tracking

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：  以上给出了基于高频地波雷达的海杂波仿真，可以显示其两种峰值的状态，以及海杂波的情况(the code of HFSWR Distribution Sea Clutter program this code can show the real state of HFSWR)

石墨烯的结构编程图,这是费了工作人员很长时间才完成的。(The figures of graphene)

在OFDM系统下，仿真多径衰落与理论高斯衰落的误码率与其理论误码率的比较(In OFDM system, the bit error rate of simulated multipath fading and theoretical gaussian fading is compared with that of theoretical gaussian fading)

读取MIT-BIH数据库，每个人的心电数据。(Read the MIT-BIH database, everyone' s ECG data.)

Polar码学习。实际测试BER特性基本与文献Kai Niu;?Kai Chen;?Jiaru Lin;?Q. T. Zhang, ?Polar?codes:?Primary?concepts?and practical decoding 　　algorithms,IEEE Communications Magazine 一致(this is about polar code)

说明：  单频、宽带信号的线阵、面阵波束形成，用的是fft能量或者幅度求和的做法(Beamforming of linear array and area array for single frequency and broadband signals)

应用虚拟激励法和振型分解反应谱法分析不同的结构，很有用(Application of pseudo excitation method and mode decomposition response spectrum method)

说明：  对mimo-ofdm系统的仿真，适合初学。(A simulation of MIMO-OFDM system is suitable for beginners.)

应用labview实现信号的改进经验模态分解，对初学者有所帮助(Labview is applied to realize the improved empirical mode decomposition of signal, which is helpful for beginners)