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仿真基带数字调制系统实现滚降系数分别为0，0.5，1时信号时域，频域和功率谱密度以及眼图的波形-Simulation-based systems with digital modulation to achieve roll-off coefficients were 0,0.5,1 the signal in time domain, frequency domain and power spectral density and waveform eye diagram
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以高性能数字信号处理芯片TMS320F2812为核心,设计生成了基于不对称规则采样算法的SPWM波形,键盘输入参数设定调制波频率。本文首先分析了不对称规则算法的原理,接着设计了基于TMS320F2812芯片的软件设计流程,最后在数字示波器上显示了实验波形-To high-performance TMS320F2812 digital signal processing chip as the core design is generated based on asymmetric rule sa
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该IC利用的无线频率范围是ISM频带的5.790G～5.840GHz。采用FSK调制方式。集成有上行转换混频器、缓冲器及预驱动器放大器、Fractional-N型（分数型锁相型）频率合成器等-The use of radio frequency IC is the ISM band 5.790G ~ 5.840GHz. Using FSK modulation. Integrated upconverter mixer, buffer and pre-driver amplifier, Frac
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在本系统中，信息序列在先经过FSK调制，经过截止频率为25kHz的低通滤波器后（把信号频率限制在25kHz），再进入混频器搬移到更高的频率发送出去，在接收端，用与发送端同步的跳频信号对其进行变频（跳频的解跳处理在此进行），取下边频，然后进行FSK的解调-In this system, the message sequence prior through FSK modulation, through the cut-off frequency of 25kHz after low-pass fi
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正交频分复用（OFDM）的调制与解调以及OFDM的误码率。-Orthogonal Frequency Division Multiplexing (OFDM) modulation and OFDM demodulation and bit error rate.
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该段程序是AM调制，其中包括调制信号，载波和已调信号的时频分析-The section of program is AM modulation, including modulation, carrier and modulated signals time-frequency analysis
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调制进制：载波频率：信道信噪比
两载频的差值：信道信噪比-Band modulation: carrier frequency: channel SNR difference between the two carrier frequencies: Channel SNR
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pi/4-qdpsk调制解调程序，能有效地进行差分解调和鉴频器解调，在一些不易提取载波的场合很有用。因此，利用仿真来研究系统是必要的。-pi/4-qdpsk modulation and demodulation process, can effectively reconcile the difference solution frequency discriminator demodulation, carrier extraction in a number of difficult si
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设计一个2DPSK数字调制系统，要求：
（1）设计出规定的数字通信系统的结构；
（2）根据通信原理，设计出各个模块的参数（例如码速率，滤波器的截止频率等）；
（3）用Matlab或SystemView 实现该数字通信系统；
（4）观察仿真并进行波形分析；
（5）系统的性能评价。
-Design a 2DPSK digital modulation system requirements: (1) design a digital communication sys
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可以实现二进制振幅键控、二进制频移键控和二进制相位键控的解调和调制功能。-Can achieve binary amplitude shift keying, binary frequency shift keying and binary phase shift keying demodulation and modulation functions.
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此文件为ofdm的matlab仿真程序，详细画出了时域和频域的相关图，以及调制信号的实虚部。-This file is the matlab ofdm simulation program, detailed drawing of the time domain and frequency domain correlation diagram, and the modulation signal real and imaginary parts.
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TCM是把纠错编码与调制相结合的一种技术，将编码与调制作为一个整体同时进行处理，既有纠错能力又有频带压缩能力，基本原则是利用信号集的冗余度来提高纠错能力，从而在不扩展占用频带的前提下提高编码增益。这样就可以在传输功率和带宽都不变的同时提高数字传输系统的可靠性。-TCM is the error correction coding and modulation of a combination of technology, coding and modulation processing as a
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基于MATLAB的语音信号的调制和解调，包括画出各个阶段的语音时域和频域图形-Matlab-based voice signal modulation and demodulation, including draw stages of time domain and frequency domain speech
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MIMO Othogonal Frequency Division Modulation
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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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Abstract—This paper describes a pseudorandom carrier modulation
scheme and its harmonic spectra spread effect. The pseudorandom
carrier of the proposed scheme are produced through
the random synthesis of the two triangular carriers, each of the
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电路中使用了锁相环音频译码器LM567。LM567是一种模拟与数字电路组合器件，其电路内部有一个矩形波发生器，矩形波的频率由5、6脚外接的R、C值决定。输入信号从3脚进入LM567后，与内部矩形波进行比较，若信号相位一致，则8脚输出低电平，否则输出高电平。8脚是集电极开路输出，使用时必须外接上拉电阻。
将LM567第5脚上幅值约为4V的标准矩形波，通过R1引至三极管VT1的基极，使接在VT1发射极的红外线发射管导通并向周围空间发出调制红外光。-PLL circuit used in the
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基于MATLAB的 SSB调制解调实现.利用MATLAB集成环境下的M文件，编写程序来实现SSB的调制解调，并绘制出解调前后的时域和频域波形及叠加噪声时解调前后的时频波形，根据运行结果和波形来分析该解调过程的正确性及信道对信号传输的影响。-MATLAB-based SSB modulation and demodulation to achieve. Advantage of MATLAB M-files integrated environment, programming to achiev
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实现2M数据速率的GMSK调制，时钟频率20M，2分频后作为移位寄存器-2M data rate to achieve the GMSK modulation, the clock frequency of 20M, 2 minutes after a shift register frequency
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直序扩频系统，首先基带信号通过脉冲成型，m序列扩频然后进行BPSK调制发送，接收端接收到信号加干扰和噪声，进行解调和解扩恢复原始信号。- The straight foreword wide frequency system, the first baseband signal through the pulse formation, the m sequence wide frequency then carries on BPSK the modulation transmission, t
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