必要頻帶寬 的英文怎麼說
中文拼音 [bìyāobīndàikuān]
必要頻帶寬
英文
necessary bandwidth-
Though wide - band has been used widely, it ' s not wide enough to watch high - quality real - time video. futhermore, wiless communicaton has become a hot technology, it has limited band and unstable communication channel which result in high percentage of errorness in this situation, if people want to watch realtime video, it has high demand that video producer compress the video as small as possible when quality is good enough and receiver have ability of error resilience
另外，無線通信已經成為當前it領域的一個大熱點，對無線通信來說，帶寬就更加有限，並且傳輸線路不穩定，錯誤率高，在這種情況下，如果想通過無線網路在線觀看視頻，必然需要視頻發送端在保證質量的情況下對視頻進行盡可能的壓縮，同時提供強大的糾錯和抗錯能力。Frequency diversity technique is effective in suppressing age if the frequency interval is big enough to remove off the correlation between the pulses transmitted by radar, wide - band mmw radar can satisfy the requirement but conventional microwave radar can t
頻率分集技術抑制目標角閃爍的有效性，取決于去除脈間相關性的性能，即要求雷達發射信號必須有較大的頻率間隔，寬帶毫米波雷達正好滿足了這一常規微波雷達不能滿足的要求。The event gave us a good opportunity to discuss the processes of magnetic change, energy release and particle acceleration in the corona during the preflare, especially using decimetric and microwave fine structure data. in this thesis, we report the solar type iv bursts and its associated fiber fine structures recorded on 14 july 2000
中國國家天文臺懷柔觀測站的寬帶頻譜射電望遠鏡，觀測到了來自內日冕區的射電爆發及其精細結構，攜帶著耀斑爆發初期磁場變化、能量釋放的豐富信息，很有必要對其進行深入的理論分析和計算。In addition, for a dispersive high frequency system, because of the requirement of the phase in - step between the beam and electromagnetic wave, the bandwidth are expected to be located in a narrow range
另外，對干填充等離子體的色散高頻系統，由干電子注和電磁波互作用的同步要求，系統帶寬必然分佈在某一有限范圍內。Asymmetric digital subscriber line can supply the necessary bandwidth for applications such as fast access to the internet, video conferencing, interactive multimedia, and videoon - demand. this technology is designed to solve the most severe bottleneck in the data access network between the central office and the customer, or end - user
Adsl可以為許多應用提供必要的帶寬，如快速接入internet ，視頻會議，互動式多媒體技術以及視頻點播等，可以解決在局端和用戶端之間接入網路速率讓人難以忍受的速率瓶頸問題。In the first part, the fundamentals of lfm signals are introduced. the relationship between distance resolution and bandwidth, speed resolution and signal duration are the emphases to be discussed. it indicates the importance of using lfm signals with large duration and bandwidth in uwb - sar system
全文分以下四部分：第一部分討論了線性調頻信號的基本理論，指出了距離解析度和速度解析度與信號時寬和帶寬的關系，說明了在雷達系統中採用大時帶寬線性調頻信號源的必要性。However, performance is limited by the low signal - to - noise ( snr ) and high date rate. a potential solution is to add a strong error correcting code. so studying the error correcting code on uwb system is necessary and worthy
但是超寬帶信號頻譜寬、功率低且傳輸速率很高，使其更容易受到各種干擾而影響傳輸質量，所以在超寬帶系統中研究通道編解碼技術變得非常必要和有價值。These years, with the development of network technology, broadband access became necessary to applications in home network, and it is the one that carrier company wants to push on. currently, adsl, xdsl, fttb and cable modem still have some distance to people ’ s requirement, since they ca n ' t offer enough performance and quality to net - meeting, vod and voip. ngn ( next generation network ) is open network that could provide very new services, such as audio, video and data
近年來，隨著網路技術的迅猛發展，寬帶接入逐漸成為很多家庭應用的必要設施之一，它也是電信運營商大力推廣的應用手段，當前廣泛使用的寬帶接入方案如adsl ，小區寬帶， xdsl和cablemodem與人們的需求還有一定差距，也不能為新興網路業務如視頻會議、 vod 、 voip提供足夠的帶寬以及相關業務的性能和質量保證。These years, as information technology take more and more important position in social life, broadband became necessary to home network access, and also it is the one that carrier operator wants to push on. currently, adsl, xdsl, fttb and cable modem still have some distance to people requirment, and they ca n ' t offer enough performance and quality to net - meeting, vod and voip
隨著信息技術在社會生活中的地位越來越重要，寬帶接入已經逐漸成為很多家庭應用的必要設施之一，也是電信運營商大力推廣的應用手段，當前廣泛使用的寬帶接入方案如adsl ，小區寬帶， xdsl和cablemodem與人們的需求還有一定差距，也不能為新興網路業務如視頻會議、 vod 、 voip提供足夠的帶寬以及相關業務的性能和質量保證。Finally, i simulate the performance of ldpc codes with different parameters on the uwb system. we find that the performance of ldpc codes is very good. we believe ldpc codes will become the main channel - coding scheme in the future uwb system
最後，將ldpc碼應用於ds - uwb系統，並針對不同碼長、碼率、用戶數、抽樣頻率、訓練比特數進行了計算機模擬，證實了ldpc碼具有良好的糾錯性能，必將成為未來超寬帶uwb系統主要的通道編碼方案。分享友人