ACCF

AM调制与解调，信息信号和载波信号经过AM调制并加噪得到AM信号的频谱，再经过带通滤波器，相干解调，低通滤波后得到解调后的信号。(AM modulation and demodulation, information signal and carrier signal through AM modulation and noise to get the spectrum of AM signal, then through band-pass filter, coherent demodulation, low-pass filter to get the demodulated signal.)

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.)

电话集团交换机的一些组成部分和工作原理,了解交换机的基本常识()

Abstract—In this paper, we study the joint estimation of inphase and quadrature-phase (I/Q) imbalance, carrier frequency offset (CFO), and channel response for multiple-input multipleoutput (MIMO) orthogonal frequency division multiplexing (OFDM) systems using training sequences. A new concept called channel residual energy (CRE) is introduced. We show that by minimizing the CRE, we can jointly estimate the I/Q imbalance and CFO without knowing the channel response. The proposed method needs only one OFDM block for training and the training symbols can be arbitrary. Moreover when the training block consists of two repeated sequences, a low complexity two-step approach is proposed to solve the joint estimation problem. Simulation results show that the mean-squared error (MSE) of the proposed method is close to the Cramer-Rao bound (CRB). Index Terms—MIMO OFDM, CFO, I/Q imbalance, channel estimation.

说明：  5G NR 的全链路仿真C代码，对学习5G算法和做5G研发的有很大的参考价值。(5g NR full link simulation C code has great reference value for learning 5g algorithm and doing 5g research and development.)

完整的射频门禁程序源码包含rc522的驱动程序以及相应的显示程序(There had been many cases about RFID-based access control systems. In this paper, long-distance radio frequency technology was used and image-recognition technology was joined, these technologies were used to realize the automation of access management.)

THIS IS A PROJECT OF A MOBILE COMPANY

说明：  Simulation of a UWB transmitter implementing PAM with TH div hr(Simulation of a UWB transmitter implementing PAM with TH div h)

一个用于高阶调制单载波系统的低复杂度均衡算法，非常有用(a low-complexity equilization algorithm which can be applied in single-carrier systems wiht high order modulation)

用matlab完成正交频分复用ofdm系统的信号发射与接收仿真(ofdm communication using matlab)