多径干扰下ofdm仿真

说明：  实时声音采集，双通道采集声音信号，并且进行降噪处理和FFT变换(Real time sound acquisition)

说明：  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. .)

说明：  A Study on OFDM Mobile Radio Transmission Scheme with Adaptive Guard Interval Length

OFDM信道的参数估计模拟。QDPSK调制，采用训练信号。(OFDM channel estimation simulation.)

说明：  该MATLAB用以计算LTE下行业务数据在高斯信道下QPSK的误码率(The MATLAB is used to calculate the error rate of QPSK of LTE downlink data in Gaussian channel)

Walsh码在CDMA中的具体说明及应用(Walsh code specific instructions and application in CDMA)

this project simulate the voice communication between two subscriber stations in office scaled module and test the communications between them

说明：  构建了基于压缩感知的信号处理系统，并用BPDN算法将频域稀疏信号恢复出来，BPDN算法与GPSR算法类似，属于基追踪算法，复杂度较高但较为精准。(A signal processing system based on compressed sensing is constructed, and bpdn algorithm is used to recover the sparse signal in frequency domain. Bpdn algorithm is similar to GPSR algorithm, which belongs to base pursuit algorithm, with higher complexity but more accurate.)

光通信OFDM系统下的ACO-OFDM和DCO-OFDM系统实现和比较( U5149 u901A u4FE1OFDM u7CFB u7EDF u4E0B u7684ACO-OFDM u548CDCO-OFDM u7CFB u7EDF u5B9E u73B0 u548C u6BD4 u8F83)

大规模MIMO信道容量分析，主要分析了BS和MS天线数不断增大时，对信道容量的影响。(The analysis to Massive MIMO channel capacity as the antennas of BS and MS grow up. )