexing system signal modulation and demodulation, and we use the inverse Fourier transform to achieve transform
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QPSK调制与解调，低通滤波器采用了时域和频域两种实现方式，截止频率fc = 200hz,采样频率fs= 1000hz,欢迎下载参考！-QPSK modulation and demodulation, using a low-pass filter with a time domain and frequency domain implemented way, the cutoff frequency fc = 200hz, the sampling frequency fs = 1000hz
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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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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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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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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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PCM/FM信号生成函数，包含基于FM调制以及CPM调制方式，前者是利用matlab中的fm模拟频率调制方式，是对PCM/FM信号比较直观的生成方法，后者是利用CPM信号的生成方法，从相位调制的角度生成。-Here is PCM/FM signal generating function, including on CPM modulation and FM modulation, the former is the use matlab simulation frequency fm modu
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单极倍频调制方式仿真模型，基于matlab simulink，适合初学者学习使用。-Unipolar modulation frequency doubling simulation model, based on matlab simulink, suitable for beginners to learn to use.
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fsk调制，频率采样法设计滤波器的数字通信系统仿真-fsk modulation, frequency sampling filter design digital communication system simulation
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Matlab 模拟声波传数，包括基带调制、数字上变频、数字下变频、滤波、译码等-Matlab to simulate the sound wave number, including baseband modulation, digital frequency conversion, digital frequency conversion, filtering, decoding, etc
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单频估计kay算法的仿真源程序，系统为QPSK调制，信道为高斯白噪声信道。-Single frequency estimate kay algorithm simulation source code, the system is QPSK modulation, the channel is Gaussian white noise channel.
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4元FSK调制输出功率谱，基带码元传输间隔0.1s，FSK调制参数的频率间隔分别设置为5HZ和20Hz，-4 yuan FSK modulated output power spectrum, the baseband symbol transmission interval of 0.1s, the frequency interval FSK modulation parameters are set to 5HZ and 20Hz,
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仿真4-PAM载波调制信号在AWGN信道下的误码率和误比特率性能，并与理论值相比较。假设符号周期为1s，载波频率为10Hz，每个符号周期内采样100个点。
-Simulation 4-PAM modulation signal in AWGN channel bit error rate and bit error rate performance, and compared with the theoretical value. Assuming symbol period for 1s
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This a model of a QPSK modulation system for transmission over a bandpass channel with fc = 100 Hz and B = 30 Hz and AWGN at the receiver. SRRC fi lters with excess bandwidth α = 0.18 are employed. The receiver includes an NDA timing recovery lo
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