SatellitePosition

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.

差分GPSRTCM解码程序实现，里面有进制转换等代码(Difference GPSRTCM decoding process to achieve, there are hex conversion code)

说明：  极限学习机是由黄广斌在2005年作为一种新的单隐层前馈神经网络提出的，具有与神经网络（NN）相同的全局逼近性质，且其参数学习无需迭代，速度明显快于现有的神经网络。目前在岩性识别、LF终点温度软测量、穿孔机导盘转速测量、软测量建模、图像识别等方面有所应用，但将其用于图像分割中的应用还较少。(Limit learning machine was proposed by Huang guangbin as a new single hidden layer feedforward neural network in 2005. It has the same global approximation property as neural network (NN), and its parameter learning does not need iteration, and its speed is significantly faster than the existing neural network. At present, it has some applications in lithology identification, lf terminal temperature soft measurement, perforator guide plate speed measurement, soft measurement modeling, image recognition and so on, but its application in image segmentation is less.)

一个相对完整的OFDM通信系统的仿真设计，包括编码，调制，IFFT，上下变频，高斯信道建模，FFT，PAPR抑制，各种同步，解调和解码等模块，并统括系统性能的仿真验证了系统设计的可靠性。(OFDM： coding modulation IFFT AWGN Mode FFT ……)

应用于GPS/IMU组合导航系统的MATLAB代码。(The MATLAB code is applied to GPS/IMU integrated navigation system.)

接受分集中采用选择式合并的函数，输出误码率和信噪比曲线(Acceptance of centralized using selective merge function, the output is bit error rate and SNR curve)

阵列信号处理中的自适应波束形成技术，采用线性最小方差准则，加切比雪夫窗处理。(Adaptive beamforming in array signal processing is generated by LCMV criterion and Chebyshev window.)

使用矩形信号16qam通信系统蒙特卡洛仿真 (16qam communication system Monte Carlo simulation)

说明：  经典高斯烟雨模型、固定点源、3d模拟、三维图、等高线图(Classic Gaussian smoke and rain model, fixed point source, 3d simulation, three-dimensional map, contour map)

采用GSM系统的GMSK调制方式，并画出出时频域图，计算BER，有利于了解GSM系统的调制解调。(Frequency domain using the GSM system GMSK modulation and draw the diagram, calculate the BER beneficial for GSM modem.)