tongxinxitong

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：  多子带自适应算法，能够有较好的鲁棒性以及稳态特性。(The multi-subband adaptive algorithm has better robustness and steady-state characteristics.)

串口程序，用于通过串口控制空调，可以在这个程序基础上修改其他代码(used for serial port)

有客户端的聊天软件，可实现网络通讯，对于了解网络编程有帮助(A client chat software, network communications, network programming help for understanding)

CSMA/CA 协议吞吐量与站点数量的分析，注释较详细(CSMA/CA protocol throughput and the number of stations a more detailed analysis, annotation)

说明：  repeat-accumulate codes (RA codes)

说明：  MATLAB code for power allocation in V2X networks using SDR and beamforming

说明：  CANOpen-CanFestival-2.03

进行信号积累时，有的信号存在多普勒频率，不利于累加。该程序可完成对信号多谱勒频率的补偿。(Signal accumulation, some signal Doppler frequency, is not conducive to the accumulation. The program can be complete compensation of the signal Doppler frequency.)

MIMO的MATLAB的无线通信仿真模型：3GPPP推荐模型SCM ，经测试可直接使用。 (Of MIMO wireless communication of MATLAB simulation model: 3GPPP recommended model for SCM, has been tested and can be used directly.)