a_project_of_mobile_compny

OFDM峰均比抑制程序，包含代码对应的文章，方便理解(The OFDM PAPR inhibition program, contains the code that corresponds to the article, easy to understand)

使用matlab中的通信工具箱中simulink搭建直接序列扩频系统并进行仿真，(The direct sequence spread spectrum system is built and simulated by using Simulink in the communication toolbox of MATLAB.)

说明：  包含有数字通信课程实验大作业报告与代码。完成的OFDM的收发包含：1.卷积编码、2.自动增益控制、3.极大似然判决、4.QPSK收发、5.帧检测等，代码在MATLAB2016b环境下编译通过(It contains the report and code of the experiment assignment for the course of digital communication. The completed OFDM transceiver includes: 1. convolutional coding, 2. automatic gain control, 3. maximum likelihood decision, 4. QPSK transceiver, 5. frame detection, etc. The code is compiled and passed in MATLAB2016b environment.)

SIGNAL DETECTION FOR SPECTRUM SENSING Spectrum sensing is a critical functionality in cognitive radio communications as it must be performed before allowing unlicensed users to access a vacant licensed band. Energy detector is also known as radiometer and it is most common method of spectrum sensing because of its low computational and implementation complexities. The coherent detector, also referred to as a matched filter, can improve detection performance if the primary transmitted signal, s, is deterministic and known a priori.

说明：  基于均匀线阵的强干扰条件下弱信号的DOA估计，采用MUSIC算法(Based on the DOA estimation of weak signal under strong interference of uniform linear array, music algorithm is adopted)

该论文针对光纤传感系统，深入研究随机信号的互相关函数和基于AR模型的功率谱估计，设计出具有事件发生检测功能的传感器信号处理算法。(The paper for the fiber optic sensor system, in-depth study of the cross-correlation function of random signal-based AR model spectrum estimation, designed with the incident detection sensor signal processing algorithms.)

SOFTWARE FOR ENGINEERS

说明：  In order to solve the problem of low bandwidth utilization while the peak-to-average power ratio(PAPR) is reduced.

收发传真，浏览传真的程序(A program which receive、send and scan fax)

说明：  多径信道的生成函数 ，瑞利多径衰落信道生成。(Multipath channel generate. This function generates a uncorrelated multipath Rayleigh fading matrix.)