LDPC

说明：  通过C++语言实现了OFDM系统的仿真，包裹调制、子载波映射、循环前缀、频域时域映射，解调等等，代码简单易懂(The simulation of OFDM system is realized by C + +, including package modulation, subcarrier mapping, cyclic prefix, frequency domain time domain mapping, demodulation and so on. The code is simple and easy to understand)

4FSK调制解调的matlab代码。采用相干解调的方式4FSK进行解调，与大多数方案的包络检波不同。基带信号用四种电平来表示，与调制信号相区分。(Demodulation matlab code 4FSK modulation. Coherent demodulation 4FSK demodulates Unlike most programs envelope detector,. The baseband signal is represented with four level distinguish phase with the modulation signal.)

完成对cmw500测试仪器的程控及初始化操作(Novice is currently in the learning stage. CMW500 GSM non-signaling test program example, including initialization)

说明：  2. 关于无线信道的多普勒谱，请回答以下问题： (1) 在某些无线信道中，多普勒频移会引起无线信道输出信号的混叠。请描述产生混叠的各种原因； (2) 无线信道中的多普勒谱有一种经典谱(classic spectrum)，请解释产生这种谱形状的机理； (3) 请用Simulink工具编写代码(S-Function方式)，产生一单径瑞利信道，其多普勒谱为经典谱，其中移动速率为120km/h。并请描述：自己用计算机产生的经典谱是正确的依据。(2. Regarding the doppler spectrum of the wireless channel, please answer the following questions: (1) in some wireless channels, doppler frequency shift will cause aliasing of the output signals of the wireless channel.Describe the various causes of aliasing; (2) there is a classic spectrum in the doppler spectrum in the wireless channel, please explain the mechanism of producing this spectrum shape; (3) please use Simulink tool to write code (s-function mode) to generate a single-path Rayleigh channel, whose doppler spectrum is the classical spectrum, in which the moving rate is 120km/h.And please describe: your own computer generated classical spectrum is the correct basis.)

说明：  实现蒙特卡罗分析，可以直接调用进行对误码率等数字通信的相关参数分析(The realization of the Monte Carlo analysis, can directly call on the bit error rate for digital communications, such as analysis of relevant parameters)

说明：  基于matlab实现OFDM，调制方式为QPSK，可以对信道的状态进行估计(OFDM is realized based on MATLAB, the modulation mode is QPSK, and the channel state can be estimated)

说明：  很久很久之前，收藏的一份 清华大学 p2p相关的研究文献，希望对有需要的人有帮助，非常难得(Long, long ago, a collection of P2P-related research literature collected by Tsinghua University, hoping to help people in need, is very rare.)

仿真了恒虚警的平均单元算法，给出仿真结果，同时分析了不同窗口数对虚警率和检测率的影响，并写了详细的注释(The constant false alarm average cell algorithm is simulated, and the simulation results are given. Meanwhile, the influence of different window numbers on false alarm rate and detection rate is analyzed, and detailed annotations are written.)

Modulation ASK, OOK, BPSK, QPSK, 8PSK Digital modulation techniques

说明：  一个简单的verlog HDL教程，内容比较详细，可读性较高。(A simple verlog HDL tutorial, more detailed content, high readability.)