多模型自适应切换的正确

说明：  设计一个有干扰的直接序列扩频通信系统， PN码由m序列产生器产生，经过高斯白噪声信道。在接收端接收到的信号包括“有用信号+高斯白噪声+干扰”，将接收信号进行解扩，判决，得到用户的信号检测结果，绘制不同的扩频增益（增益值为10，30，50）下，误比特率随信噪比Eb/N0的变化曲线。(Design of a direct sequence spread spectrum interference system, PN code generated by the m sequence generator, after white Gaussian noise channel. Receives the signal at the receiver, including &quot useful signal+ Gaussian white noise+ interference&quot , will receive the signal despreading, judgments, get the user' s signal test results, draw a different spreading gain (gain value of 10,30, 50), the BER curves with the signal to noise ratio Eb/N0.)

信号被窗函数截断，并做频谱分析，比较汉宁窗、三角窗等的特点(Window function signal is cut off, and do spectral analysis, comparing Hanning, triangular windows and other characteristics)

The spectrum sensing problem has gained new aspects with cognitive radio and opportunistic spectrum access concepts. It is one of the most challenging issues in cognitive radio systems. In this paper, a survey of spectrum sensing methodologies for cognitive radio is presented. Various aspects of spectrum sensing problem are studied from a cognitive radio perspective and multi-dimensional spectrum sensing concept is introduced. Challenges associated with spectrum sensing are given and enabling spectrum sensing methods are reviewed. The paper explains the cooperative sensing concept and its various forms. External sensing algorithms and other alternative sensing methods are discussed. Furthermore, statistical modeling of network traffic and utilization of these models for prediction of primary user behavior is studied. Finally, sensing features of some current wireless standards are given.

error correction code

粒子群K均值聚类算法matlab源代码供大家学习(Particle Swarm K-means clustering algorithm matlab source code)

高维降低维，最大程度的保存距离之间的差异(High dimension reduces dimension, the maximum degree of preservation distance difference)

有彩浮雕显示，运用matlab进行编程，简单明了，有说明注释~(Relief shown with color, using matlab to program, simple and clear, with explanatory notes ~)

两发两收的空间多路复用信道的matlab仿真程序。(Spatial multiplexing received two rounds of two-channel matlab simulation program.)

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可直接运行的matlab代码，Asift算法，比SIFT找到的特征点多很多。(Can be directly run matlab code, Asift algorithm, more than SIFT to find the feature points.)