Digital-communication-theory

filter.. desing of filter..

This function calculates displacement response at interfaces of an elastic multilayered medium to a vertically propagating unitary SV or SH elastic wave. The function can be used to calculate the displacement response in a layered soil profile. Transfer functions between interfaces can be easily calculated by division of the total (=upward+downward) displacement response on the corresponding interfaces.

模拟退火算法源码及相关论文，代码有详细注释，配以论文解释(Simulated annealing algorithm source code and related paper , the code has detailed notes , together with the paper explains)

利用matlab软件设计并仿真下面的无线通信系统。模拟信源为单音频信号。模拟调制方式为DSB。信道为多径信道（仿真中2径），信道中噪声为加性高斯白噪声。采用相干解调接收。画出了解调器输出端性能曲线与点信噪比SNR的关系。 (Software design and simulation using matlab the following wireless communication systems. A single analog audio signal source. Analog modulation of DSB. Channel multi-path channel (simulation 2 diameter), channel noise is additive white Gaussian noise. The use of coherent demodulation receiver. Draw the output of the demodulation performance curve and the point of the relationship between signal to noise ratio SNR.)

rake接收机，简单易懂，来自美国著名教授，如有问题，联系02212090@bjtu.edu.cn()

说明：  语音信号试验语谱图、高通、低通，可以将时域分析中的方法应用于we_be10k语音段，还可以用auread、wavread等命令读入语音段进行处理。(we_be10k auread、wavread )

频域SCOT自适应时延估计，实质上是对广义功率频函数平方得到的数的相位谱做最小二乘拟合，求得时延估计。(Frequency domain SCOT adaptive time delay estimation, is essentially the generalized power-frequency phase of the function of the square of the number spectrum of the least squares fitting obtained delay estimates.)

仿真采用QPSK和16-QAM调制时，接收机采用理想信道估计和利用训练符号进行信道估计的误比特率性能(The simulation using QPSK and 16-QAM modulation, receiver with perfect channel estimation and using training symbols for the bit error rate performance of the channel estimation)

三重BOOST升压电路仿真，电压电流纹波小，效果较好(Three BOOST boost circuit simulation, voltage and current ripple is small, the effect is better.)

说明：  BCH 编解码的MATLAB 实现。BCH码是一类重要而有效的纠正多个随机错误的循环码，由于该码具有严格的代数结构，所以是到目前为止研究得最为详尽、应用最为广泛的一类码，已有多种译码算法。(BCH codec of MATLAB. BCH is a kind of important and effective redress the wrong number of random cyclic code, as the code strictly algebraic structure, it is so far the most detailed study in, the most widely used type of a code has a variety of decoding algorithm.)