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cellular system 1.【植物;植物學】細胞組織。2.(犯人的)分隔監禁法。

cellular tissue

To solve the former problem , hiarachical cellular system ( hcs ) could be applied , where macrocells cover low - teletraffic areas and serve slow calls , while microcells overlay high - teletraffic areas and serve fast calls . by this means , better spectrum efficiency can be achieved and the number of handoffs can be decreased 對于前者,采用多層蜂窩系統( hcs ) ,使得宏蜂窩覆蓋低話務量地區并為快速呼叫提供服務,而微蜂窩覆蓋高話務量地區并為慢速呼叫提供服務,這樣既保證較高的頻譜利用效率,又能有效地降低呼叫的切換次數。

We also proposed a new call admission control ( cac ) scheme for cdma cellular system that incorporates adaptive power control and mmse multiuser receiver and support multi - class traffic . the call admission control scheme is based on estimation of othercell interference and implemented distributively in each cell . capacity determined by the admission control agrees with the actual system capacity in the simulation . the scheme can achieve high bandwidth utilization and guarantee qos requirements of all the users at the call level 為此,提出了呼叫確認策略,以保證系統中不同業務的所有用戶的qos 。呼叫控制策略在每一小區分布地進行,通過估計其它小區的干擾確定小區的可用有效帶寬,再根據小區當前的負載決定是否對呼叫請求給予確認。呼叫確認控制可以在呼叫級保證用戶的qos 。

In this dissertation , the classfication of various channel assignment scheme and the performance meritcs of channel assignment are presented , and it respectively analyzes the channel assignment which in gsm , tdd - cdma , and phs three cellular systems . moreover , the phs ' s dynamic channel arithmetic and its advanced scheme are reasonedly discussed 文章介紹了信道分配方案的分類和評價信道分配的各種參數,分別分析了gsm 、 tdd - cdma 、 phs三個蜂窩系統的信道分配方案,其中對phs系統的動態信道分配方法及其改進方案進行了詳盡探討。

The dual effects of no were validated in this research . no was either oxidative or antioxidative which depends on the circumstances . generally no took part in the antioxidant cellular system by elevating the activities of cat and apx . while in the vd - toxin infected arabidopsis , no supressed the activity of cat and may participate in redox signaling during the activation of defense responses which follows the pathognen attack 本實驗結果進一步驗證了no作用的雙重性,即在通常情況下, no表現出的是抗氧化性,而當毒素與擬南芥互作時, no通過抑制cat活性,促進h _ 2o _ 2的積累,傳遞抗病信號,表現其氧化性的一面。

Firstly this paper researches present mobile communication technique of enhancing system capacity , next further researches basic principles of tdma and cdma system . based on these researches a new scheme is proposed that let broadband code division multiple access ( b - cdma ) system overlay on an existing narrowband digital cellular system ( i . e . gsm ) 本文首先研究了移動通信現有的擴容技術,其次深入研究了tdma系統和cdma系統的基本原理,在此基礎上提出了利用gsm與寬帶cdma系統同頻傳輸實現系統擴容的方案。

Dynamic assignment problem in a large cellular system can be formulated as an dynamic programming problem , by using java programming to simulate the rl arithmetic and fixed channel assignment , and comparing the blocking probability of them with the conditions of changing the cell configurations and parameters 把一個龐大蜂窩系統中的動態信道分配問題公式化為動態編程問題,采用java程序設計對動態信道分配的rl算法與固定信道分配算法進行仿真,在改變小區配置和不同參數設置的情況下比較了兩種信道分配方案的新建通話阻塞率。

Then the present capacity of gsm and cdma system is analyzed and the cellular system total capacity adopting this co - frequency transmission scheme will be discussed in detail . it can be estimated that such an overlay has the potential of enhancing the overall spectrum efficiency and system capacity and it can provid e for the flexibility of spectrum utilization . finally this scheme will be simulated and then we analyze the relationship between spread spectrum processing gain , system capacity and mutual interference according to simulation results 然后對現有的gsm系統和cdma系統的容量進行了分析,并對采用同頻傳輸方案的蜂窩系統容量進行了仔細的分析,通過計算得出用寬帶cdma系統與gsm系統進行頻帶共享,可以大大提高整個系統的容量,最后進一步對該方案進行了仿真,根據仿真得到的結果分析擴頻增益與系統容量和相互干擾之間的關系。

Rapl belongs to ras superfamily of small gtp - binding proteins , which is considered to control cell growth , differentiation and survival . rapl was regarded as an antagonist of ras because it can revert the phenotype of oncogene ras transformed cells . recent researches show that rapl has its ras - independent functions in a variety of cellular systems besides its effect as an antagonist of ras Rap1除具有逆轉原癌基因ras激活突變體所導致的細胞形態改變而被認為是ras的拮抗物外,最近的研究還發現rap1在一系列的細胞系統中有獨立于ras之外的功能,如控制與細胞粘附有關的事件等,因而成為研究的熱點。

Code division multiple access ( cdma ) has rapidly become a leading technology for commercial cellular systems because it has large capacity , good voice quality and big potential of upgrading etc . in 1996 , china began the commercial trial of cdma cellular communication network in four cities , beijing , shanghai , guangzhou and xi ' an 基于cdma (碼分多址)技術的數字蜂窩系統由于具有容量大、音質好、升級潛力大等優點,贏得了廣大消費者及運營商的青睞,在世界各地也得到了越來越廣泛的應用。 1996年,我國首先在北京、上海、廣州和西安四城市進行了cdma網的商用試驗。

Taking uplink as an example , both simplified analysis and intensive computer simulations are presented to offer comparisons among frn enhanced systems with the proposed schemes , with a known channel - borrowing based frequency planning scheme and the conventional cellular system without relaying 同時,相對于側重覆蓋面積的頻譜分配方案,側重于頻譜效率的頻譜分配方案的頻譜復用距離較小,從而有更高的頻譜利用率,其重點在于解決頻譜效率問題。

Chapter 3 investigates the capacity improvement in cdma multi - cellular system with base - station smart antenna . we consider the effects of multipath interference , thermal noise , path loss , processing gain and voice activity factor . and introduces multiuser detection combined with smart antenna 考慮了多徑干擾、熱噪聲、路徑損耗、處理增益和語音激活因子的影響;并介紹了與智能天線技術相結合的多用戶檢測技術。

The use of digital radio transmission and the advanced handover algorithms between radio cells in gsm networks allows for significantly better frequency usage than in analogue cellular systems , thus increasing the number of subscribers that can be served Gsm網絡使用數線傳輸和先進的無線越區切換算法,可以得到比模擬蜂窩系統好得多的頻率利用,因而增加了服務的用戶數。

Following the principle of reuse partitioning , two new frequency planning schemes are proposed , the coverage - oriented scheme and the efficiency - oriented scheme , for the cellular system with two - hop fixed relay nodes ( frns ) 摘要根據復用分割原則,提出2種新的兩跳固定中繼蜂窩網的頻譜分配方案,即:側重于覆蓋面積的頻譜分配方案和側重于頻譜效率的頻譜分配方案。

Power control is the key technology of cdma cellular system . in this paper , we present a power control algorithm based on partially compensating signal to interference ratio , and it can improve system capacity and system performance 功率控制是cdma蜂窩通信系統的關鍵技術.本文給出一種部分補償信干比的功率控制算法,可以提高系統的容量,改善系統性能

Chapter 2 introduces the theory of cellular system design , including several elements usually used in design . at the same time chapter 2 gives out the effects that these elements bring to the system performance 第二章介紹了蜂窩通信系統設計中的幾個基本要素,并重點介紹了每個要素對系統容量、服務質量等系統性能參數的影響及解決辦法。

With the rapid development of mobile communication systems , the existing gsm and narrowband cdma cellular system cannot solve the contradiction between the limited frequency source and the increased mobile users 隨著移動通信的飛速發展,現有的gsm系統和窄帶cdma系統已無法緩解頻率資源有限與移動用戶急速增加的尖銳矛盾。

A term used in the cellular phone business to allow the cellular system some way of choosing which calls to complete based on some sort of priority 蜂窩電話業務中使用的術語,為蜂窩系統在某種優先權的基礎上選擇并完成呼叫提供途徑。

Examples of communications technology platforms include cellular systems , wireless lans and wireless personal area networks 通訊技術平臺的例子包括流動通訊系統、無線局部區域網絡及無線個人區域網絡等。

Mobile station - base station compatibility standard for wideband spread spectrum cellular systems 寬帶擴頻蜂窩系統的移動站和基站兼容性標準