ofdm-evm-v2

直扩码分多址DS-CDMA是利用高速的WALSH正交码序列作为地址码，与多用户信息数据相乘得到信息数据的直接扩频信号，再经过BPSK调制后发送出去，经过AWGN无线信道的传输后，在接收端与本地产生的地址码进行相关检测，从中将地址码与本地码一致的用户数据选出，把不一致的用户数据删除。(DS-CDMA DS-CDMA is the use of high-speed WALSH orthogonal code sequences as address code, with multi-user information data has been multiplied by the direct spread spectrum data information signal, and then after a BPSK modulated sent through AWGN channel after transmission, at the receiving end with the locally generated address code associated Detect, which will address code with local codes consistent user data elected to delete user data inconsistencies.)

说明：  多径参数干扰下的ofdm系统的matlab仿真代码，可供学习(Matlab simulation code of OFDM system under multipath parameter interference can be learned)

非均匀天线组阵SUMPLE权值信噪比及信号合成性能分析(Non-uniform antenna arraying SUMPLE weights SNR performance analysis and signal synthesis)

圆形阵列的方向图matlab程序，加注释，可以修改相关参数。(The circular array pattern matlab program, plus annotations, can modify the relevant parameters.)

说明：  讨论了变换域通信系统中收发端一致时的系统性能，包括AWGN信道及单音，多音，窄带，扫频干扰(Discussed the transform domain communication system is identical to sending and receiving end system performance, including the AWGN channel and the tone, multi-tone, narrowband, swept-frequency interference)

光纤通信基础知识，介绍了单模，多模光纤的特点(Optical fiber communication based on knowledge, introduction of the single-mode, multimode fiber characteristics)

OFDM系统包括OFDM系统的调制解调，IFFT及FFT变换，保护间隔的加入对系统性能的改善，以及多径干扰、高速移动对系统误码率的影响。(The OFDM system includes modulation and demodulation of the OFDM system, IFFT and FFT transformation, the improvement of the protection interval to the system performance, and the influence of multipath interference and high-speed mobile on the system BER.)

模拟空间多孔介质,用matlab三维曲面重构。(The porous media in the space is simulated, and the three-dimensional surface is reconstructed.)

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仿真对数正态阴影衰落和仿真了一个BPSK通信系统，并与AWGN信道下的理论误码率结果进行了比较(Log-normal Shadowing PL model;Simulate a BPSK communication system, comparing simulated with theoretical BER results under AWGN channel)