Line-search-technique

压缩包里有OFDM信号的分析，频谱，星座图，加窗(Compression bag with OFDM signal analysis, spectrum, constellation, plus window)

10mQPSK C++代码 rrc滤波(10mQPSK C++ rrc)

显示采样率的GUI源码，包括理想采样，零阶保持采样，和其他一些方式。对于学习和理解采样定理很有帮助(Show the sampling rate of the GUI source code, including the ideal sampling, zero-order to keep sampling, and some other way. For learning and understanding of the sampling theorem helpful)

考虑L的三个不同值：L＝256（3个数据段），L＝128(7个数据段)和L=64（15个数据段）。各自的谱估计图如上图所示。可以明显的看到，加窗明显的减小了频谱上的假谱峰，但也更加进一步平滑了谱峰。所以，对于L＝64的情况，在ω＝0.8π的谱线可以很确定的辨认，但是那两个靠近的谱峰不容易区分。对于L＝128的情况，这种情况提供了在分离和检测间最好的均衡。当然，对于在L＝256时的情况，效果是更好的，能够从谱估计图上明显的分辨出三条谱线的存在以及它们幅度关系的强弱。 除了Welch法外，还可以采用对多个周期图求平均的功率谱估计方法的其他方法如Bartlett法等等，在功率谱估计上也能取得较好的结果。(consider three different values : L = 256 (3 data), L = 128 (7 data) and L = 64 (15 data). Their spectral estimation map as shown in Fig. It is clear to see that increase significantly decreasing window of the spectrum of false peaks, but much more to further smooth the peaks. Therefore, L = 64, in the case = 0.8 spectrum can determine the identification, but that the two peaks around is not easy to distinguish. L = 128 for the situation, which provided the separation and detection among the best balanced. Of course, L = 256 in the case, the effect is better, from the spectral estimation map clearly distinguish between the three lines of the existence and their relationship to the rate of strength. In addition to Welch law, but also can be used to map multiple cycle for the average power)

这是AMI码的波形编辑和其付氏变换，以及功率普密度分析(This is the AMI code waveform editor and its Fourier transform, and the power density analysis Cape)

说明：  matlab 与VC混合编程，通过MATLAB调用MATLAB的函数的WORD文档，按上面的例子，一步一步，就可以实现。(mixed programming with VC matlab, MATLAB by calling the function MATLAB WORD document, according to the example above, step by step, can be achieved.)

普林斯顿开发的快速球面调和变换算法，我把它移植到windows下，并做成链接库，可以直接调用(Princeton rapid development of the spherical harmonic transform algorithm, I transpose it to the windows, and causing link library, and can directly call)

信噪比，计算公式是信号能量比上噪声能量，有助于分析信号成分的(Signal-to-noise ratio, and the calculation is signal energy on energy than noise, help analysis of signal components )

模仿程序matlab代码，WCDMA系统(模仿程序programming matlap)

说明：  matlab，FM,通信系统，调制，解调，信号波形，频谱(matlab, FM, a communication system, a modulation, a demodulation, the signal waveform, the spectrum)