forward access channel 中文意思是什麼
forward access channel
解釋
前向接入通道-
An abstract model of secure subnet is put forward based on channel model of vpn and secure subnet model of enterprise in charpter three. and double - way authentication access control mechanism of secure subnet is analyzed in detail in charpte four
首先以「虛擬專用網路」 （ vpn ）隧道模型和企業級安全子網結構模型為基礎，提出安全子網的抽象模型，然後詳細討論了安全子網的雙向認證訪問控制機制。 -
The directional routing protocol ds _ dsr put forward by the author is the improvement of the current protocol dsr, complete routine discovery and maintenance by directional neighbor nodes routing table, source routing and directional steering. the research discovers the application of the directional antenna, compare the omnidirectional antenna can increases the networks " total throughput, obviously reduces the co _ channel interference ( cci ), multiple access interference ( mai ), enlarges the nodes " signal and interference to noise ratio ( sinr ), and because of the high gain of directional antenna can realize the communication with farther distance and less jump, end to end delay can decrease deeply, simultaneously, security of networks can be improved partially, the node energy also can be saved easily by power control
本文提出的定向路由協議ds _ dsr是基於對現有協議dsr的改進下實現的，通過定向鄰節點路由表、定向源路由和定向搜索來完成路由發現與維護。研究發現，定向天線的應用，相比全向天線可明顯提高網路的總的吞吐量，減少通道干擾、多址干擾，提高信干噪比，且由於定向天線的高增益可實現較遠距離、較少跳數的通信，減少了路由發現時間，這樣大大減小了傳輸時延，網路的整體性能得到了不同程度的提高，同時部分地解決安全問題，通過功率控制還可較容易的實現節能的目的。 -
Aiming at the wireless optical channel and operation characteristics, carrier sense multiple access / collision avoidance ( csma / ca ) mac protocol is put forward taking into account the bit error rate ( ber ). this paper studies the protocol theory, access mechanism detailedly, and models the throughput performance, simulates and analyzes the performance. the paper analyzes the performance influence factors such as ber, transmit probability, number of the terminals, initial windows, retry limit and so on
（ 2 ）針對無線光局域網的通道特性及業務特徵，在考慮通道誤碼率影響的基礎上，分析了基於載波監聽/沖突避免（ carriersensemultipleaccess / collisionavoidance ， csma / ca ）接入的無線光局域網mac協議，詳細闡述了協議原理和接入機制，用馬爾可夫模型對mac吞吐量性能進行了建模，並進行模擬計算和分析，詳細討論了在基本接入機制和rts / cts接入機制下，通道誤碼率、終端發送概率、終端數、初始化窗口、重傳極限等參數對吞吐量性能的影響，同時對兩種接入機制性能進行了比較分析。 -
3. we investigated the topology framework and the mac protocol in wireless optical cdma access network. the network throughput for slotted aloha - cdma protocol was derived and analyzed. aiming at the issue that network has low throughput at high offered payload, this thesis put forward modified channel load sensing protocol ( mclsp ), the proposed protocol was proved effective in improving network throughput
3 .研究了w - ocdma接入網的拓撲結構以及mac協議，將時隙aloha - cdma協議引入到w - ocdma接入網中，分析了單業務和多業務模型下協議的吞吐性能，模擬結果表明:輕負載時網路吞吐性能較好;重負載時網路吞吐性能惡化。
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