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应用基于LabVIEW的虚拟仪器的构建方法，搭建和开发了音频信号频
谱测试系统，并与传统音频频谱仪所测得的频谱进行比较。系统的研发成功，能
极大地提高了频谱测试的效率，保证了测试系统的准确性、稳定性及安全性，且
具有成本低廉和开发周期较短的特点，对设计和研发类似测试系统具有一定的推
广价值。同时，本文给出了系统软硬件的设计方案，做出了可行的解决方案。-Application based on LabVIEW virtual instrument approach to build
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认知无线电是一种通过与其运行环境交互而改变其发射参数提高频谱利用率的新的智能技术。-Cognitive radio is viewed as a novel approach that can change its transmitter parameters based
on interaction with the environment where it operates and can alSO improve its spectrum access and efficiency．
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Abstract：Spectrum Sensing is one of the key
technologies in cognitive radio．This article summarize$
the latest development in the field．ana—
lyzes the performance of detection algorithm for
physical layer and its detection policies，examining
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一种关于GMSK调制技术研究，为了进一步提高频谱的利用效率，设计了一种改进的GMSK-A kind of GMSK modulation technique, in order to further improve the spectrum efficiency, design an improved GMSK
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his article presents the characteristics of the signal used for the Galileo system with respect to those of the GPS system, as well as the adapted receiver architectures. An analysis of the sources of unintentional interference in the GPS ans GALILEO
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A board was built with an LM2577 to verify the
output ripple, the efficiency and the EMI spectrum
of radiation. The converter with some output
capacitors can respect the FCC standards, but not
the SAE J1113.
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Wireless Ad Hoc Networks comprise a fast developing research area with a vast spectrum of
applications. Wireless sensor network systems enable the reliable monitoring of a variety of environments
for both civil and military applications. The Ener
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Spectral Efficiency Analysis in OFDM and
OFDM/OQAM based Cognitive Radio Networks
The future wireless communication is expected to
be able to improve the efficiency of spectrum usage. To solve the challenge of spectrum shortage, an innovativ
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The DVB-T standard is the most successful digital terrestrial television standards in
the world. First published in 1995, it has been adopted by more than half of all
countries in the world. Since the publication of the DVB-T standard, however,
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Multi-Carrier Modulation is a technique for data-transmission where a high-bit rate data stream is divided into several parallel low bit-rate data streams and using these low bit-rate data streams to modulate several carriers. Multi-Carrier Transmiss
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The evolution of future wireless communication systems imposes a strong requirement on the efficiency of spectrum usage, which is expected to be leveraged by interacting and cooperating cognitive radio systems (CRS). It is very difficult to find unus
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The evolution of future wireless communication
systems imposes a strong requirement on the efficiency of
spectrum usage, which is expected to be leveraged by interacting
and cooperating cognitive radio systems (CRS). It is very difficult
to f
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基于最大重叠离散小波谱的定义, 本文提出了一种确定分形信号局部奇异性指数的算法, 构造了一种
类似于奇异性谱的直方图, 并用之来描述信号奇异性的全局统计分布. 算法的有效性通过数字试验及在真实心率数据
中的应用得到了验证.-Based on the definition of wavelet spectrum of the maximal overlap discrete wavelet transform, we propose a novel
algorithm for dete
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Cluster-based Transform Domain Communication Systems for High Spectrum Efficiency
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To fully exploit wireless radio resource and, thus,
increase spectrum efficiency, cognitive radios shall sense wire-
less environments and identify interference to allow opportunis-
tic transmissions for secondary systems. Based on Chen et al.
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Cognitive
radio is an intelligent technique used in wireless networks to take advantage of unused or underutilized spectrum. This
may be performed by allocating secondary users in the spectrum holes in order to enhance the efficiency of radio
r
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The spectrum sensing is the key enabling
technology in cognitive radio networks. It is able to fill voids in the wireless spectrum and can dramatically increase spectral
efficiency.
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在现代无线通信技术中，扩频通信是一种具有较强抗干扰性能的技术，正交频分复用(OFDM)是一种具有较高数据传输速率和频谱利用率，并能有效对抗频率选择性衰落的多载波调制技术，因而将这二者结合起来构建系统势必会进一步提高系统的抗干扰和抗衰落性能，研究其结合技术也逐渐成为无线通信领域的热点。随着3G的兴起，即将推出的LTE也将采用OFDM技术（正交频分多路复用）。
由于OFDM的多载波特性，使得直接序列扩频技术和跳频技术能够与OFDM技术进行有效的结合。在本文中,我们研究了OFDM）以及相关抗干扰抗
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扩频通信在现代无线通信技术中是一种具有较强抗干扰性能的技术，正交频分复用(OFDM)一种具有较高数据传输速率和频谱利用率，并能有效对抗频率选择性衰落的多载波调制技术，因而将这二者结合起来构建系统势必会进一步提高系统的抗干扰和抗衰落性能，研究其结合技术也逐渐成为无线通信领域的热点。随着3G的兴起，即将推出的LTE也将采用OFDM技术（正交频分多路复用）。
由于OFDM的多载波特性，使得直接序列扩频技术和跳频技术能够与OFDM技术进行有效的结合。在本文中,我们研究了OFDM）以及相关抗干扰抗衰落
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