Many of the TV frequency bands have been vacated by TV's move to digital, so, in a country hungry for wireless resources, it was proposed that this spectrum get redirected to mobile access use.
当电视信号变为数字信号后，许多电视的频率带宽都被闲置下来。因此，在一个渴望无线资源的国家，这些频带被引向移动接入应用可谓众望所归。
We currently have two extremes for spectrum allocated for Internet access: cellular and unregulated (WiFi and friends).
目前我们有两种截然相反的供互联网接入的频谱分配方式：蜂窝网络和未管制的（WiFi及其邻接频谱区间）。
They can all be built to have equal access to a phone's capabilities providing users with a broad spectrum of applications and services.
它们可以平等的享有手机性能，向用户提供广泛的应用和服务。
As frequency divided multiplex access is widely adopted in communication satellite system, strict frequency spectrum limits on modulator is mandated.
通信卫星的频分复用机制，对卫星通信系统的发送信号频谱成型提出了严格的要求。
This paper introduces the principle of spread spectrum communication, stresses the application of spread spectrum technique, and summarily introduces the broadband access technology of power line .
本文介绍了扩频通信的基本原理，重点论述扩频通信技术在家庭测控网络中的应用，同时介绍了电力线宽带接入技术。
In order to improve the spectrum usage of the up-band of fixed satellite service(FSS), an unlicensed access scheme is presented.
为了提高卫星固定业务上行频段的频谱利用效率，提出了一种无授权接入该频段的方案。
A new approach called dynamic spectrum access (DSA) promises to alleviate the problem of spectrum shortage.
新兴的动态频谱接入(DSA)技术可以解决频谱稀缺问题。
In this paper, dynamic spectrum access and opportunistic spectrum access have been studied, which are the two methods of spectrum usage in the authorized spectrum band.
研究了授权频段的两种频谱利用方法：动态频谱接入和基于动态频谱接入模型之一的机会频谱接入。
In a word, TDCS is a spectrum agile and broadband Code Division Multiple Access (CDMA) technology.
总而言之，TDCS是一种具有频谱自适应能力的宽带码分多址系统。
A joint blind estimation method based on spectrum overlap for uplink interleaved orthogonal frequency division multiple access carrier frequency offset and timing synchronization is proposed.
提出了一种基于功率谱叠加的交织正交频分多址系统上行链路载波频偏和定时同步联合估计算法。
Using the licensed spectrum in "secondary utilization" way, cognitive radio provides a feasible solution for contradiction between spectrum resource scarcity and increasing radio access demands.
认知无线电通过对授权频谱进行“二次利用”的方式，为缓解频谱资源缺乏与日益增长的无线接入需求之间的矛盾提供了可行的思路。
Simulation results show that this algorithm can lower the capacity loss of authorized user efficiently and improve spare spectrum efficiency, moreover, it can make access decision more efficiently.
仿真结果表明：该算法有效降低了授权用户的容量损失，提高了空闲频谱的利用效率，能够更有效地做出接入决策。
The application of double access mutual spectrum analysis and mutual coherent analysis is to verify the accuracy of the examined result from different aspects and different excitation modes.
双通道相干分析（相干谱）的应用在于对不同角度和不同激振方法对所测结果准确性进行判断。
Simulations result show that this algorithm can lower capacity loss of authorized user efficiently and improve spare spectrum efficiency, make access decision more efficiently.
仿真结果表明：该算法有效地降低了授权用户的容量损失，提高了空闲频谱的利用效率，能够更有效地做出接入决策。
Cognitive radio can effectively improve the utilization of spectrum through dynamic spectrum access technology, in which the channel selection affects directly the performance of the system.
认知无线电可以通过动态频谱接入技术来有效的提高频谱的利用率，而在动态频谱接入中信道选择策略的优劣直接影响着系统的性能。
In our scheme, unlicensed users are allowed to adaptively select available spectrum, adopt dynamic spectrum access technology, improving spectrum utilization effectively.
该方案允许未授权用户自适应地选取可用带宽，实现了动态频谱接入，有效地提高了频谱利用率。
All of those are important for choice signature sequences in the spectrum code-division multiple-access communication systems.
所有这些参量对于在扩展频谱码分多址通信系统中，指导特征序列的选取有着极为重要的意义。
The effect of bandwidth division on the improvement of the frequency spectrum utilization is analyzed under the condition of the multi-access interference and Gaussian white noise.
分析了在信道存在加性白噪声和多址干扰的条件下，频带细化对提高频谱利用率的作用。
With the increased need for communications come a need for the efficient use of tile frequency spectrum and the more multiple access technique.
随着人们对通信需求的不断增长，带来了如何有效地利用频率问题，同时也产生了越来越多的多址技术。
The thesis mainly focuses on spectrum sensing and dynamic spectrum access of cognitive radio system.
频谱感知能力是认知无线电通信的一个重要前提，也是其核心功能之一。
It is emphasized how to select the spread spectrum access code, and how to realize synchronization and modulation etc.
着重介绍了扩频地址码的选择及实现、同步方式和解调方法等。
A distributed multiple access protocol, which is based on spread spectrum code switching technique, for the integrated voice and data in packet radio networks is proposed.
本文提出了一种以扩频多址为基础的在信包无线网中实现话音和数据综合服务的分布式多址协议。
For cognitive MIMO system based on the queuing stability model, the power control optimization problem and the system performance of spectrum access is analyzed.
研究了基于队列稳定性模型的认知多天线系统功率控制优化问题，并对系统性能进行了分析。
For cognitive MIMO system based on the queuing stability model, the power control optimization problem and the system performance of spectrum access is analyzed.
研究了基于队列稳定性模型的认知多天线系统功率控制优化问题，并对系统性能进行了分析。
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