Cognitive Radio matlab code

基于OPNET的卫星通信程序，为Opnet网络仿真书籍的实例(based satellite communications procedures for Opnet Network Simulation examples of books)

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.

高动态模型，加加速度，加速度和速度都可以改变，仿真出多普勒频偏变化和相位变化。(High dynamic model of acceleration, acceleration and speed can be changed, the simulation of doppler frequency and phase changes.)

说明：  完整的Verilog验证模型，包括设备完整的状态。(Complete verilog Verification Model)

MODBUS通信协议，用VC6.0调试通过，非常好用，做上位机用这个很好(MODBUS communication protocol with VC6.0 debugging through, very easy to do well with this PC)

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

Massive MIMO Research Work.

利用C++实现的一个即时通讯系统的客户端。传输层采用的是TCP协议。这是本科时候的毕业设计，最后评定为优，希望对一些朋友能有所帮助。(The use of C++ implementation of an instant messaging system client. Transport layer protocol used is TCP. This is the time of undergraduate graduation project, and finally classified as gifted, in the hope that some of my friends can be helpful.)

GSM链路级仿真程序，按照基本GSM规范编写而成。(GSM link level simulation program, written in accordance with the basic GSM standard.)

VS2008下数据采集系统源码，主要实现实时采集下位机的数据，并实现曲线绘制和历史数据查询的功能(VS2008 under data acquisition system source code, mainly to achieve real-time acquisition the lower machine data, and curve drawing and historical data query functions)