question4

DFT：离散傅立叶变换 符运行后得频谱图(DFT: Discrete Fourier Transform running at a frequency spectrum)

本文档，介绍了基于Matlab中simulink几种信号的调制解调的仿真。比较实用(This document describes the simulation in Matlab simulink several signal modulation and demodulation. More practical)

MATLAB教材学习资料希望大家好好使用，多提宝贵意见(studying for matlab)

alpha稳定分布的函数。该分布是一种连续概率分布，其概率密度比高斯分布概率密度有更厚的拖尾，是一类适用范围很宽的随机信号模型，比高斯分布有更广泛的适用性。(Alpha stable distribution function. This distribution is a continuous probability distribution, the probability density are thicker than gaussian probability density trailing, random signal model is a kind of very wide application scope, has wider applicability than gaussian distribution. )

蓝牙定位的DEMO,安卓要求4.4,如果没有4.4就不行哦(Bluetooth positioning DEMO, Andrews requires 4.4, 4.4 will not work if not oh)

z-source inverter simulink model

介绍了matlab坐标轴标注方法和设置特殊字体的方法(Matlab axis label describes the methods and ways to set a special font)

利用bior5.5小波对声音进行能量特征提取。小波基可以任意变换。(The sound use bior5.5 wavelet energy feature extraction. Wavelets can transform any.)

Matlab source code of garborfilter

WIMAX_WZ_withencoding:信道估计，相位噪声补偿，频偏估计，编解码都有 WIMAX_WZ_withoutencoding：在上面的工程基础上，去掉编解码部分 WIMAX_WZ_withoutprocessing：在上面的工程基础上，再去掉相位噪声补偿，频偏估计 WIMAX_WZ_withoutprocessing2：在上面的工程基础上，改用新的前导和导频联合信道估计方案,参考文档《基于802_16d标准的OFDM信道估计技术的研究与实现.kdh》 因为白噪声信道仿真只能体现QPSK调制和RS-CC编码的性能，需要仿真SNR可控的SUI信道，来估计信道均衡的性能。 在多普勒频偏fd>100Hz时，联合信道估计性能才比前导估计强，否则前导估计性能更优。对于600MHz中心频率，要求收发机相对运动速度大于180km/h，这种情况出现的概率不大(WIMAX_WZ_withencoding: channel estimation, phase noise compensation, frequency estimation, the codec has WIMAX_WZ_withoutencoding: the project on the basis of the above, remove the codec section WIMAX_WZ_withoutprocessing: the project on the basis of the above, then remove the phase noise compensation, offset estimation WIMAX_WZ_withoutprocessing2: In the project on the basis of the above, use the new leader and pilot joint channel estimation scheme, the document " Standards-based 802_16d OFDM channel estimation and implementation of technology .kdh" because white noise channel simulation only reflects the QPSK modulation and RS-CC coding performance requires simulation SNR controllable SUI channel, to estimate the performance of channel equalization. When Doppler shift fd> 100Hz, joint channel estimation performance was stronger than the leading estimate, otherwise better estimation performance leader. For 600MHz center frequency transceiver requirements relative velocity )