high frequency transmission 中文意思是什麼

high frequency transmission 解釋
高頻傳輸
  • high : adj 1 高的〈指物，形容人的身高用 tall〉；高處的；高地的。2 高級的，高等的，高位的，重要的。3 高尚...
  • frequency : n. 1. 屢次，頻仍，頻繁。2. （脈搏等的）次數，出現率；頻度；【物理學】頻率，周率。
  • transmission : n 遞送；傳遞；傳達；傳染；移轉；【機械工程】傳動；傳遞；變速器；聯動機件；【無線電】傳送；發射；...
  1. Shortwave channel is time varying transmission channel. it has dispersion in frequency and time domains. this characteristics hinds the data transmi - ssion at high speed and the correction of received data. in this dissertation i have analyzed the statistic characteristic of shortwa - ve channel, established the model of shortwave channel and simulated the rayl eigh fading distribution. the technology of spreading spetrum has been proved that it has the capability for anti - multipath and discerning multipath

    在短波通信中，由於通道的時間色散和頻率色散，引起多徑展寬和多徑衰落，前者限制了數據的傳輸速率，後者造成短波數據通信中出現突發錯誤，為了解決多徑效應對短波通信的影響，本文所做工作如下：首先詳細分析了短波通道的統計特性，建立其數學模型；其次分析了擴頻通信的特點，從理論上證明擴頻技術不僅具有抗多徑干擾能力，而且具有分離多徑的能力；介紹了傳統的rake分集合併技術的特點。
  2. By using ofdm technology, we can redu ce the baud rate with a high frequency spectrum utility factor. another advantage of this technology is that the transmission can combat the intersymbol interference ( isi ) at the receiver without complex adaptive equalizer

    Ofdm既有較高的頻譜利用率，也有效地降低了碼速率，在不使用復雜的通道均衡技術的條件下仍然可以較好地克服接收時由多徑效應帶來的碼間串擾（ isi ） 。
  3. In this thesis, for the merits of high frequency spectrum utility factor and high - speed data communication, the ofdm is introduced into the underwater acoustic communication. combined with fec to combat the frequency - selective fades and isi in the underwater acoustic channel, high speed data transmission is realized by employing ofdm technology

    本研究嘗試將ofdm技術引入水聲通信領域，利用該技術頻譜利用率高，多載波并行傳送的特點，結合通道編碼，以克服水聲通道多徑干擾引起的頻率選擇性衰落和碼間干擾，獲得高速率數據傳輸。
  4. Single carrier frequency domain equalization for high data rate transmission systems over frequency selective fading channels

    頻率選擇性通道下高速數據傳輸中的單載波頻域均衡技術
  5. Employing the interlaced scanning, current tv system can compress the frequency band of tv signal effectively and facilitate transmission. but this method reduces the scanning lines of pictures and the frequency of the field. it leads the pictures displayed on tv to have such disadvantages as large area flicker, edge flicker, interlace flicker, raster visibility and creeping line etc. to satisfy people " s vision feeling better, the big - screen, multi - function and high quality tv - set have been made great progress

    現行的廣播電視系統由於採用隔行掃描方式，從而有效地壓縮了電視信號的頻帶，有利於傳輸；但由於這種方式使得圖像的掃描行數少，場頻低，導致了重顯的電視圖像有大面積閃爍、邊緣閃爍、行間閃爍、行結構可見及行爬行等。
  6. The future wireless mobile communication systems are expected to provide ubiquitous, high - quality, and high - rate mobile multimedia transmission. however, hostile multipath fading radio conditions give rise to serious inter - symbol interference ( isi ) ; even worse, wireless channel are often time varying, which makes the system more vulnerable and more difficult to track the channel state. orthogonal frequency dvision multiplexing ( ofdm ), which is inherently resistant against isi, has invoked a popular research interest in recent years, and has been a promising candidate technology of the physical layer for future weideband high - date - rate wireless communications. notwithstanding, ofdm is much more vulnerable to errors of both time and frequency synchronization and to that of channel estimation, and how to obtain correct timing and channel estimation efficiently is highly critical to ofdm systems. the dissertation will focus on both of the aspects of ofdm systems mentioned above

    但是無線環境的多徑特性造成通信系統中嚴重的符號間干擾，同時無線通道的時變性使得通道特性跟蹤復雜。而正交頻分復用技術（ orthogonalfrequencydivisionmultiplexing ， ofdm ）正是一種解決符號間干擾的有效傳輸手段，因此ofdm技術作為未來寬帶高速率無線通信的物理層候選技術在當前引起了一股研究熱潮。但ofdm系統對定時同步誤差和通道估計誤差非常敏感，如何在ofdm系統中準確快速地實現符號同步和通道估計是至關重要的，本論文將重點針對這兩個問題進行討論。
  7. Orthogonal frequency division multiplexing ( ofdm ) is a special case of multicarrier transmission, in which a single high data rate datastream is transmitted using a number of lower data rate subcarriers

    Ofdm （正交頻分多路復用）是一種特殊的多載波傳輸方式，由於它使用一系列低速子載波并行傳輸數據，使得傳輸速率得到大幅度提高。
  8. Orthogonal frequency division multiplexing ( ofdm ) is a special case of multicarrier transmission, in which a single high rate datastream is transmitted using a number of lower data rate subcarriers

    Ofdm （ orthogonalfrequencydivisionmultiplexing正交頻分多路復用）是一種特殊的多載波傳輸方式，由於它使用一系列低速子載波并行傳輸數據，使得傳輸速率得到大幅度提高。
  9. The transmitter adopt qam modulation mode, which is a directly modulation upper frequency conversion mode, which could afford more high bit rate transmission in the same bandwidth compared to other modulation mode

    發射機採用數字式調制方式，即qam直接調制上變頻方式，相對于其它調制方式可以實現在相同帶寬下的高碼率傳輸。
  10. This series employs knot - shaped bi - phase system of high frequency driver, co - axial technology, constant pointing horn to obtain even transmission of frequency within pointing angle, and near / far field strength - adjustable dance horn technology

    採用了高音驅動器的「桔狀雙相位系統」 、同軸技術、在指向角范圍內得到均勻傳送頻率特性的恆定指向性號角，遠近聲場可變強度舞蹈號角技術。
  11. This thesis will introduce a new terahertz source which based on vacuum electronics, transmission characteristics of the high frequency system and the process of interaction between electron beam and the high frequency traveling - wave have been researched, which offers basic technology for further deep development of terahertz source technology basd on vacuum electronics in our country

    本文將介紹一種基於真空電子學的新型太赫茲輻射源器件，對其線路特性進行研究以及高頻系統中注波互作用過程進行數值模擬計算，為國內真空電子學太赫茲源的研究奠定了一定的技術基礎。
  12. Internet phone realizes the high - speed transmission and exchange of telephone subscriber ' s audio frequency dataflow by utilizing the existing computer network to make up the communication network of the telephone

    Ip電話是利用現有的計算機網路組成電話通信網路，實現電話用戶音頻數據流的高速傳輸及交換。
  13. However, to the essential of communication technology, those techniques are all change in transmission medium or channel. recently, because of the development of dsp, ifft / fft, 46 / 128 / 256qam using in high - speed modem, and gradual introduction of new coding technique, soft decision technique, channel self - adapting, guard interval, ofdm ( orthogonal frequency division multiplexing ) arouse more and more attention. as a technology of high - speed transmission, ofdm can resist isi effectively

    近年來，隨著dsp晶元技術的發展，傅立葉變換反變換、高速modem採用的64 128 256qam技術、柵格編碼技術、軟判決技術、通道自適應技術、插入保護時段、減少均衡計算量等成熟技術的逐步引入，正交頻分復用ofdm （ orthogonalfrequencydivisionmultiplexing ）作為一種可以有效對抗信號波形間干擾的高速傳輸技術，引起了廣泛關注。
  14. It can realize the circuitry ' s primary protection as well. by using it ' s high - frequency transmitter together with respective peripheral process equipments, programmable testing signals are added to the transmission channel

    該裝置通過高頻發訊機與相應外圍加工設備合成並傳送發端測試信號，于收訊機端接收此信號並分析傳輸通道故障信息。
  15. The c / s pattern can be used in the limited - ranged operations which are characterized by high security, high frequency of data processing, heavy transmission of data, good mutual - communication and fixed - places, such as the input and maintenance of graduate information, the management of code table, data backup and recovery. whereas, the b / s pattern can be used in the wide - ranged operations, which are characterized by low security requirement and mutual - communication, and flexible places, such as the release of requirement, the query of graduate information, on - line registration of graduate data and all kinds of query and statistic

    在安全性要求高、數據處理頻繁、數據傳輸量大，交互性強、地點固定的小范圍內的業務，如畢業生信息錄入及維護、代碼表管理、數據備份和恢復等模塊採用c s模式實現；而在安全性和交互性要求不高、地點靈活的廣域范圍內的業務，如需求信息發布、生源信息查詢、畢業生詳細資料在線登記和各種查詢、統計等模塊採用b s模式。
  16. The new generation of digital anti - interference transceiver mainly applies to the following digital businesses : intermediate - frequency ( if ) digitize, frequency - hopped communication, data transmission, link quality analysis ( lqa ), automatic link establishment ( ale ) and high - frequency adaptation etc. it is compatible with the former transceiver

    新一代的數字化抗干擾電臺在數字化業務上主要有：中頻（ if ）數字化、跳頻通信、數據傳輸、鏈路質量分析（ lqa ） 、自動建鏈、高頻自適應等，並與以往電臺相兼容。
  17. Recently, frequency - hop communication has been widely used in many military wireless communication domain as a secure transmission mode. in frequency - hop transmission, phase modulation system has good performance and high frequency efficiency

    跳頻傳輸模式下的數字相位調制系統具有較高的抗噪聲性能，且能有效地利用頻帶，實現數據的高速傳輸，是一種比較優越的調制方式。
  18. Utilizing phase locked loop technique with complex programmable logic devices ( cpld ), a method to perform high - speed data acquisition, storage and transmission for transformer testing, which solves the problem of data acquisition for high frequency band, is proposed

    摘要提出了利用鎖相環技術結合復雜可編程邏輯器件（ cpld ）實現對變壓器測試信號的高速採集、存儲、傳輸的方法，很好地解決了對變壓器高頻特性信號的採集。
  19. The article put forward a practical and reliable project for coins selector system on the base of essentiality of coins selector, and according to the characteristics, such as size, material of chinese coin system, designs double - way electric whirlpool sensor made of low frequency transmission electric whirlpool sensor and high frequency reflection electric whirlpool sensor to detect different characters of coins. the system realizes coins selecting with high speed and high accuracy

    本文從電渦流傳感器的原理和特性出發，根據中國硬幣體系中各幣種的尺寸、材質等特徵，結合自動售貨機的投幣器的課題進行研究，設計了一個具有學習功能的智能投幣器，實現了對硬幣的準確辨識，文中詳細地介紹了智能投幣器系統的硬體組成和軟體設計。
  20. Research on the countermeasure for the over limitation of the power frequency electric field caused by extra - high voltage transmission line

    超高壓線路工頻電場超限值對策的研究
分享友人
分享到 Line

分享到臉書