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A Hybrid Orthogonal Frequency Division Multiplexing & Code-Division Multiple-Access (OFDM-CDMA)
This is a simulation program for uncoded OFDM-CDMA system with QPSK modulation
and Complex channel modelled by Rayleigh fading. The program is modifie
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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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OFDM is a frequency-division multiplexing (FDM) scheme used as a digital multi-carrier modulation method. A large number of closely spaced orthogonal sub-carrier signals are used to carry data on several parallel data streams or channels.
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程序1：周期信号（方波）的展开
程序2：用图形表示DSB调制波形及其包络线
程序3：通过傅里叶变换找出被随机信号淹没的信号频率
程序4：DSB-AM 双边带幅度调制和解调
程序5：AM调制和解调-Procedure 1: periodic signal (square wave)
Program 2: graph DSB modulation waveform and its envelope
Application 3: through the Fourier tran
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full DSB-SC Modulation- Demodulation Process. The input arguments are given below:
• Input Signal Frequency: 10Hz
• Carrier Frequency: 15Hz
• Sampling Frequency: 100Hz
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GMSK信号调制和解调的仿真代码，包含一比特差分、2比特差分、鉴频等常用GMSK解调方案。-Modem matlab file for GMSK modulation and demodulation. The demodulation methods including one-bit differential and two-bit differentian decoding and frequency discrimination.
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AM调制和解调的整个过程，同时有频域和时域的波形-The whole process AM modulation and demodulation, while the frequency domain and the time domain waveform
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产生脉内Frank相位编码调制信号，并对其进行平方、四次方变换，利用四次方FFT结果为单频信号的特点完成调制识别，最后绘图观察其瞬时相位曲线。-Generating pulse code modulation signal within Frank polyphase, and its square, four square transformed by FFT results for the fourth power single-frequency signal modulation cha
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对DQPSK调制解调技术的FPGA实现进行了比较全面的研究，利用nQpSK调制技术实现了码速20oKbps的调制器。调制载频3.2MHz、带宽18oKHz、带外抑制大于45dB，调制器设计达到预定要求。解调器硬件完成，软件未全部实现，但完成了CIC滤波器、载波跟踪环、位定时同步、并串转换等几个关键模块的设计。对解调器做了实验测试，验证了相关模块设计的正确性，解调器中重要的载波同步功能己能实现-DQPSK modulation and demodulation techniques for FPG
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WIMAX_WZ_withencoding:信道估计，相位噪声补偿，频偏估计，编解码都有
WIMAX_WZ_withoutencoding：在上面的工程基础上，去掉编解码部分
WIMAX_WZ_withoutprocessing：在上面的工程基础上，再去掉相位噪声补偿，频偏估计
WIMAX_WZ_withoutprocessing2：在上面的工程基础上，改用新的前导和导频联合信道估计方案,参考文档《基于802_16d标准的OFDM信道估计技术的研究与实现.kdh》
因为白噪
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该程序仿真了基于三相逆变器的空间矢量PWM。可以在示波器上看到线电压，相电压和滤波电压。调制指数、DC电压和频率参数可以修改。-The program simulates the vector PWM space-based three-phase inverter. You can see the line voltage, phase voltage and filtering the voltage on an oscilloscope. Modulation index, DC volt
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数字调制信号的产生与识别。产生数字调制信号，并汇出图像，比较直观。
通过分析解调的幅度、频率、相位来判断该信号的调制类型。-Generation and identification of digital modulation signals. Generates a digital modulation signal, and export the image, intuitive.
To determine the modulation type of the signal thro
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通信系统中数字调制信号分析 包括时域、频域、误码率、信噪比、谱分析、加性高斯白噪声，实现一个完整的系统分析的MATLAB程序-Communication systems digital modulation signal analysis including time domain, frequency domain, bit error rate, SNR, spectrum analysis, additive white Gaussian noise, to achieve a compl
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Long-Term Evolution (LTE) is a new standard speci ed by 3GPP for fourth generation (4G)
wireless communications. LTE provides high spectral eciency, high peak data rates, short
round trip time, and frequency
exibility. It relies on the follow
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双边幅度调制与解调
对频率为30Hz的余弦信号进行双边带幅度调制，载波频率为300Hz，并采用相干解调法实现解调-Bilateral amplitude modulation and demodulation cosine signal of 30Hz frequency double sideband amplitude modulation, carrier frequency is 300Hz, and the use of law to achieve coherent demo
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方波，正弦波，三角波可调频调幅多功能信号发生器-Fang Bo, sine wave, triangle wave, multi function signal generator frequency and amplitude modulation
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用脉冲宽度按正弦规律变化而和正弦波等效的PWM波形即SPWM波形控制逆变电路中开关器件的通断，使其输出的脉冲电压的面积与所希望输出的正弦波在相应区间内的面积相等，通过改变调制波的频率和幅值则可调节逆变电路输出电压的频率和幅值-With pulse width according to the sine law of change and equivalent sine wave inverter PWM waveform of SPWM waveform control circuit swit
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OFDM/OQAM调制解调源码，另外增加了上变频部分，中心频率30KHz-OFDM/OQAM modulation and demodulation ，also include up frequency to 30Khz
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通信原理课程设计DSB调制MATLAB源程序-Amplitude modulation of a carrier wave normally results in two mirror-image sidebands. The signal components above the carrier frequency constitute the upper sideband (USB), and those below the carrier frequency constitute the
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matlab实现了OFDM功能，ACO-OFDM可以在可见光中使用。-Orthogonal frequency division multiplexing (OFDM)
is a modulation technique which is now used in most new and
emerging broadband wired and wireless communication systems because it is an effective solution to in
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