fading range 中文意思是什麼
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The propagation characteristics of underwater acoustic channels and their influences on long - range information transmission are studied thoroughly. based on the sonar equation, the optimal frequency band is abtained. from the calculation about transmission loss, the source level is forecasted. based on the random time varying channel theory, the fading characteristics of long - range underwater acoustic channels are analyzed
系統、深入地研究了水聲通道特性及其對水聲遠程信息傳輸系統的影響；從聲納方程出發，確定了系統的最佳工作頻段；在聲傳播損失計算的基礎上，給出了聲源級的預報；基於時變通道理論，描述了遠程水聲通道的衰落特性。 -
It has many benefits due to its ultra - wideband nature which including the following : not sensitive to channel fading, low transmit power, extremely difficult to intercept, low complexity of transceiver structure, fine range resolution ( centimeter scale ) for location and so on this paper combines uwb technology and mobile ad hoc network technology, concerting the lasn project of national key laboratory of communication, researchs the baseband process cell of uwb communication transceivers on the base of arithmetic research and spot test
本文結合uwb技術和移動自組織網（ manet ，即mobileadhocnetwork ）技術，配合通信抗干擾技術國防重點實驗室uwb技術研究項目「 lasnproject 」的工作進展，在演算法研究和現場測試的基礎上，對uwb通信節點樣機的基帶處理單元進行設計研究。樣機結構包含三大模塊:天線、用分立器件形成的射頻電路、由fpga構建的基帶處理單元。
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