group modulation 中文意思是什麼

group modulation 解釋
群調制
  • group : n 1 群；批，簇。2 集團，團體，小組。3 【化學】基，團，組；（周期表的）屬，族。4 （雕塑等的）群像...
  • modulation : n 調整，調節；（聲調的）抑揚，變化；【音樂】轉調，變調；【無線電】調制。 amplitude modulation 振...
  1. There has been a revolutionary advance in ultrashort pulse technology since the discovery of self - mode locking of ti : sapphire lasers. few - femtosecond pulses have already been generated from ti : sapphire lasers, by means of combining self - phase modulation with negative group velocity dispersion, which is similar to the way of soliton generation

    鈦寶石激光自鎖模的發現使得超短脈沖技術發生了革命性的變化，利用自相位調制和負群速度色散結合的類孤子產生方式，人們已經在鈦寶石鎖模激光器上得到了脈寬只有幾個飛秒的光脈沖。
  2. The origin of supercontinuum ( sc ) generation in optical fibers has been conjectured to be the interplay between fiber nonlinearities ( self phase modulation, cross phase modulation and raman self scattering ) and group - velocity dispersion ( gvd )

    光纖中超連續supercontinuum （ sc ）譜的產生源於光纖中各種非線性效應（自相位調制效應、交叉相位調制效應，四波混頻效應及受激raman散射等）和群速度色散的共同作用。
  3. We derive an analytic expression of the group velocity dispersion ( gvd ) induced chirp and the self - phase modulation ( spm ) induced chirp in the normal dispersionregion of non - kerr - like optical fibers with saturable nonlinarity. the evolution of chirp is simulated by numerical methods. the studied results show that the more powerful saturable effects, the smaller is chirp and the gently is chirp. the net chirp is zero in the central region of the pulse

    從理論上推導出具有飽和非線性的非克爾光纖正常色散區內，群速度色散效應導致的啁啾和自相位調制效應導致的啁啾解析表達式.利用數值解法模擬了非克爾光纖正常色散區啁啾演變過程.研究結果表明：當非克爾光纖的飽和非線性增強時，凈啁啾不斷減小，而且，越來越平緩，脈沖中心附近區域凈啁啾接近零
  4. The origin of supercontinuum spectrum ( sc ) generation in optical fibers has been shown to be the interplay between fiber nonlinear effects ( such as self phase modulation, cross phase modulation, stimulated raman scattering and stimulated brillouin scattering etc ) and group - velocity dispersion ( gvd )

    光纖中超連續譜supercontinuumspectrum （ sc ）的產生源於光纖中各種非線性效應（如自相位調制效應、交叉相位調制效應，四波混頻效應、受激raman散射與受激brillouin散射等）和群速度色散共同作用。
  5. In july 1998, the ieee standardization group selected the ofdm modulation technique for their new ieee802. 1 la standard, targeting data transmission from 6 up to 54 mbps. meanwhile, this new ieee standard is the first one to use ofdm in packet based communications

    同時該標準是第一個將ofdm技術應用於包傳輸通信中的ieee標準（在該標準提出以前， ofdm通常局限使用於連續傳輸系統中，如： dvb ， hdtv ） 。
  6. In july 1998, the ieee standardization group selected the ofdm modulation technique for their new ieee802. 1l a standard, targeting data transmission from 11 up to 54 mbps. meanwhile, this new ieee standard is the first one to use ofdm in packet based communications. ( before the proposal of this standard, use of ofdm was limited to continuous systems ) in this paper, the author firstly presents the technical characteristics and the typical application of wireless local area network ( wlan ), analyzes its topology structure, the network configuration and etc. then the author illustrates the media access control and the operation and frame structure of physical layer

    1998年7月， ofdm技術正式被ieee標準組確定為ieee802 . 11a物理層調制方法，使得無線局域網數據傳輸速率由11mbps提高到54mbps ，性能得到明顯改善。同時該標準是第一個將ofdm技術應用於包傳輸通信中的ieee標準（在該標準提出以前， ofdm的使用通常局限於連續傳輸系統中） 。本文中，作者首先介紹了無線局域網的技術特點和典型應用，分析了其拓撲結構、網路配置功能等。
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