符號間干擾 的英文怎麼說

中文拼音 [fúháojiāngānrǎo]
符號間干擾 英文
intersymbol interference
  • 符 : Ⅰ名詞1 （符節） tally （with two halves made of wood bamboo jade metal issued by a ruler to gener...
  • 號 : 號Ⅰ名1 （名稱） name 2 （別號; 字） assumed name; alternative name3 （商店） business house 4 （...
  • 間 : 間Ⅰ名詞1 （中間） between; among 2 （一定的空間或時間里） with a definite time or space 3 （一間...
  • 干 : 干Ⅰ名詞1 （事物的主體或 重要部分） trunk; main part 2 （幹部的簡稱） short for cadre Ⅱ動詞1 （做...
  • 擾 : Ⅰ動詞1 （擾亂; 攪擾） harass; trouble 2 （客套話 因受人款待而表示客氣） trespass on sb s hospital...
  • 符號 : 1 （記號; 標記） character; sign; symbol; mark; code; notation; expression; denotation; sentinel ...
  1. The intelligent time relay is intelligent double row four location display instrument, it is the operation of three keys, have the function of single setting double setting time, it applies special technique to resist interference, avdvanced craft, high technology, satisfied the clients need. its the new product which assimilate the nation and internationals same products character

    名稱： sng智能時間繼電器sng智能時間繼電器是智能型雙排四位顯示儀表，儀表為三鍵操作，具有單雙時間設置，參數設置快捷，符號顯示簡潔，儀表採用進口超強抗干擾晶元設計質量可靠。
  2. Isi inter symbol interference

    符號間干擾
  3. Secondly, we propose a multi - user detection based on kurtosis. this method can suppress not only mai ( multiple - access interference ) but also isi ( inter - symbol interference ). all needs in the detection are only the desire user ' s spreading code

    並在此基礎上，提出了一種基於峭度的盲檢測方法，這種方法不但可以抑制多址干擾mai （ multiple - accessinterference ） ，還可以抑制符號間干擾isi （ inter - symbolinterference ） ，而且在檢測時只需要期望用戶的擴頻碼信息，是一種全盲檢測方法。
  4. For wireless communications, direct sequence code division multiple access ( ds - cdma ) techniques have received a great deal of attention due to the expectation of capacity increase, interference rejection capability, security, and so on. in a high data rate application such as multimedia services, however, the capacity of ds - cdma systems is limited by both the inter - chip, or inter - symbol interference

    Cdma技術以其高抗干擾能力、高容量、高保密性等技術優勢在第三代移動通信系統中被廣泛應用，然而在高速數據業務中，嚴重的碼間干擾和符號間干擾會導致系統性能明顯下降。
  5. In order to achieve high data rates on the severely band - limited underwater acoustic ( uwa ) channels, bandwidth - efficient modulation techniques must be employed, together with some sophisticated signal processing algorithms, such as adaptive equalization technique for the intersymbol interference caused by channel multipath propagation

    在帶寬嚴重受限的水聲通道中實現高數據率通信，必須使用高帶寬利用率調制技術，並結合自適應均衡等技術以有效地克服通道多途傳播產生的符號間干擾。
  6. For example, carrier frequency offsets, which are caused by the inherent instabilities of the transmitter and receiver carrier frequency oscillators, can lead to severe system degradation due to inter - carrier interference ( ici ). symbol timing synchronization must also be achieved in order to avoid inter - symbol interference ( isi )

    其載波頻率誤差會引入子通道之間的干擾（ ici ） ，而幀同步的誤差會引入符號間干擾（ isi ） ，同時還會對通道估計帶來嚴重的影響。
  7. This thesis analyzed the error performance of mfsk and mpsk modulator in hf with optimal receiver, studied the shortcoming and strongpoint of several typical short - wave data transmission systems and their performance over fading and intersymbol interference channels. the theory and key technical of adaptive modem is discussed. in the last, an efficient modulation scheme - block coded modulation is introduced into hf radio systems to improve the efficiency of hf data transmission, this paper also proposes a hf data transmission system scheme composed of a block coded modulator and a decision feedback type adaptive equalizer

    本文在對短波數傳兩種常見調制方式fsk及psk最佳解調性能分析的基礎上，討論了幾種採用典型調制技術的短波數傳系統（如時頻調制、多進制頻移鍵控慢跳頻、 chess系統）原理、優缺點以及抗衰落和抗符號間干擾的性能；分析了自適應串列數傳系統抗短波通道衰落和多徑干擾的原理、關鍵技術；在本文的最後引入一種有望解決短波數傳系統低效率狀況的調制方式bcm -分組編碼調制，給出了一個採用bcm技術與自適應均衡技術相結合的短波數傳系統方案，並通過計算機模擬進行了初部驗證。
  8. 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。
  9. Although the long pn sequence modulation has been used widely in the military communication with the good secrecy performance and restraint of jam between symbols, there is scarcely any research of long pn sequence modulation signals. so it is significant to research the estimation of long pn sequence modulation signals

    由於目前尚未有對長pn碼調制信號進行檢測和參數估計的研究，而長碼調制較好的保密性能以及抑制部分符號間干擾的優點，使其在軍事通信中有著較好的應用前景，因而此部分工作具有重要的意義。
  10. In this dissertation, multiuser detection and space - time processing are combined to suppress multiple access interferences and inter - symbol interferences ( isi ) jointly in multipah fading channels with large delay spread

    本文組合多用戶檢測和空時處理技術，在大時延擴展的多徑衰落通道條件下，研究多址干擾和符號間串擾的聯合抑制。
  11. The 3rd generation ( 3g ) mobile communications system and part of the 2nd generation ( 2g ) mobile communications use pn sequences or walsh codes as spread codes, and their system capacities are limited by the multiple access interference ( mai ) from asynchronous transmitted signals

    採用pn序列和walsh碼進行直序列擴頻的第三代和部分第二代cdma移動通信系統，其容量受到異步傳輸時多址干擾的限制，其數據率因在n個碼片的時間內只能傳輸一個數據符號而受限。
  12. Stfs is a good coding arithmetic which is simple and easy to realize. moreimportantly stfs has higher diversity order and encoding gain than sts at the samesymbol rate. it can repel channel fading, improve data rate and wireless systemcapacity availability, stand against frequency selectivity fading, eliminate theintersymbol interference

    該編碼演算法不僅在方法和原理上簡單，而且易於實現，在相同符號率下比空時擴頻具有更大的分集度和更高的編碼增益，能有效抵抗通道衰落、提高數據速率、提高無線系統容量、很好的對抗頻率選擇性衰落和消除符間干擾。
  13. When ccc are used for spreading codes, multiple access interference ( mai ) is zero theoretically even under asynchronous transmission. if cc / ccc are used for spreading codes, one data symbol could be transmitted during one - chip duration

    若採用互補碼作為擴頻碼，理論上而言，不管在同步模式還是異步模式下，都不存在多址干擾；又可用特殊的調制方式做到在1個碼片的時間內傳輸一個數據符號。
  14. The author mainly takes charge of hardware design of the system. in the design, takes the methods of designing signal amplifier and signal acquisition on different circuit boards. this design method deals with analog signals and digital signals separately which satisfies the request of digital instruments design, and resolves the problem of cross - interference between analog signals and digital signals, so the anti - interference ability of the system is greatly improved

    作者主要負責進行該系統硬體設計，在硬體電路設計中，採取將生物信號放大器和生物信號數據採集板分開設計的方法，這種將模擬信號與數字信號分開處理的硬體實現方案符合數字化儀器的設計要求，解決了不同性質信號間的相互干擾問題，使系統的抗干擾性能大為提高。
  15. 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
分享到 Line

分享到臉書