gt_0.6.4

说明：  对2ask、2psk、2dpsk、2fsk的调制仿真(Modulation simulation of 2ASK, 2PSK, 2DPSK and 2FSK)

Simulates nonlinear effect in optical fiber called Cross Phase Modulation for symmetric regime

利用连续两张图片中莫尔条纹实现位移测量，对条纹区域像素灰度值采用正弦函数拟合(Moire fringe displacement measurement in two consecutive pictures, fitting the gray value of pixels in fringe region with sinusoidal function.)

complete code with various mimo detectors:sphere decoder,vblast,ZF,ML

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.

gps软件接收机c/a码的捕获，可用于ca码的直接捕获(gps software receiver c/a code capture, ca code can be used to directly capture)

找出一个向量或者数组的所有子集，数组中所有向量的全部组合排列组成的子集(Find a subset of the array)

基于波数积分方法对水下声场的分析，计算水声传播的时域波数积分程序(Analysis of underwater acoustic field based on wavenumber integral method)

《GPS应用程序设计》李洪涛著，学习GPS编程非常好的一本书，囊括了GPS编程的所有内容(" GPS application design," Li Hongtao with, learning GPS programming a very good book, GPS programming encompasses all content)

是一篇国外的图形文章代码，将输入图像的2D轨迹转化为3D图形(Is a foreign article graphics code will be entered into 2D images into 3D graphics trajectory)