fade characteristics中文什么意思

fade: vi. 1.褪色；失去光澤。 2.凋落，枯謝；衰老，憔悴。 3.漸淡，漸漸消失。 4.〔美俚〕離開，跑掉，逃掉。 The flowers have faded. 花已凋零。 All memory of his boyhood has faded from his mind. 他已經(jīng)記不清自己童年時(shí)代的情景。 vt. 使褪色；使凋謝；使衰老。 a carpet faded by the sun 被曬得褪了色的地毯。 fade in [out] 【電影】(使)漸現(xiàn)[隱]；【無(wú)線電】(使)(聲音)漸高[消]。 -r 音量[光量]調(diào)節(jié)器，混頻電位器。 fade2 adj. 1.乏味的，平淡的。 2.〔廢語(yǔ)〕萎謝褪色的，憔悴的。
fade for: 衰減耗時(shí)；衰減到
fade in: out; 漸強(qiáng)；淡入; 圖像漸顯
fade into: 隱沒(méi)在
fade-in: 【電影】漸現(xiàn)，淡入；【無(wú)線電】(聲音)漸高。fade-out 【電影】漸隱，淡出；【無(wú)線電】(聲音)漸消。

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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(tǒng)、深入地研究了水聲信道特性及其對(duì)水聲遠(yuǎn)程信息傳輸系統(tǒng)的影響；從聲納方程出發(fā)，確定了系統(tǒng)的最佳工作頻段；在聲傳播損失計(jì)算的基礎(chǔ)上，給出了聲源級(jí)的預(yù)報(bào)；基于時(shí)變信道理論，描述了遠(yuǎn)程水聲信道的衰落特性。
the simulation results based on siso and mimo systems show that the proposed scheme could effectively eliminate the time-variant fading characteristics of wireless channel and under an acceptable demand of ber, the frequency efficiency is enhanced greatly and besides, dynamic encoding is implemented with low complexity and high efficiency
通過(guò)在單天線和多天線系統(tǒng)中的仿真,表明該方案可以有效的克服無(wú)線信道的時(shí)變衰落特性,在滿足誤碼率性能要求的基礎(chǔ)上可以提高系統(tǒng)頻譜利用率,且實(shí)現(xiàn)復(fù)雜度低。

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