pn-synchronism-simulation

Differential Evolution

alidity Measures for the Fuzzy Cluster

说明：  傅里叶变换我们都知道，那怎么来实现快速傅里叶变换呢？(Fourier transform we all know, how to achieve the fast Fourier transform it?)

数学建模清华数模讲义\model9b (Mathematical modeling Qinghua digital-analog handouts model9b)

说明：  介绍了一种荃于MATLAB数字信号处理工具箱、MATLAB数据分析和MATLAB圈形对 象的时变数字信号瞬时频率枯计方法。这种方法利用时频分析结果来估计信号的麟时频率，其 中涉及时频分析、滤波、曲线拟合辞多种处理过程。处理过程的编程实现封较于用户界面上作 为文互工具的控件中，由用户通过交互界面逐步完成估计瞬时预率的工作.(Tsuen introduced a digital signal processing in the MATLAB toolbox, MATLAB and MATLAB data analysis of ring-shaped object digital signal time-varying instantaneous frequency of dry method. This method using the results of time-frequency analysis to estimate the signal frequency CHU, which involves time-frequency analysis, filtering, curve fitting a variety of speech processing. Programming process to achieve closure on the user interface than the text of each other as a control tool, by the user interface step by step through the completion of pre-estimated instantaneous rate of work.)

用matlab仿真了LDPC码的编码译码程序，及其用BPSK调制传输。并测其误码率(Matlab simulation of the LDPC codes with coding and decoding process, and its transmission with BPSK modulation. And measure its error rate)

8 Point FFT using Matlab Simulink

灰色预测的模型，我们用它做过东北三省的数学建模比赛并取得不错的成绩。(The grey prediction model, we use it for the mathematical modeling contest in the three provinces of Northeast China and achieved good results.)

正交频分复用(OFDM)技术是一种可以有效对抗符号间干扰(ISI)的高速数据传输技术。OFDM是一种特殊的多载波调制方式，它的基本思想是将高速传输的数据流通过串/并转换，变成在若干个正交的窄带子信道上并行传输的低速数据流。OFDM接收机有三个关键技术：信道估计技术，降低峰均比(PAPR)技术和同步技术。OFDM技术能有效的对抗多径衰落等，有着诸多的优点，但是OFDM有一个发展瓶颈，即OFDM信号的峰均功率比很大，很容易导致OFDM信号的交调失真和系统性能的下降。因而如何降低OFDM信号的峰均功率比一直是OFDM技术的一个研究热点问题。论文针对上述问题，重点研究了降低OFDM信号的峰均功率比的SLM与PTS算法，并利用Matlab对算法进行了仿真研究，并对仿真结果进行了分析。(Orthogonal frequency division multiplexing (OFDM) is a high-speed data transmission technology that can effectively combat inter-symbol interference (ISI). OFDM is a special multi-carrier modulation method, its basic idea is to high-speed transmission of data stream through the serial/parallel conversion, in a number of orthogonal narrowband sub-channel parallel transmission of low-speed data stream. OFDM receivers have three key technologies: channel estimation techniques, reduced peak-to-average ratio (PAPR) techniques and synchronization techniques. OFDM technology can effectively combat multipath fading, etc., there are many advantages, but OFDM has a bottleneck in development, that is, OFDM signal peak power ratio is large, it is easy to lead to OFDM signal intermodulation distortion and system performance degradation. Therefore, how to reduce the peak-to-average power ratio of OFDM signal has been a hot topic in OFDM technology. In this paper, the SLM and PTS algorithms for reduc)

La señ al x(t) = 2 cos(11.200πt) + 2cos (10.000 πt) cos (1.000 πt) se suma a una señ al de ruido blanco (coloreado) gausiano de banda limitada con media igual a cero y con una densidad espectral de potencia de 1 µ w/Hz hasta una frecuencia de 15.000 Hz y cero a frecuencias mayores.