x
uploads/radio spectrum.jpg

radio spectrum 【無線電】射頻頻譜。

radio stat

It was increasingly put to work on tasks ranging from how to auction a radio spectrum to devising a better way of paying defence contractors than cost - plus contracts ( which create incentives for the contractor to be inefficient ) or fixed - price contracts ( which may result in overpaying ) 機制設計被越來越多地用于各種場合,包括設計無線電頻段拍賣機制、以及為防務合同設計更加合理的支付機制以克服成本加成合同(會產生消極怠工的激勵)或固定價格合同(會導致給價過高)的弊端。

Future wireless communication systems trend to provide multi - services to mobile users . cdma technique is adopted by the 3rd generation mobile communication systems due to its flexibility in supporting multi - services . how to keep qos of heterogeneous services and utilize the scarce radio spectrum resources is challenging for 3rd generation mobile communication systems in this thesis we developed a radio resource allocation framework for wireless code division access ( cdma ) networks that support multi - class traffic with different data rates and bit error rate requirements . we proposed a new resource allocation scheme using joint adaptive power control and mmse multiuser receiver in multipath fading system 為移動用戶提供多種業務服務是未來無線通信網絡的主要發展方向。由于cdma技術具有靈活支持多種業務的優點,因而被第三代移動通信系統所采納。如何在惡劣的無線傳播環境里以及用戶運動且相互干擾的情況下為為各類業務提供qos保證,同時充分利用珍貴的無線頻譜資源,是基于cdma技術的第三代蜂窩通信系統必須致力解決的問題。

This paper introduce the status and fuction of radio monitor in the radio spectrum management at first , and explain radio monitoring center build every specification requirement put forward to national radio monitoring system , at the sam time , the paper analyses the radio interferece , examineto error , the comprehensive pain of design of monitoring system of handling , combining the actual proposition hi our province 本文首先對無線電監測在無線電頻譜管理中的地位作用和職能作了介紹,闡述了國家無線電監測中心對全國無線電監測系統建設提出來的各項技術要求,并從理論上就在無線電系統建設中需解決的無線電干擾,測向誤差,電磁兼容等問題作了分析。然后結合我省無線電管理工作的實際提出了搬移式綜合監測系統的設計方案。

Future mobile communications have to support the transmission of high rate data and multimedia applications in the radio spectrum , which is already extremely scarce . the basic idea of adaptive coded modulation is to maintain a constant throughput by varying the transmitted power level , symbol transmission rate , constellation size , coding rate or any combination of these parameters . thus , without sacrificing bit - error rate ( ber ) , these schemes provide high average spectral efficiency by transmitting at high speeds under favorable channel conditions , and reducing throughput as the channel degrades 自適應編碼調制( adaptivecodedmodulation , acm )的基本思想是在不犧牲系統傳輸性能(比如ber )為代價的前提下,通過單獨改變發送功率、波特率、編碼方案、碼率、調制方式,或者是綜合改變前面所述的各種參數,在有利的信道條件下,獲得較大的吞吐量,當信道質量下將時,相應地降低傳輸速率,最終達到提高平均頻譜效率的目的。

A monthly cell - phone service bill , for instance , contains charges for leasing radio spectrum , renting cell towers and purchasing the handset , as well as the amortization of the hardware at the cell base site , the cost of interconnections among cell sites , billing expenses and network operator profit 舉例來說,行動電話的月租費通常包含使用無線電頻譜、租用基地臺和購買手機,以及攤提行動電話基地臺硬體、基地臺之間的連接費用、計費成本和網路系統業者的利潤等。

Electromagnetic compatibility and radio spectrum matters - meteorological aids met aids - radiosondes to be used in the 400 , 15 mhz to 406 mhz frequency range with power levels ranging up to 200 mw - part 2 : harmonized en covering essential requirements under article 3 . 2 of the r tte directive v1 . 1 . 1 電磁兼容性和無線電頻譜情況.氣象輔助裝置.用于功率電平200 mw及以下的400 . 15 mhz到406 mhz頻帶的無線電高空測候器.第2部分:包括r tte指令3 . 2條款基本要求的協調的en

Electromagnetic compatibility and radio spectrum matters - electromagnetic compatibility standard for radio equipment and services - part 12 : specific conditions for very small aperture terminal , satellite interactive earth stations operated in the frequency ranges between 4 ghz and 30 ghz in the fixed satellite service v1 . 2 . 1 電磁兼容性和無線電頻譜情況.無線電設備和服務的電磁兼容性標準.第12部分:固定衛星服務中工作在4 ghz到30 ghz頻帶的衛星地面站微小孔徑端的具體條件

Is responsible for regulating the telecommunications industry in hong kong . its responsibilities include economic regulation , technical regulation , enforcing fair competition rules , setting technical standards , co - ordinating the development of the telecommunications infrastructure , investigating consumers and industry complaints , managing the radio spectrum , providing advice to the government on telecommunications matters and representing hong kong in international telecommunications organisations 負責監管香港的電訊業,其范圍包括經濟規管,技術規管,執行公平競爭條款,制訂技術標準,協調電訊基礎建設的發展,調查消費者和業界的投訴,管理無線電頻譜,就電訊事宜向政府提供意見,以及代表香港參與國際電訊組織。

Cdma2000 bs en electromagnetic compatibility and radio spectrum matters - base stations , repeaters and user equipment for imt - 2000 third - generation cellular networks - part 5 : harmonized en for imt - 2000 , cdma multi - carrier cdma2000 bs and repeaters covering essential requirements of article 3 . 2 of the r tte directive v2 . 2 . 1 電磁兼容性和無線電頻譜情況. imt - 2000第三代細胞網絡用基站中繼器和用戶設備.第5部分:包括r tte指令3 . 2條款的基本要求的imt - 2000的cdma多載波

For the purpose of determining the fine structures and deleting interferences in solar radio spectra , we introduce a data processing method with the combination of wavelet transform and channel - modification . firstly , the original data were divided by the each mean value at each channel , which can clean a large part of horizontal branch of grid - texture on spectrum . secondly , wavelet transform was applied to the result by the first step 為此,我們首先引入了“通道歸一化”方法,它可以有效地消除網紋結構中的橫條紋,緊接著,再對第一步處理結果實施小波濾波,結果證明,兩種主要方法的聯合應用能夠有效地去除疊加在太陽射電頻譜圖中的網紋結構和其他噪聲,得到清晰的頻譜圖。

Electromagnetic compatibility and radio spectrum matters - base stations , repeaters and user equipment for imt - 2000 third - generation cellular networks - part 1 : harmonized en for imt - 2000 , introduction and common requirements , covering essential requirements of article 3 . 2 of the r tte directive v2 . 2 . 1 電磁兼容性和無線電頻譜情況. imt - 2000第三代細胞網絡用基站中繼器和用戶設備.第1部分:包括r tte指令3 . 2條款的基本要求的imt - 2000的概要和一般要求的協調en

Utra fdd en electromagnetic compatibility and radio spectrum matters - base stations , repeaters and user equipment for imt - 2000 third - generation cellular networks - part 3 : harmonized en for imt - 2000 , cdma direct spread utra fdd covering essential requirements of article 3 . 2 of the r tte directive v . 2 . 2 . 1 電磁兼容性和無線電頻譜情況. imt - 2000第三代細胞網絡用基站中繼器和用戶設備.第3部分:包括r tte指令3 . 2條款的基本要求的imt - 2000的cdma直接擴展

Utra fdd en electromagnetic compatibility and radio spectrum matters - base stations , repeaters and user equipment for imt - 2000 third - generation cellular networks - part 2 : harmonized en for imt - 2000 , cdma direct spread utra fdd covering essential requirements of article 3 . 2 of the r tte directive v2 . 2 . 1 電磁兼容性和無線電頻譜情況. imt - 2000第三代細胞網絡用基站中繼器和用戶設備.第2部分:包括r tte指令3 . 2條款的基本要求的imt - 2000的cdma直接擴展

Cdma2000 en electromagnetic compatibility and radio spectrum matters - base stations , repeaters and user equipment for imt - 2000 third - generation cellular networks - part 4 : harmonized en for imt - 2000 , cdma multi - carrier cdma2000 covering essential requirements of article 3 . 2 of the r tte directive v2 . 2 . 1 電磁兼容性和無線電頻譜情況. imt - 2000第三代細胞網絡用基站中繼器和用戶設備.第4部分:包括r tte指令3 . 2條款的基本要求的imt - 2000的cdma多載波

Utra fdd en electromagnetic compatibility and radio spectrum matters - base stations , repeaters and user equipment for imt - 2000 third - generation cellular networks - part 6 : harmonized en for imt - 2000 , cdma tdd utra tdd covering essential requirements of article 3 . 2 of the r tte directive v2 . 2 . 1 電磁兼容性和無線電頻譜情況. imt - 2000第三代細胞網絡用基站中繼器和用戶設備.第6部分:包括r tte指令3 . 2條款的基本要求的imt - 2000的cdma tdd

Electromagnetic compatibility and radio spectrum matters - radio equipment in the frequency range 9 khz to 315 khz for ultra low power active medical implants ulp - ami and accessories - part 2 : harmonized en covering essential requirements of article 3 . 2 of the r tte directive v1 . 1 . 1 電磁兼容性和無線電頻譜情況.超低功率活性醫用植入物和附件用頻率范圍在9 khz到315 khz的無線電設備.第2部分:包括r tte指令3 . 2條款基本要求的協調en

Dect en electromagnetic compatibility and radio spectrum matters - base stations , repeaters and user equipment for imt - 2000 third - generation cellular networks - part 10 : harmonized en for imt - 2000 fdma tdma covering essential requirements of article 3 . 2 of the r tte directive v2 . 1 . 1 電磁兼容性和無線電頻譜情況. imt - 2000第三代細胞網絡用基站中繼器和用戶設備.第10部分:包括r tte指令3 . 2條款的基本要求的imt - 2000的fdma tdma

Electromagnetic compatibility and radio spectrum matters - maritime mobile earth stations operating in the 1 , 5 ghz and 1 , 6 ghz bands providing voice and direct printing for the global maritime distress and safety system - technical characteristics and methods of measurement v1 . 1 . 1 電磁兼容性和無線電頻譜情況.全球海上遇險呼救與安全系統用提供聲音和直接打印的工作頻帶為1 . 5ghz和1 . 6ghz的海上移動地面站.技術特性和測量方法

Electromagnetic compatibility and radio spectrum matters - meteorological aids met aids - radiosondes to be used in the 400 , 15 mhz to 406 mhz frequency range with power levels ranging up to 200 mw - part 1 : technical characteristics and test methods v1 . 1 . 1 電磁兼容性和無線電頻譜情況.計量輔助設備.功率電平范圍不大于200mw的400 . 15mhz至406mhz頻率內使用的無線電探空儀.第1部分:技術特性和試驗方法