modbus

此文件为一仿真机的压缩文件，主要是针对解决光通信系统里面传输过程中的非线性补偿而写的代码，可以有效的补偿光在光纤里面传输的非线性。(This file is a compressed file of an emulator, which is mainly written to solve the nonlinear compensation in the transmission process of the optical communication system, and can effectively compensate the nonlinearity of light transmission in the optical fiber.)

OPNET仿真程序。LEACH算法在传感器网络中的实现。OPNET在无线传感器网络中的实现程序还是比较少见的。(OPNET simulation program. LEACH algorithm in sensor networks. OPNET implementation of procedures in wireless sensor networks is still relatively rare.)

socket 编程(socket programming)

航空航天通信技术一般采用模拟通信的频率调制和数字通信的移相键控调制方法。这有利于充分应用信道带宽和能源。频率调制是在一定程度上改变载波或副载波的频率来传输信息的调制方法。移相键控调制是利用载波或副载波的相位跳变来传输信息的调制方法。移相键控又分二相移相键控、四相移相键控和多相移相键控，其中以四相移相键控和八相移相键控调制方法的效率较高(Aerospace communications technology commonly used analog communication of frequency modulation and the digital communication phase shift keying modulation method. This is helpful for making full use of channel bandwidth and energy. Frequency modulation is changed to some extent carrier or subcarrier frequency to transmit information modulation method. Phase shift keying modulation is the use of carrier or subcarrier phase jump to transmit information modulation method. Phase shift keying and binary phase shift keying, four phase shift keying and multiple phase shift keying, of which four phase shift keying and eight phase shift keying modulation method of high efficiency )

说明：  一种PC与单片机多机RS232串口通信设计应用(A PC with a single-chip multi-machine RS232 serial communication design application)

基于压缩感知的MASSIVE MIMO信道估计，采用OMP算法解决稀疏信道估计问题。MASSIVE MIMO多小区多用户模型，合成稀疏信道（有效解决导频污染）。(Based on compressed sensing for MASSIVE MIMO channel estimation, OMP algorithm is used to solve the sparse channel estimation problem. MASSIVE MIMO multi cell and multi-user model, to synthesize sparse channel (effectively solve pilot pollution).)

First, when the inter-user distance d is small, the SNR for D2D communication is high, and hence there are sufficient number of bits for high quality CSI exchange.

说明：  载波相位平滑伪距，针对伪距的异常情况，利用载波相位进行平滑处理(Carrier phase smoothing pseudo-distance)

说明：  点亮led流水灯，通过调用锁相环，可以更改对应的时钟。(Lighting the LED pipelining lamp, the corresponding clock can be changed by calling the phase-locked loop.)

In this paper, we present and analyze efficient frame synchronization and frequency offset compensation scheme with ternary sequences for an orthogonal frequency division multiplexing (OFDM) system in Rayleigh fading channels. Frame synchronization is an essential procedure for normal operation of the OFDM system because of sensitivity to synchronization errors. And when there are frequency offsets in OFDM frame, the loss of orthogonality occurs and the interference problem among several subcarriers is introduced. These fact leads to the requirement for joint implementation of the frame synchronization and frequency offset compensation.