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为了提高通信系统的信息传输速率，人们提出了UWB通信系统，即Ultra-Wideband 通信系统。在UWB系统中，信号的带宽一般都在GHz的量级，这么宽的带宽造成了UWB系统和现有的通信系统频谱的重叠。为了降低对现有通信系统的影响，UWB信号的设计需要满足一定的频谱模板。如果一个信号的频谱基本满足频谱模板的规定（即在绝大部分频段内功率小于规定区间的上限），我们可以认定其为一个UWB信号。-In order to improve communication systems, informatio
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TIME HOPPING SPREAD SPECTRUM SIGNALS
(ULTRA WIDE BAND SIGNALS)
- UWB SIGNAL DEscr iptION
- THE UWB TRANSMITTER
- THE UWB RECEIVER
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频谱感知技术是认知无线电技术里最关键和最具挑战性的技术-Spectrum sensing is a key technology in Cognitive
Radio (CR). It provides the CR system with available vacant
channels list by sensing the spectrum environment over a wide
frequency band. However, local sensing by
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cdma matlab code. this also contains direct sequence spread spectrum where narrow band signal can be converted to wide band signal
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A literature survey on Ultra wide band spectrum and the antennas used
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This code performs wide band Cooperative Spectrum Sensing under various noise levels. A large number of primary users as well as secondary users are considered.The detection is power spectral density based . This project gives the lower bound for the
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共振解调法诊断轴承损伤类故障的原理概述如下:当轴承某一元件表面出现局部损伤时，在受载运行过程中要撞击与之相互作用的其它元件表面，产生冲击脉冲力，由于冲击脉冲力的频带很宽，必然包含轴承外圈、传感器甚至附加的谐振器等的固有频率而激起这个测振系统的高频固有振动。根据实际情况可以选择某一高频固有振动作为研究对象，通过中心频率等于该固有频率的带通滤波器把该固有振动分离出来。然后进行包络解调，去除高频衰减振动的频率成分，得到只包含故障特征信息的低频包络信号，对这一包络信号进行频谱分析便可以容易地诊断出轴承的
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基于matlab的直接序列扩频通信系统仿真。这种技术是将要发送的信息用伪随机码（PN码）扩展到一个很宽的频带上去，在接收端，用与发端扩展用的相同的伪随机码对接收到的扩频信号进行相关处理，恢复出发送的信息。-matlab direct sequence spread spectrum communication system based on. This technology is an extension of information to be transmitted with a pseud
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Wideband Spectrum analyze With Labview and USRP
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Electromagnetic compatibility
and Radio spectrum Matters (ERM);
Wideband transmission systems;
Data transmission equipment operating
in the 2,4 GHz ISM band and
using wide band modulation techniques;
Harmonized EN covering the essential require
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认知无线电，宽频带频谱感知算法仿真。包括频谱感知算法，信号建模，仿真图(cognitive radio. wide frequency band spectrum sensing, including algorithm, modeling, figures)
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