high frequency carrier system 中文意思是什麼
high frequency carrier system
解釋
高頻載波系統-
The research on bypass carrier wave protection not only possess his theory value - studied protector ' high frequency signal as well as and dispatch signal logic, penetrate into learn protector ' occlusion type carrier wave protection logic about, but also has important signality in fact ? rovide practice system operation scheme with theory and test evidence
對旁路代路時高頻保護配對方案的研究不僅具有其理論價值?對保護裝置的高頻信號以及收發信邏輯進行研究，深入了解保護裝置的閉鎖式高頻保護邏輯，而且具有較大的現實意義?為實際系統運行方案提供理論和試驗依據。 -
It is the first time to use the conventional espi system ( neither phase shifting nor carrier is used ) to continuously analyze the super low frequency vibration with high quantitative in the world
在火箭固體燃料動態力學特性研究中，時間序列法成功的給出了固體燃料的蠕變曲線和蠕變速率曲線，並且給出了其熱變形和蠕變不同時刻的全場位移分佈。 -
Aimed at the characteristics that multi - carrier transmission is sensitive to frequency offset and require high synchronization performance, firstly multi - carrier ofdm technique is introduced, the influence of synchronization offset to ofdm system is analyzed and two kinds of typical synchronization methods are given based on pilot and cp in the paper
針對多載波傳輸對載波偏移敏感，對同步要求高的特性，論文首先介紹了多載波ofdm技術，分析了同步偏移對ofdm系統性能的影響，給出了基於導頻和循環前綴的兩種典型的同步方法。 -
With this tech, we design a high - efficient & robust mfsk data transmission system. but in frequency diversity of mfsk system, it is very difficult to tell which diversity is the correct carrier frequency. now we use the temporary phase swift ( ips ) method to solve the difficulty
在2000年，美國海軍成功通過水聲鏈路並接入internet網路發送e mail ，這具有重要的戰略意義；從科學技術發展的角度來看是喜訊，但對我們這樣一個海洋大國來說，更現實的意義在於鞭策自己的科研工作。 -
The main results and creative points in the dissertation were as follows : a ) by means of studying on the fiber - optic hydrophones ’ tdm array based on phase generated carrier ( pgc ) demodulation with laser frequency modulation, the mathematic models were set up, used for theoretical analyses of noncoherent crosstalks in the system using low coherent laser and coherent crosstalks in the system using high coherent laser. the formulas calculating crosstalks were given, and the method measuring crosstalks was shown definitely
本論文的主要研究結果和創新在於: 1 、通過對基於光頻調制pgc （相位生成載波）解調光纖水聽器時分復用系統的研究，針對低相干光源的串擾強度迭加和高相干光源串擾的相干迭加，建立了理論分析的數學模型，得出了計算串擾的公式，明確了測試系統串擾的方法。 -
Firstly, in wireless environment, receiver has no know the time delay between transmitter and itself. in ofdm system, ofdm data is transmitted as one symbol, so in order for correct demodulation, the correct start of symbol should be got from ofdm system to reduce the effect of isi. secondly, the high frequency utilization in ofdm is based on the orthogonal properties of sub carriers. if frequency offset is generated, the orthogonal properties among sub carriers will lost, that will cause inter carrier interference ( ici ) and high ber of system
Ofdm技術也存在著一些缺陷，首先，在無線環境中傳輸的ofdm信號對定時要求高，為了減少碼間串擾（ isi ）影響，必須從接收信號中提取出正確的符號起始位;其次， ofdm系統對頻率偏移敏感， ofdm技術的高頻譜利用率和傳輸可靠性均以子載波的正交性為基礎，如果接收機和發射機之間發生頻率偏移，子載波之間就會失去正交性，導致嚴重的子載波間干擾（ ici ） ，降低系統性能。
分享友人