wideband cdma 中文意思是什麼
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A policy of call admission control in wideband ds - cdma system
寬帶直擴碼分多址系統中的一種呼叫允許控制策略 -
Abstract : in this paper, an orthogonal multicode wideband cdma system modelincluding pilot channel based on chaos spreading sequences is given. based on chaos sequences, with pilot channel inserted orthogonally, it is shown that the performance of the system is improved. the performance of the system in fading channel is analyzed
文摘:提出一種基於混沌序列含導頻信號的寬帶正交多碼cdma系統模型，利用混沌序列以及採用正交插入導頻信號提高系統性能，並對此模型在衰落通道中的性能進行分析。 -
With the downlink simulation model constructed, performance of wideband cdma under different radio propagation environment and vehicular speed is simulated. based on system model of mc ds cdma under flat fading channel with relative shifts of spreading sequences within 1 chip and frequency selective fading channel with arbitrary relative chip shifts, performance of multicarrier cdma system with go sequences under different radio environment is investigated
基於多載波直接序列碼分多址在乎坦衰落通道中序列偏移小於1個碼片及在頻率選擇性衰落通道中偏移任意個碼片的系統模型，本文還分析了採用廣義正交序列的多載波碼分多址系統在不同無線傳播環境下的性能。 -
In this dissertation, we investigate in depth the optimal allocation of the various system resources including subchannel, power and transmission rate. first, a multicarrier ds - cdma system model for wideband access is proposed, according to the characteristic of wireless channels, the subchannel allocation is investigated in forward links of the multicarrier ds - cdma system
本文對主要的系統資源，即通道、功率和傳輸速率的分配優化問題進行了深入的研究，主要包括：首先，在分析無線通道傳輸特性的基礎上，提出了一種基於多載波ds - cdma的支持寬帶多業務接入的系統模型。 -
Smartone became the first in greater china by conducting the novel wideband cdma field trial in hong kong in may 1999. four months later, the company initiated the introduction of the world s first wap service to hong kong customers. in july 2000, smartone pilot launched hong kong s first gprs to corporate customers
一九九九年五月，數碼通在本港進行大中華區首項寬頻cdma第三代流動通訊實地技術測試同年九月，數碼通再拔頭籌，為香港用戶推出全球首項無線應用協定wap服務。 -
Chapter 2 describes the characteristics of wireless channel, presents vector channel model for wideband cdma systems, and emphasizes on the characteristics of indoor wireless channel
第二章描述了無線通道的特點，給出了寬帶cdma系統的矢量通道模型，並著重分析了室內無線通道的特徵。 -
The closed - form performance formulae of cck modulation are derived under awgn channel and rayleigh fading channel, whose validity is proved by simulations. multi - carrier wideband cdma architecture based on complete complementary codes spread ( ccc - cdma ) has high spectrum efficiency without mai theoretically, which meets the general requirements of b3g communications
研究了高速無線局域網ieee802 . 11b中的基帶技術，特別是基於互補碼擴頻的cck調制，推導出其在高斯噪聲通道和在多徑衰落通道條件下的性能公式。 -
Future mobile communication will be wide - band multimedia communication. the adoptive technologies include wideband cdma, software radio, intelligent antennas, ofdm ( orthogonal frequency division multiplexing ) and digital processing device. ofdm and software radio are both the charming technology for future mobile communication
移動通信的發展趨勢是寬帶多媒體通信，所採用的技術包括寬帶cdma 、軟體無線電（ softwareradio ） 、智能天線（ intelligentantennas ） 、正交頻分復用（ ofdm ）和數字處理設備。
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