doa_music

Audio processing using matlab

n多文章全部是IEEE上的关于多速率信号处理的内容，包括均匀和非均匀调制滤波器组的应用。其中cmfb.m为matlab文件，是A Kaiser Window Approach For The Design Of Prototype Filters Of Cosine Modulated Filterbanks的源代码，是老外给的M文件，很有参考价值。(n number of articles on all of the IEEE Signal Processing on the multi-rate content, including uniform and non-uniform application of modulated filter banks. Matlab file for cmfb.m which is A Kaiser Window Approach For The Design Of Prototype Filters Of Cosine Modulated Filterbanks the source code, is a foreigner to the M-file, a good reference.)

这是一个基于空时分组编码的MIMO_OFDM通信系统的仿真设计。此系统包括QPSK调制解调，IFFT调制，空时编解码，基于训练符号的信道估计等通信模块。 (This is a space-time block coding based on the MIMO_OFDM communication system simulation design. This system consists of QPSK modulation and demodulation, IFFT modulation, space-time coding and decoding, based on training symbols such as communication channel estimation module.)

根据输入的调制方式，对输入序列MOD_IN进行调制，分别采用BPSK, QPSK, !6QAM, 64QAM，完成对星座图的映射(According to the modulation input, the input sequence MOD_IN modulation, using BPSK. QPSK,! 6QAM, 64QAM, the completion of the mapping constellation)

空时编码的matalb仿真程序，包含stbc(Space-time coding matalb simulation program, contains STBC)

neural network back propagation

Plots a polar figure in dB

在莱斯信道下调制方式为M-QAM的基本通信系统误码率计算公式和仿真(At Rice channel M-QAM modulation scheme is the basic communication system BER formulas and simulation)

说明：  OFDM是将高速串行数据分成成百上千路并行数据,并分别对不同的载频进行调制,这种并行传输体制大大扩展了符号的脉冲宽度,提高了抗多径衰落的性能。同时,在传统的频分复用方法中,各子载波之间的频谱互不重叠,频谱利用率较低。而采用OFDM技术,一个OFDM符号之内包括多个经过调制的子载波的合成信号,每个子载波在频谱上相互重叠,这些频谱在整个符号周期内满足正交性,因而在接受端可以保证无失真恢复,从而大大提高频谱利用率。(OFDM divides high-speed serial data into hundreds of parallel data channels and modulates different carrier frequency separately. This parallel transmission system greatly expands the pulse width of symbols and improves the performance of anti-multipath fading. At the same time, in the traditional method of Frequency Division multiplexing, the spectrum between the sub-carriers does not overlap each other, the spectrum utilization ratio is low. In the case of OFDM, an OFDM symbol consists of multiple modulated sub-carriers, each of which overlaps in the spectrum, which is orthogonal throughout the symbol period, thus, no distortion recovery can be ensured at the receiving end, thus greatly improving the spectrum utilization ratio.)

拉普拉斯特征映射，采用热核构造权重，是一种基于流行学习的非线性降维技术，可用于图像分割提高聚类的性能(Laplacian Eigenmap is a kind of nonlinear dimensionality reduction technique which based on manifold study, it choose the weights W using the heat kernel and it can be used for image segmentation to promote clustering performance.)