timing_GAD_16QAM

16QAM调制解调，包含QAM的调制解调Matlab程序(16QAM modem, including QAM modem matlab program)

说明：  OFDM系统仿真内容，比较简单的说明，希望有用哦。(OFDM Channel estimation)

说明：  采用QAM调制的方式，实现OFDM信号的PAPR的降低，并且提供了由optisystem转换到MATLAB接口的代码(QAM modulation is adopted to reduce the PAPR of OFDM signal, and the optisystem port is provided to convert to MATLAB code)

说明：  DS-CDMA数字基带传输系统+MATLAB仿真图+程序代码(DS-CDMA digital baseband transmission system + MATLAB simulation diagram + program code)

ofdm的编码过程，用evm和比特率进行对比(The encoding process of OFDM is compared with EVM and bit rate)

说明：  opnet网络仿真中文教程，给了我挺大帮助的(OPNET Network Simulation Chinese course, gave me a lot of help)

Polar码学习。实际测试BER特性基本与文献Kai Niu;?Kai Chen;?Jiaru Lin;?Q. T. Zhang, ?Polar?codes:?Primary?concepts?and practical decoding 　　algorithms,IEEE Communications Magazine 一致(this is about polar code)

说明：  BP神经网络信道均衡，matlab的仿真实现(BP neural network channel equalization)

主要讲解了航空信道模型的仿真实现和参数选择，给出了各信道场景下的接收信号星座图以及概率密度曲线。(Mainly on the aviation simulation channel model implementation and parameter selection are given scenarios each channel received signal constellation and the probability density curve.)

说明：  主要包含BPSK信号产生，成形滤波，调制，加噪，下变频，解调(It mainly includes BPSK signal generation, shaping filtering, modulation, noise adding, down conversion and demodulation)