查询词典 radio-frequency spectrum

The general closed formula of power spectrum density for multi-user aggregate pulsed UWB radio is given, which is the theoretical base for optimizing PSD design of UWB radio. We investigate the main system parameters impact to the PSD of UWB aggregate signals.

从理论上给出了基于超宽带冲激无线电方式的常规调制信号的功率谱密度函数的一般性表达式，为超宽带信号的功率谱优化设计提供了理论基础，研究了系统参数对超宽带信号功率谱的影响。

Key words: communication technology; cognitive radio; spectrum sensing; cooperative spectrum sensing; continuous spectrum sensing

关键 词：通信技术；认知无线电；频谱感知；协同频谱感知；连续频谱感知

The lower limit of what frequencies constitute "radio" is not precisely defined, but 5 kHz is a widely accepted starting point for the radio spectrum.

低限什么频率构成"收音机"精确地不被定义，仅5 千赫是一个广泛被接受的起点为无线电光谱。

Receiving, the radio waves from celestial observation equipment, which can be used to determine the strength of celestial radio, radio source location, size, the polarization of the radio emission and spectrum, etc..

接收、观测来自天体的射电波的设备，它可用来测定天体射电的强度，射电源的位置、大小，射电辐射的偏振和频谱等等。

Important precursor to the advent of cognitive radio that promises better use of radio spectrum.

重要前兆的到来认知无线电的承诺，更好地利用无线电频谱。

Radio operates, as you might expect, in the public portion of the radio spectrum .

正如想象的那样，无线电工作在无线电频谱的公共部分。

Radio spectrum measurement is an important application in the radio spectrum management field.

0引言无线频谱监测与管理是伴随着无线通信技术的进步而不断发展的。

The spectrum detection is one of the important steps in Cognitive Radio, and the cooperative spectrum detection is popular because of its good detection ability.

频谱检测技术是认知无线电中极其重要的环节，而协作式的频谱检测由于其良好的检测性能日益受到人们的关注。

Cognitive radio technology can improve the spectrum utilization greatly by sharing spectrum allocated to primary users opportunistically.

通过机会式地共享已分配的授权频谱，认知无线电技术可以极大地提高频谱的利用率，解决目前频谱资源日益遗乏的难题。

In overlay cognitive radio, secondary users harness unused spectrum bands for their transmission; in underlay cognitive radio, an ultra-wideband transmission with very low power spectrum density is employed by the secondary user to minimize harmful interference to the primary users.

认知无线电和动态频谱接入网络因此应运而生，成为近期无线通信和网络研究的热点。通常的认知无线电技术主要采用两种频谱接入方式：Overlay和Underlay。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。