sdma 中文意思是什麼
sdma
解釋
對稱二甲基精氨酸-
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。 -
Simulation results show that abf - csma / ca protocol can realize space - division - multiple - access ( sdma ) and provide very high channel utilization. chapter 3 considers employing smart antennas in the central access point ( cap ) of wireless internet access networks
第三章研究了智能天線在internet無線接入網路中的應用，主要考慮使用智能天線對抗同通道干擾與多徑衰落，增加覆蓋范圍，並在mac層實現智能天線與網路的有機結合。 -
Due to the data transmission characteristics between tags and reader, space division multiple access ( sdma ), frequency division multiple access ( fdma ) and code division multiple access ( cdma ) are applied in a limited way in rfid system. therefore, time division multiple ( tdma ) has been generally accepted. according to tdma, there are aloha protocol, s - aloha, binary - tree protocol, clipped binary - tree protocol and others
解決這個問題必須要用到多路存取法，針對射頻識別系統中閱讀器與應答器之間的通信特點，空分多路法、頻分多路法、碼分多路法在rfid系統中應用都受到一定的限制，只能應用到一些特定的場合，一般採用時分多路法，按照時分多路法的演算法有aloha演算法、時隙aloha演算法、二進制樹型搜索演算法、修剪枝的二進制樹型搜索演算法等防碰撞演算法協議，分析了各自特點以及存在的缺點。 -
Hc - sdma high capacity - spatial division multiple access hc - sdma
大容量-空分多路存取 -
On condition that all packets can be received successfully, the basestation dynamically schedules uplink and downlink traffic to achieve efficient sdma. approximate analysis of channel utilization is presented
結果表明， asama協議能有效支持多波束智能天線應用以實現通道空分復用，具有很高的通道利用率與良好的時延性能。 -
Previous research on the ad hoc network almost aim at omnidirectional antenna of all receivers and transmitters, or as a default attribution. in my thesis, firstly i describe the advantages of the directional antenna at many aspects which including spatial division multiple access ( sdma ), the antenna gain, anti - interference etc. and analyze the possibility about the directional antenna used for the ad hoc networks, secondly i study its multiple access and routine protocols using the directional antenna. and compare the protocol difference and network " performance between omnidirectional and directional antenna in particular environment
首先闡述了定向天線在網路空分復用（ sdma ） 、天線增益、抗干擾等方面的的優勢，分析了定向天線用於移動自組網的可行性，接著重點研究了基於定向天線的多址接入協議和路由協議，分析了與全向天線在組網和協議實現中的異同點和優缺點，並對特定的環境下的網路性能作了對比。 -
Brief introduction of sdma 2006 spray forming rapid prototype technology
噴射成形快速原型技術 -
Beamforming comes from smart antenna with strengthening desired signal and suppressing inter - users interference as its typical technical superiority. it is also the base to realize sdma ( space division multiple access )
波束形成技術源於智能天線、增強期望、抑制用戶干擾是其典型的技術優勢，也是sdma （ spacedivisionmultipleaccess ）能夠得以實現的基礎。 -
Smart antenna adopts sdma, and in terms of the difference of transmission direction, it can distinguish signals of the same frequency and the same time interspace. smart antenna can enlarge cacacity greatly, and has become a key research topic of many countries nowdays. this dissertation makes a detailed introduction of smart antenna in the wireless communication system, mainly in the cdma system, and the influence of smart antenna on cdma system capacity is also analyzed. the dissertation is made up of six chapters : chapter 1 simply discusses the history of wireless communication and the three criteria of cdma, and introduces smart mobile communication technique
它可以成倍地擴展通信容量，已經成為當今世界各國的重點研究對象。本文對無線通信系統主要是cdma系統中的智能天線的技術特點做了詳盡介紹，對智能天線對cdma系統容量的影響做了細致分析。全文共分六章，安排如下：第一章簡述了無線通信的歷史和三種cdma標準，介紹了智能移動通信技術的一些內容。 -
Sdma space division multiple access
空分多址 -
This method may use in the sdma and cell location system
此方法對蜂窩定位，空分多址系統的實現也有實用價值。 -
Space division multiple address sdma
空分多址 -
Space division multiple access sdma
空分多址
分享友人