downlink and uplink 中文意思是什麼

downlink and uplink 解釋
下行鏈路與上行鏈路
  • downlink : 下傳
  • and : n. 1. 附加條件。2. 〈常 pl. 〉附加細節。
  • uplink : n. 【宇航】（從地面向航天器或衛星傳送數據或信號的）上行線路。vt. （從地面）向上傳送（數據、信號等給飛行器或衛星）。
  1. New satellite tv uplink and downlink licence granted

    政府發出新星電視上行及下行牌照
  2. B3g designs a flexible frame which can adapt to different data transfer rates between downlink and uplink and can adapt to variable mobile speed

    B3g設計了適用於上下行不同數據量要求的幀結構，以及適用於不同移動臺速度的時隙結構。
  3. Hsdpa is written in release5 to increase transmit speed in certain time. as researchers found that the amount of data between downlink and uplink is unequal, and the former one has a larger amount than the latter one

    針對3g系統中不對稱的上下行傳輸，下行鏈路業務量普遍大於上行鏈路業務量這一典型特徵， 3gpp在release5協議版本中提出了hsdpa概念，旨在提高某一時刻的傳輸速率。
  4. In this paper, after introduction of the code division multiple access ( cdma ) and orthogonal multicarrier ( mc ) technique, the system model of mc - cdma is analyzed and the bit error rate ( ber ) performance in downlink and uplink channel is shown in awgn channel by computer simulation

    本文在碼分多址技術和正交多載波技術原理基礎上，分析了高斯白噪聲通道中多載波碼分多址（ mc - cdma ）系統的數學模型，並且使用不同的擴展碼對下行通道和上行通道誤碼率性能分別作了計算機模擬分析。
  5. Hsupa ( high speed uplink packet access ) is the new technique of r6, first in this thesis, the hsupa physical layer is introduced in detail. then base on the physical layer technique characteristic, according to the 3gpp simulation requirements and system simulation requirements, the hsupa downlink and uplink can be constructed by using matlab. then the data channel and control channel can be simulated, so the channels performance can be realized, provide the results can be provided to the system simulation, these ground the future practical applications

    Hsupa （ highspeeduplinkpacketaccess ） ? ?高速上行分組接入就是r6版本中的新技術，本文首先詳細介紹了hsupa物理層的技術特徵，然後以其技術特點為依據，按照3gpp的模擬需求和系統級的模擬需求，使用matlab構建hsupa的上下行物理層鏈路，對其數據通道和控制通道進行模擬驗證，從而了解通道的性能，為系統模擬提供模擬數據，為以後的實際應用打下基礎，達到預研的目的。
  6. Smart antenna has two critical tasks, one is to filter the uplink signals, and the other is to form the downlink beam, and we need adaptive algorithm and digital signal processing ( dsp ) technology to fulfill these work. adaptive algorithm is one of the most important technologies of smart antenna, and it determines smart antenna ' s speed to the wanted to signal and the complexity of the circuit of the communication system

    自適應演算法是智能天線的核心技術之一，它決定著智能天線對來波信號響應的速率和系統實現電路的復雜程度，系統需要針對各種通信環境來選擇合適的演算法，也可以採用演算法分集的方法來使整個系統工作在最佳狀態。
  7. Compared with the fdd system, td - scdma adopting tdd, has no need of symmetrical frequency bands for uplink and downlink, and enables flexible and convenient planning and use of increasingly scarce spectrum resources

    與fdd系統相比， td - scdma採用時分雙工方式，上下行無需對稱頻段，可以見縫插針，靈活方便地規劃使用日益緊張的頻譜資源。
  8. Wireless wide - area networks ( wwans ) are charactered by very low and variable bandwidths, very high and variable delays, significant non - congestion related loss, asymmetric uplink and downlink channels, and occasional blackouts. additionally, the majority of the latency in a wwan connection is incurred over the wireless link

    無線廣域網（ wwans ）由於以下特徵而有別于有線廣域網（如internet ） ：較低並且易變的帶寬，很高且易變的延遲，與擁塞無關的數據丟失，非對稱的上行和下行通道，以及偶爾的昏眠狀態，此外，在無線廣域網上的大部分的延遲發生在無線連接部分。
  9. Coupling can happen at different places of the uplink and downlink channels

    上下行通道之間產生耦合的原因有多種，避雷設施的安裝不當也是其中之一。
  10. 4. we propose that the best detection method for the uplink mc - cdma system is decorrelating - parallel interference cancellation ( dec - pic ) multiuser detection, and the best detection method for the downlink mc - cdma system is minimum mean square error combining ( mmsec ) single user detection

    提出上行通道mc - cdma的最佳檢測方法是解相關-并行干擾抵消多用戶檢測法（ dec - pic ） ，在下行通道mc - cdma的最佳檢測方法是最小均方誤差合併單用戶檢測法（ mmsec ） 。
  11. 3. we propose a new spreading sequence design scheme. in the uplink, using golay sequence, cinew sequence or zadoff - chu sequence, in the downlink, using wh sequence as the spreading sequence, we can control the papr of mc - cdma below 7db and ber below le - 3 ( snr = 20db )

    提出mc - cdma中擴頻序列的新型設計方案，在上行通道，採用golay序列， cinew序列或zadoff - chu序列，在下行通道，採用wh序列作為擴頻序列可以控制mc - cdma峰平比在7db以內，在信噪比為20db時，系統誤碼率小於1e - 3 。
  12. So, at the frequency 1920mhz, phs will be adjacent to wcdma uplink, there will be fairly strong adjacent channel interference between them, compared to phs and wcdma downlink, which could be neglected

    Phs系統將緊鄰wcdma系統的上行頻帶，在1920mhz頻點附近兩系統將會對彼此產生比較強的鄰頻干擾，由於頻帶距離較遠，可以忽略wcdma下行頻帶和phs之間的干擾。
  13. Then we conclude that the cell capacity decrease dramatically under the high bit rate service ; the interference factor of ajacent cells and the orthorgonal factor are also important parameters to influence the cell capacity ; the downlink can accept more users than uplink, so the capacity of wcdma system will be limited in uplink

    從中得到結論，高數據速率的用戶將會佔用更多的系統資源，當數據業務增多時，小區用戶數下降很快；鄰近小區的干擾與正交性的優劣也是影響小區容量的重要因素；下行鏈路可以比上行鏈路容納更多的用戶，因此wcdma系統的容量將受限於上行鏈路。
  14. The algorithm solves the question of frequency difference between uplink and downlink

    解決了上、下行鏈路的頻差問題。
  15. The paper will introduce the structure of the ssr mode s air - ground data link. it details the work courses of the dce ( data circuit - terminating equipment ), xdce ( gournd / air data circuit - terminating equipment ), reformatting process, sse ( mode s specific services entity ), and snme ( mode s subnetwork management entity ). and it details the process of uplink and downlink frame

    詳細介紹了dce （數據電路終端設備） 、 xdce （地面/機載數據電路終端設備） 、數據包的格式轉換、 sse （ s模式特殊服務實體）和snme （ s模式子網管理實體）的工作過程，還介紹了上行/下行幀的處理，和s模式子網中系統間的數據交換介面。
  16. On condition that all packets can be received successfully, the basestation dynamically schedules uplink and downlink traffic to achieve efficient sdma. approximate analysis of channel utilization is presented

    結果表明， asama協議能有效支持多波束智能天線應用以實現通道空分復用，具有很高的通道利用率與良好的時延性能。
  17. Tdd - cdma has so much technology advantage such as high spectrum effectiveness, big capacity, supporting asymmetrical uplink and downlink and so on, that it can especially solve the problem of some areas in our country which have overpopulation and scarcity of spectrum resource

    Tddcdma技術具有上下行鏈路不對稱、頻譜利用率高、發射功率低等優點，非常適合於第三代移動通信中的非對稱數據業務，並可以提供較高的系統容量，特別是能夠滿足我國一些地區人口密集而頻譜資源緊張的需要。
  18. We designed a wireless asymmetric physical layer link model with a direct sequence spread spectrum system as a transmitted reference. uplink and downlink are both one - way links connected by an ip tunneling. uplink is consisted with the narrowband radio data link of the warfighter information networks ( win )

    研究了無線非對稱鏈路，提出了一種用參考法直接序列擴頻（ dsss ）實現的無線非對稱數據傳輸的物理層鏈路模型：利用現有戰斗員信息網電臺的窄帶數據鏈作為上行通道，通過ip隧道技術保證單向鏈路的連通性。
  19. The procedure to remove cross - pol interference is usually to determine where the interference come from, and then to adjust the polarization angle of the relative uplink or downlink antenna

    排除反極化干擾的步驟通常為，判斷干擾源自上行抑或下行，然後調整失調天線的極化角。
  20. Hong kong provides dedicated relay services for multinational companies, international press agencies and tv channels to downlink or uplink their satellite signals over the asia pacific region

    香港為跨國公司、國際通訊社及電視臺提供專用轉播服務，為他們在亞太地區上傳及下傳其衛星訊號。
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