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用于产生解析信号，产生一个信号的同相和正交分量以及包络和相位-used to produce analytical signal, a signal generated in the same phase and quadrature components and the envelope and phase
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利用matlab仿真软件，实现8QAM调制。在实现时采用正交调幅的方式,某星座点在I坐标上的投影去调制同相载波的幅度,在Q坐标上的投影去调制正交载波的幅度,然后将2个调幅信号相加就是所需的调相信号。-Use of matlab simulation software to achieve 8QAM modulation. In achieving the adoption of quadrature amplitude modulation means of a constellation in
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雷达信号处理部分，包括正交相干检波、脉冲压缩、多普勒处理和恒虚警检测。-Radar signal processing parts, including the quadrature coherent detection, pulse compression, Doppler processing and CFAR detection.
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An 8-QAM communications channel simulation in Simulink, constructed from a 16-QAM model and using an I,Q correlation receiver.
QAM (quadrature amplitude modulation) is a method of combining two amplitude-modulated (AM) signals into a single chan
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Quadrature amplitude modulation (QAM) is a modulation scheme in which two sinusoidal carriers,
one exactly 90 degrees out of phase with respect to the other, are used to transmit data over
a given physical channel. One signal is called the I sign
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QPSK调制全称Quadrature Phase Shift Keying ,意为正交相移键控，是一种数字调制方式。数字信号的四相相移键控调制与解调技术以其灵活性和通用性而得到广泛的应用，符合未来数字通信技术发展的方向。随着移动通信技术的发展，以前在数字通信系统中采用FSK、ASK、PSK等调制方式，逐渐被许多优秀的调制技术所替代。-QPSK modulation partial Quadrature Phase Shift Keying, Quadrature Phase Shift Keyi
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Generation of ASK:
Amplitude shift keying - ASK - in the context of digital communication is a modulation process which imparts to a sinusoid two or more discrete amplitude levels 1. These are related to the number of levels adopted by the digit
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5、绘制散点图。
对发射和接收信号利用scatterplot函数可显示信号星座图的样子及噪声对信号造成的失真程度。在该图中，横轴代表了信号的同相分量而纵轴代表了正交分量。下面的代码还利用了
对接收信号利用modem.deqammod对象的demodulate方法进行解调。解调结果为包含0到15之间整数的列向量。
-5, draw a scatter plot. The transmitted and received signals can be displayed using a
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QAM信号的生成程序（正交振幅调制，其幅度和相位同时变化）- QAM Signal generation Quadrature amplitude modulation, changes in the amplitude and phase at the same time
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信号分为同相信号和正交信号，分别进行正交采样，降低采样率，搬移频带，完成采样。-Signal into in-phase signal and the quadrature signal, respectively, quadrature sampling, the sampling rate decrease, moving band, complete sampling.
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tA scheme of format conversion optical 16-ary quadrature amplitude modulation (16QAM) toquadrature phase shift keying (QPSK) signal based on cascaded four-wave mixing (FWM) in semiconduc-tor optical amplifiers (SOAs) is proposed. Theoretical analysis
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本系统是基于零中频正交解调原理的简易频率特性测试仪，用于检测被测网络的幅频特性和相频特性。该系统主要包括DDS集成模块，RLC串联谐振电路，乘法器电路，低通滤波器，同相放大器和测量显示模块，其中RLC串联谐振电路作为被测网络。本系统以DDS
集成模块为核心，将其产生的正交扫频信号通过被测网络后，经乘法器得到高频信号；这两个信号经过低通滤波、同相放大后得到符合要求的I、Q直流分量；最后通过单片机进行ADC
采样、数据处理和液晶显示，得到被测网络的幅频特性和相频特性。本系统在算法上的创新之处
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这个问题的目标是开发一个移动通信瑞利衰落信道模拟器使用方法,基于过滤高斯过程,基于同相正交PSDs,开发仿真代码来生成一个瑞利衰落信号。采样率应该至少1000样本/秒-The goal of this problem is to develop a Rayleigh fading simulator for a mobile communications channel using the method based on filtering Gaussian processes based on
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第一个程序为模拟产生一个正态随机序列X(n)，画出产生的随机序列波形、相关函数（与理论曲线对比）
和功率谱密度。第二个程序为产生一个信号X(n)，绘出信号及其幅度频谱曲线，当中心频率向左搬移f0＝200Hz时，求出其低通等效信号，并绘出其幅度频谱、信号的同相、正交分量及包络。当中心频率向左搬移f0＝100Hz时，求出其低通等效信号，并绘出其幅度频谱、信号的同相、正交分量及包络。-The first program to simulate the amount of generating a
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Function bpsk_mod (x, L, SNR, pulse, theta, phi)
Function that implements a bandpass signal generator in
Phase and quadrature.
Input Parameters:
1.- X = bit sequence
2.- L = oversampling factor
3.- SNR = signal-to-noise ratio at
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Quadrature Amplitude Modulator (QAM) in digital communication system, generation of Quadrature Phase Shift Keyed (QPSK or 4-PSK) signal and demodulation. Introduction: The QAM principle: The QAM modulator.
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The digital simulation system using MATLAB to illustrate the
Quadrature Amplitude Modulation (QAM). QAM is a modulation scheme to convey two digital bit
streams which can be converted to symbol signals by modulating the amplitudes and the phase of
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