diversitySC

LDPC codes 4girth check

当今世界电子对抗日益激烈，对于雷达低截获和抗干扰能力的研究越来越受到关注。OFDM (Orthorgonal Frequency Division Multiplexing，正交频分复用)雷达具有大时宽带宽积、波形设计方法灵活、频谱利用率较高以及低截获性能好的特性，因此逐渐成为雷达领域的重点研究方向。除此之外，OFDM信号时域和频域波形都比较复杂，当雷达信号采用OFDM技术时，敌方很难精确估计发射信号波形和瞬时频率，使得截获机不容易分析出检测到的雷达信号。当面对敌方的欺骗式干扰时，对于同样具有大时宽带宽积的线性调频信号，OFDM信号具有更好的抗欺骗式干扰的性能，因此OFDM技术在雷达上的运用愈来愈得到关注。(As electronic warfare becomes increasingly fierce, low intercept probability radar has become an important research filed in electronic countermeasures. OFDM (Orthorgonal Frequency Division Multiplexing) radars have gradually emerged due to their high spectrum efficiency, large time-bandwidth product, flexible waveform design methods, and low intercept probability.In addition, because of the complex time-frequency characteristics of the transmitted signal in OFDM radar, the enemy is difficult to estimate the transmitted signal waveform and instantaneous frequency.When faced with enemy deception interference, OFDM signals have better anti-spoofing performance for LFM signals that also have a large time-bandwidth bandwidth product. Therefore, the use of OFDM technology in radar is attracting more and more attention. .)

运用matlab搭建了MIMO—OFDM系统，并仿真了该系统在awgn信道，平坦衰落和多径信道下的误码率。(Using matlab built a MIMO-OFDM systems, and simulation of the system in awgn channel, flat fading and multipath channel BER.)

说明：  简单的时延波束形成算法，实现简单，并画出指向性图(Simple delay beamforming algorithm)

关于阵列信号处理窄带DOA估计的MATLAB仿真程序，用于学习比较（Capon,convention,MUSIC,DML）(Narrowband array signal processing for DOA estimation of the MATLAB simulation program for learning more (Capon, convention, MUSIC, DML))

使用matlab的LDPC编码，映射为64QAM，软解调(ldpc coding whic is very good)

My Fetion 实现PC客户端通过FETION WEB URL 发送短信( My Fetion)

验证可用，MinkowskiMethod算法 ,计算一维光子晶体的透射特性和反射特性。( Verification is available, MinkowskiMethod algorithm, Calculated transmission characteristics and reflection characteristics of the one-dimensional photonic crystals.)

说明：  均匀平面天线阵列的三维极化方向图，matlab语言。(Antenna Polarization for Uniform Planar Array)

说明：  多频移键控，水声通信代码，实现水下通信。。(Multi-frequency shift keying, underwater acoustic communication code, underwater communication)