fast_near_xcorr

this is watermark source code. it is good for making programming

this code useful for padding zeros in ofdm.it is the function used in ofdm_ber file.

说明：  求解大规模无约束最小化问题，使用信赖域算法，其中信赖域子问题使用截断共轭梯度法(The trust region algorithm is used to solve the large-scale unconstrained minimization problem, in which the truncated conjugate gradient method is used for the trust region subproblem)

QPSK调制代码,高斯和瑞丽衰落信道后的信号波形(QPSK　Modulation)

说明：  下面的程序是求多项式y=x^6-10x^5-26x^4+344x^3+193x^2-1846x-1680在区间[-8,8]的最小值，误差不超过0.001。对于这个复杂的多项式，可先用matlab绘制函数的大概曲线，确认函数的最小值大概处于[-8,8]之间，再用本程序求出精确解。 (The following procedure is a polynomial y = x ^ 6-10x ^ 5-26x ^ 4+344 x ^ 3+193 x ^ 2-1846x-1680 in the interval [-8,8] of the minimum error is not more than 0.001. This is a complex polynomial, can first draw function with matlab about curves, to confirm the function of the minimum are probably in [-8,8] range, and then find the exact solution of this program.)

学习线性分类器，可以自动识别两类数据点，数据点可以有交叉域，或者没有，共使用了三种方法。(Learning the self-learning process of linear classifier, and then design a linear two-class classifier and do some research based on the feature of linear classifier.)

安捷伦USB 示波器例程。有这东西的兄弟有福了(Agilent USB Oscilloscope routines. The brothers have this blessed thing)

克里金插值的matlab代码及其说明文档：强人学习克里金插值方法的matlab代码，其中含有使用文档，原理说明，以及代码注释！(The kriging interpolation matlab code and its description document: strongman learning kriging interpolation method matlab code, which contains the use of the document, Rationale, and code comments!)

电网电压稳定状态下的双馈风机磁通观测，可用于定子磁通的观测(Quasi steady-state magnitude of flux at generator stator)

轨迹跟踪---船舶航迹控制，典型的欠驱动控制问题。两种算法，采用了matlab---simulink，直观明了。(Sailing ship trajectory tracking control, a typical under-actuated control. Two algorithms using matlab--- simulink, intuitive and clear.)