18 无线传感器网络时间同步算法案例

linear and recursive least mean square

一个很完整的LDPC程序，计算速度比较快,可实现多种速率的LDPC编码(a nice LDPC programm )

在matlab中，基于GUI工具箱，实现了频谱分析仪的功能(GUI-based toolbox in matlab, the spectrum analyzer function)

pwm整流器的MATLAB仿真程序，都正确。(MATLAB PWM conventer)

研究表明超高斯分布更加贴近语音信号的实际分布，然而语音信号很难用单一的概率密度 函数准确描述，针对这一情况，提出了一种用超高斯混合模型对语音信号幅度谱建模的新方法，并推导了 基于此模型的幅度谱最小均方误差估的估计式。仿真结果表明：与传统的短时谱估计算法相比，该算法不 仅能够进一步提高增强语音的信噪比，而且可以有效减小增强语音的失真度，提高增强语音的主观感知 质量。 (Recent research indicates that the speech spectral amplitude distributions could be fairly described with super-Gaussian probability density function. However, the complexity of speech signal determines that the distribution statistics ofspeech signal could not be well described by single simple function. Thus a super-Gaussian mixture model for speech spectral amplitude is proposed, and with this model, a minimum mean-square error (MMSE) estimator for speech signals spectral amplitude is derived. The simulation results show that this algorithm based on Gaussian and super-Gaussian speech model could achieve better noise suppression and lower speech distortion as compared with the conventional short-time spectral amplitude estimation algorithm. )

Assume that a direct sequence spread spectrum system uses the Barker code of length 7 (N=7) as its spreading sequence. a. Randomly generate 8 symbols (d0~d7) from the set {+1,-1}. b. If each chip of the Barker code is denoted as cj, j=0~6, spread each symbol di by the Barker code. (Please refer to p. 17 of the slides.) Use “stem” to plot the signals before spreading and after spreading

An edge assisted sliding window decorrelator (EASWD) is proposed to enhance the performance of CDMA receiver. A one-shot decorrelator is used to estimate the edge bits for edge correction of windowed sequence of sliding window decorrelator.

美国大学的一片硕士学位论文，关于光纤色散补偿的，比较有价值。(American University Master' s degree thesis was on the optical fiber dispersion compensation, more valuable.)

matlab Applet Exercises

FFT变换(快速傅立叶变换) 用于学生实验参考例程(this folder includes FFT transform and some reference examples for students to experiment)