通信系统解调中载波锁相环的设计

optimal coverage problem of wireless sensor network

MSK modulation using Simulink

qpsk完整解调，包括载波同步，位同步采用迟早门，载波同步采用判决反馈(qpsk complete demodulation, including the carrier synchronization, bit synchronization using the door sooner or later, the use of decision feedback carrier synchronization)

说明：  本程序为一宽带波束形成程序，基于二阶锥规划求解。可以直接运行，但使用者必须提前下载并安装CVX凸优化工具包。(This program is a broadband beamforming program based on second-order cone programming. It can run directly, but users must download and install the CVX convex optimization toolkit in advance.)

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：  D2D通信中开环功控的演示，并对其进行编译(Demonstration of open-loop power control in D2D communication)

短信群发系统，在一些业务范围广泛的公司中，当公司有了新的通知要告诉在外地的员工，通常使用拨打电话的方式，这样虽然能把事情说清楚，但是当在外的员工比较多时，工作量很大，为了解决这个问题，可以开发一个企业短信群发管理系统。企业短信群发管理系统主要利用硬件短信猫发送短信，并且可以查看SIM卡中收到的短信。(Mass messaging system, in a number of business a wide range of companies, when the company has a new notification to tell the staff in the field, normally used by calling the way, so although things can make it clear, but when the staff out for a long time compared , the heavy workload, in order to resolve this problem, can develop an enterprise management system for mass text messaging. Short Message management system for enterprises mainly use the hardware to send SMS text messages a cat and can view the SIM card text messages received.)

iec103 规约上位机源代码，喜欢的就下吧。(iec103 Statute of the host computer source code, like on the next bar.)

信源产生、信道编码、调制、信道传输、解调、信道译码、差错比较等通信过程的Simulink仿真方法。分析几种调制方式（2FSK、2PSK、QPSK、16PSK、16QAM）在不同信噪比下的通信质量。(Generated source, channel coding, modulation, channel transmission, demodulation, channel decoding, error comparison of the communication process of the Simulink simulation. Analysis of several modulation (2FSK, 2PSK, QPSK, 16PSK, 16QAM) in different SNR communication quality.)

现代通信系统， 基于MATLAB的仿真，利用MATLAB学习通信原理(Contemporary Communication Systems Using MATLAB)