PSD_estimators

在LDPC译码中用LLR方式,跌代次数分别为5和10对译码性能的影响MATLAB写的()

一个OFDM在加性高斯白噪声信道(AWGN)和多径瑞利衰落信道(MuhipathReyleighFading)下的调制解调模型，simulink建模，仿真信噪比、频谱图、星座图。(A OFDM in additive white gaussian noise (AWGN) channel and multipath Rayleigh fading channel (MuhipathReyleighFading) of demodulation model, simulink modeling, simulation SNR, spectrum diagram, constellation chart. )

Modbus4J源代码，方便大家查看具体的协议内容(Modbus4J.rar is a file that describes how control the PLC by Java language)

说明：  进行FDOA频差定位的程序，计算GDOP(Carry out FDOA frequency difference positioning program and calculate GDOP)

建立了直接序列扩频系统的matlab仿真模型，在信道中存在高斯白噪声和干扰的情况下，对系统的在不同扩频增益下的误码率性能进行了仿真及分析，分析了扩频码的自相关性、误码率、性噪比。(A matlab simulation model of the direct sequence spread spectrum system, the existence of Gauss white noise and interference in the channel under the condition of the system in different spreading gain the BER performance of the simulation and analysis, analysis of PN code autocorrelation, BER, SNR)

说明：  单频信号经过多径时变信道后，输出信号的包络随时间随机起伏，输出信号的频谱从冲激谱变成一个窄带频谱。径数位20，变化频率从0—2HZ随机均匀抽取。(Single-frequency signal through time-varying multipath channel, the output signal envelope random fluctuations over time, the output signal from the impulse of the spectrum into a narrow-band spectrum spectrum. Digital Drive 20, changes in frequency from 0-2HZ uniform random samples.)

该程序可以实现多个客户端互相通讯，如同聊天室(Multiple clients can communicate with each other, just like chat rooms)

Characterization of Raman-assisted Fiber Optical Parametric Amplifiers Gain

这段程序是相干光通信系统的仿真机，可以用matlab来仿真相干光通信系统，具体的参数可以在代码里面自行修改。(This program is a simulation machine for coherent optical communication systems. Matlab can be used to simulate a coherent optical communication system. The specific parameters can be modified in the code.)

说明：  通信系统MATLAB例程 来自MATLAB通信系统仿真(matlab signal communication)