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Description: 提出用照相缩微法制作一个小孔距对称双圆孔作为待测透镜傅里叶变换输入函数,利
用其傅里叶变换频谱面上的干涉条纹间距的测量值计算透镜焦距。该法装置简单,调节方便,测
量精度较高。分析了测量原理和测量误差,并给出了与理论分析相符的结果。
-Proposed method microfilm camera, a small hole as a Distance symmetric double Fourier transform lens under test input function, using its Fourier transform spectrum of the interference fringe spacing of the surface of the lens focal length calculation of measured values. The law device is simple, convenient, high measurement accuracy. Analysis of the measurement principle and measurement error, and gives consistent with the theoretical analysis results.
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Size: 182272 |
Author: 陈建军 |
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Description: 利用MATLAB对扩频信号进行检测和参数估计，结果表明本方法具有在低信躁比下检测的优势-The use of MATLAB for spread spectrum signal detection and parameter estimation results show that this method is in the low than under the letter impatient edge detection
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Size: 2048 |
Author: 王将 |
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Description: 频谱感知是认知无线电的一个重要前提，而能量检测法则是比较成熟的频谱感知算法。它可以有效地凡发现频谱孔，使得认知无线电与周围通信环境相适应-Spectrum sensing cognitive radio is an important prerequisite, and the law of energy detection of the spectrum is a more mature perception algorithm. Where it can be found in the spectrum hole, making cognitive radio communication with the surrounding environment to adapt to
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Size: 3675136 |
Author: 张玉 |
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Description: 一些基本信号的FFT变换及matlab程序，包括方波，圆孔信号，以及一些信号的频谱和低通滤波程序-Some of the basic signal and the FFT transform matlab programs, including square, round hole signals, as well as some signal spectrum and low-pass filtering procedure
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Size: 1024 |
Author: lizze |
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Description: Cognitive radio code - detection a hole in spectrum
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Size: 1024 |
Author: Thomas |
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Description: These
cooperations are facilitated by dynamically and opportunistically assigning one of the secondary users as a relay to assist the other
one, which results in more efficient spectrum hole detection. Also, we investigate the impact of erroneous detection of spectrum holes
and thereof missing communication opportunities on the capacity of the secondary channel. The capacity of the secondary users with
interference-avoiding spectrum access is affected by 1) how effectively the availability of vacant spectrum is sensed by the secondary
transmitter-receiver pair, and 2) how correlated are the perceptions of the secondary ransmitter-receiver pair about network spectral
activity. We show that both factors are improved by using the proposed cooperative protocols.
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Size: 1133568 |
Author: hossein |
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Description: 利用通信系统中调制信号的循环平稳特性,对频谱空洞进行检测,提升频谱感知技术在低信噪比下的性能。实验结果表明:与传统能量检测方法相比,采用循环特征检测方法改善了认知无线电中频谱空洞的检测能力。-Based on the cyclostationarity of modulation signals, spectrum hole is detected, aiming at the improve- ment of the performance of spectrum sensing in low SNR situation. The results show that comparing with the tra- ditional energy detection technique, cyclostationarity-based spectrum sensing technique has greatly improved the detective ability in cognitive radio.
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Size: 200704 |
Author: 曹蒙 |
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Description: 本文首先介绍了认知无线电的基本概念,对认知无线电在WRAN系统、UWB系统及WLAN系统等领域的应用分别进行了讨论。在此基础上,针对实现认知无线电的关键技术从理论上进行了探索,分析了影响认知网络正常工作的相关因素及认知网络对授权用户正常工作所形成的干扰。从理论上推导了在实现认知无线电系统所必须面对的弱信号低噪声比恶劣环境下,信号检测的相关方法和技术,并进行了数字滤波器的算法分析,指出了窗函数的选择原则。-The development of the wireless business results in increasing needs of the frequency. Wireless communication is facing a challenge. Radio resource is distributed by the government, which generally rises inequality and waste of Radio resource.
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Size: 573440 |
Author: 曹蒙 |
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Description: 针对基于距离谱的凿孔卷积码优化设计问题, 提出了一种高效的凿孔卷积码距离谱计算方法. 利
用卷积码状态图和凿孔码凿孔图样构造一个长度为凿孔周期的状态转移矩阵序列, 并利用状态转移矩
阵序列的乘积计算传输函数和距离谱. 为了避免符号矩阵的求逆运算, 又给出了基于状态逐步消除的传
输函数计算方法. 分析和仿真结果表明: 这种方法既有较高的计算效率, 又有很强的实用性, 可以用来
进行优化设计或者理论分析.-Hole to the distance spectrum of convolutional codes calculation
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Size: 315392 |
Author: pengdong |
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Description: cognitive radio hole spectrum detection using fixed threshold and reading from excel file
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Size: 27648 |
Author: Clarence |
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Description: 循环平稳特征频谱空穴检测，能很好的使用和检测。也有理论-The Cyclostationary the spectrum hole detection, the use and detection. Theory
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Size: 162816 |
Author: xiaonian |
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Description: Spectrum holes” represent the potential opportunities for non-interfering (safe) use of spectrum and can be considered as
multidimensional regions within frequency, time, and space. The core challenge for secondary radio systems is to be able to
robustly sense when they are within such a spectrum hole
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Size: 687104 |
Author: kgmark |
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Description: Sequence Design for Cognitive CDMA Communications under Arbitrary Spectrum Hole Constraint
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Size: 713728 |
Author: wang |
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Description: spectrum hole detection techniques
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Size: 360448 |
Author: suganthi |
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Description: 这是一个Matlab实现的能量检测程序，通过能量预测减少整体的错误率，从而实现对协作频谱感知的优化。它在认知无线电网络的自适应环境中表现很好，可以更好地填补频谱空洞。(This is a Matlab implementation of energy detection procedures, through the energy prediction to reduce the overall error rate, in order to achieve the optimization of cooperative spectrum sensing. It performs well in the adaptive environment of cognitive radio networks and can better fill the spectrum hole.)
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Size: 1024 |
Author: geng1992
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