multi access 中文意思是什麼
multi access
解釋
多踟存取的-
Yangzhou fukedu hotel is the first express style commercial and tourist hotel, witht the convenient transportation, is located at yangzhou yingbin avenueside jiangyang road and yangzi river road acrossing, eightfold main buildings are opposite new century hotel, the hotel has large - scale parking, medium and small - sized meeting room, multi - purpose hall. moreover, it possesses 88 guest rooms designed by glazing unit window, are equipped with the full facility of 24 - hour hot water, air conditioning, separate bathroom, cable television, ip telephone, broadband internet access, fire and burglar alarm installation. as long as you lodge in yangzhou fukedu hotel, let you feel concise, convenient, confortable, safe and economic
福客都酒店是揚州市首家快捷型商務旅遊酒店，座落在揚州迎賓大道旁江陽路與揚子江路交叉口處，交通便利，八層主樓與新世紀大酒店遙遙相望，酒店擁有大型停車場中小型會議室多功能廳，客房88間，中空玻璃窗戶， 24小時熱水，設施完善，環境優雅內設單人房標準房套房等，房內配有空調有線電視獨衛ip電話寬帶上網火災及防盜報警等設施一切讓您感到簡潔方便舒適安全經濟，是您及您的貴客下榻休息的理想場所。 -
Catering / launderette / conference room / internet access / multi - functional room / common room / kiosk / business center / rent - a - bike / team building obstacies course / barbecue facilities
餐飲服務洗衣服務會議室電子閱覽室多功能廳休閑廳超市商務中心出租自行車拓展訓練設施露天燒烤 -
This paper briefly describes the extension of point - to - point communication link to node - connected communication network and of multiplex to multi - access technologies
摘要概述了從點點線路至結點聯成通信網和從多路技術至多址技術的發展過程，解釋了光纖通信網發掘利用潛在容量以及建立未來高速通信網的關鍵問題。 -
The smart antenna, which is adapted in the wireless mobile communication system, in fact, forms an antenna with a high gain. thus communication in all directions can be proceeded, then base station antenna coverage, system capacity and service quality are improved, also inter - symbol interferes and multi - access interfere are reduced. the space division multiple access ( sdma ) is introduced, and users can be distinct from each other through their special location
在無線移動通信系統中採用智能天線技術，實際上是通過數字信號處理，使天線陣為每個用戶自適應地進行波束賦形，相當于為每個用戶形成了一個可跟蹤它的高增益天線，從而即可以進行全方位通信，也可以用較小的發射功率覆蓋相同的范圍以及提高系統容量和業務質量、降低用戶間的碼間干擾和多址干擾。 -
The advantages of using leo satellite are as following : on the one hand the satellite orbit is low, so the transmission delay is short, the power loss is small ; on the other hand the development of cell communication, multi - access, frequency multiplex and etc also provide a technique guarantee to the leo satellite - mobile - telecommunication. so the leo system is considered to be a satellite - mobile - communication system with a great future
低軌道衛星是一種運行於1000公里左右的高空中的人造衛星，利用leo衛星實現個人通信的優點在於：一方面衛星的軌道高度低，使得傳輸延時短、路徑損耗小，多個衛星組成的星座可實現真正的全球覆蓋，頻率復用更有效：另一方面蜂窩通信、多址、點波束、頻率復用等技術的發展也為低軌道衛星移動通信提供了技術保障。 -
Bst - ant - g0 series access product is one long range device which is compatible with the iso15693, and can choose strong or weak configuration. several antennas connecting with one same reader can compose multi - access product
Bst - ant - g0系列通道產品符合iso15693標準的長距離識別設備，強弱配置均可選，多套天線可同時連接于同一臺讀寫設備，組成多通道產品。 -
With the trend that cdma will be the dominant multi - access scheme in the new generation of wireless communication, how to apply spatial processing in cdma system has been becoming the emphasis of research in smart antenna. a proper method is space - time processing due to the space - time structure of wireless channel. beamforming can be combined with rake to form 2d rake receiver, which can effectively weaken the enhancement of mai in conventional rake receiver. however a more effective method is to use space - time filtering. these two scheme will be discussed and the structure and realization will be presented
碼分多址技術逐漸成為新一代通信系統的主流多址技術，如何在碼分多址系統中引入空域處理以改善系統性能是當前智能天線技術研究的重點之一.考慮到無線通道的時空二維結構特徵，一種合理的實現方式是採用時空處理方法，將波束形成技術與時域分集技術相結合;另一種更有效的方法是在接收端採用時空二維聯合處理，對無線通道進行時空二維均衡 -
Multi - access signal detection for frequency hopping based on interference subspace estimation
基於干擾子空間估計的跳頻多址信號檢測 -
Then we introduce pulse position modulation ( ppm ) using pn code and analysis its multi - access performance, system capacity and power spectrum density. on the basis of those analyses, we study the pulse shape and the anti - jamming ability of the system. at last, multiple access with pseudochaotic time hopping is introduce
本文首先闡述了uwb脈沖通信系統的基本原理，重點介紹了用偽隨機碼跳時的ppm （脈沖位置調制）調制，分析了他的多址性能、系統容量和功率譜密度，在此基礎上研究了改進性能的發射信號形狀和系統抗干擾能力，最後介紹了偽混沌碼跳時的多址方式。 -
Finally, the paper discusses the effect of fiber dispersion and non - linear characteristics on the operation of multi - access systems
著重解釋光纖本身的色散與非線性特性對波分多路波分多址系統運用的影響。 -
The system has a good security and can prevent the pervasion of mistake code, has a well anti - jamming ability and so on. some substantial and groping work has been done in the process of using chaos security communication in pulse wireless system and the multi - access communication of chaotic pulse position modulation
系統具有很高的保密性，具有防誤碼擴散，抗干擾能力強等特點，同時也為混沌保密通信應用於脈沖無線電系統以及混沌脈沖位置調制的多址通信方面做了一些實質性和探索性的工作。 -
After observing the correlative of pseudo noise code, we analyse the main cause of multi - access interference, and build the receiving model of multiuser system. in the thesis the optimum multiuser detectors with minimum probability of error and the near - optimum detectors are intrduced, and then pic multiuser detection is improved on
介紹了最佳多用戶檢測器和次最佳多用戶檢測器，並對現有一些并行干擾抵消多用戶檢測器進行了介紹並提出了改進的措施。對採用改進的演算法的系統用montecarlo演算法進行了誤碼性能分析。 -
Conventional detector ( single - user matched filter ) distinguishes each user by the crosscorrelation of their spread - spectrum codes. in practice, however, its performance is much deteriorated due to the existence of noise in channel and strong multi - access interference, i. e. near for effect. a new method using independent component analysis is proposed in this paper. the - received energy of signals is controlled effectively, thus the near - far effect is overcome as much as possible ; moreover, the effect that noise imposed on the detector is mostly reduced. simulations verify the effectiveness of this method
傳統檢測器（單用戶匹配濾波）利用擴頻碼之間的互相關特性來區分各用戶信號.而在實際應用中，通道噪聲和近距離用戶對遠距離用戶的強多址干擾即遠近效應，使得接收機的性能受到很大影響.本文將獨立分量分析法引入傳統接收機，有效控制接收信號的能量，從而極大地提高了接收機的抗遠近性能，同時噪聲的影響被盡可能消除.模擬結果表明了該方法的有效性和可行性 -
Then taken four kinds of maps for examples, comparing with m - sequence, their properties are calculated, verifying the advantages of the chaotic sequence generated by the new method. after this, an improved scheme is discussed - - using m - sequence to change the sequence ’ s turn and verifying that the permutation parameters have effect on improving the sequence ’ s properties. in chapter 5, monte carlo simulation method is used to test performances of our sequences ’ applications in the given model of direct spread spectrum cdma system, and results of error rate of the system are given ; the comparing resuls of performances of anti - multi - access interference and anti - multi - address interference of different pn sequence is also shown in this thesis
本文首先對擴頻通信中常用二進制偽隨機序列的產生方法、性能特點進行了總結，指出了現有二進制偽隨機序列的應用局限性;其次，根據混沌非線性系統特徵，深入研究了混沌數字序列的產生方法;在此基礎上，提出了一種新的產生方法中間抽取法，然後，以四種混沌映射系統為例，對其所產生的混沌數字序列進行了偽隨機特性實驗數據分析，並與m序列進行比較，結果說明了混沌數字序列代替傳統擴頻序列的優點，同時驗證了新方法的可行性。 -
If the correlation of fferent spread spectruin codes is not zero, ther would be multi - access interference. additionally, cdma conunwhcation system is a intefference - limited system, tha is to say that the interference directly influences the capabi1ity of dris system and the qos of the user in the system. in order to rid the nearfar problem and muti - access intehae, power control plays an impohan role
若用戶間的互相關不為零，則會導致多址干擾的產生；另一方面，由於cdma系統是干擾受限的系統，即干擾程度直接影響到系統軟容量和系統內用戶服務質量的高低，為了有效地克服遠近效應和多址干擾的影響，採用一定的功率控制技術則顯得尤其重要。 -
Due to a lot of inherent advantage of it, cdma has become the main multi access system for the 3 generation mobile communication system. the network - based tdoa location technique is the prevailing location technique in cdma system
Cdma固有的諸多優點使其成為第三代移動通信系統的主流體制，基於網路的到達時間差（ tdoa ）定位是cdma系統中具有廣闊前景的移動臺定位技術。 -
So cdma is irrefutablely competitive. however, the capacity of conventional cdma communication system is confined by multi - access interference ( mai ) and multi - path interference ( mpi )
但是cdma的容量卻受限於多址干擾與多徑干擾，而多載波技術具有很強的抗多徑干擾的能力。 -
The spread spectrum technology has got wide usage upon communications, telemetry, and orientation because of its strong anti - interference ability, low probability of being intercepted and captured, strong discrimination ability, outstanding multi - access communication ability, and excellent secrecy
直擴通信技術由於具有很強的抗干擾能力、很低的被截獲概率、很高的距離鑒別力、良好的碼分多址通信能力和很好的通信保密性等特性，在軍事民用通信和遙測、定位領域得到了廣泛的應用。 -
However, in cdma system there are multi - path interference, multi - access interference and the interference resulted from absence of synchronization which will limit the user content of the system. so based on the theory of complementary series and ond, the essay presents a new type of spread spectrum series - modified complementary series, which has been applied in cdma communication system
然而， cdma系統本身存在著多址干擾，多徑干擾以及由於上行線路傳輸而產生的非同步干擾等等，這些干擾隨著系統中用戶數量的增多而增加，這將大大限制cdma系統中的用戶容量。 -
This dissertation researches on wavelet theory applied to information transmission, including cdma spreading code design, waveform coding in digital modulation, over - saturated multi - access communication, diversity techniques for multi - path fading channels, and peak - to - average power ratio ( papr ) reducing methods for the wavelet packet modulation signals, etc.
本文以子波理論為工具，較深入地研究了通道傳輸方面的幾個問題，內容包括cdma擴展碼的設計、數字基帶波形成形技術、過飽和多址通信、克服衰落的分集技術和減小子波包調制信號的峰值功率/平均功率比值的方法等。
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