調(diào)制解調(diào)技術(shù)中英文翻譯資料-wenkub.com
2024-08-30 17:34 本頁(yè)面
【正文】 因此，在移動(dòng)通信和互聯(lián)網(wǎng)上的應(yīng)用開(kāi)發(fā)也有很大的發(fā)展?jié)摿?。頻譜延伸至毫米波、亞毫米波的電磁“無(wú)線光纖”乃至激光與粒子通信范疇的無(wú)線通信將有愈來(lái)愈廣闊的活動(dòng)舞臺(tái)及光明的發(fā)展前景。在1986年前的國(guó)際會(huì)議上討論的數(shù)字調(diào)制技術(shù)幾乎都集中在上述的恒包絡(luò)調(diào)制技術(shù)，尤其是GMSK調(diào)制受到普遍的歡迎。FSK和PSK已在數(shù)字移動(dòng)通信中獲得應(yīng)用，其中FSK早已在模擬移動(dòng)通信的數(shù)字信令中得到采用。功率效率和頻譜效率一般不能兩全齊美。而作為移動(dòng)通信核心技術(shù)之一的數(shù)字調(diào)制技術(shù)是實(shí)現(xiàn)高速、高效的移動(dòng)通信系統(tǒng)的重要保證。s development. 譯文近幾年來(lái)，移動(dòng)通信中調(diào)制解調(diào)技術(shù)優(yōu)勢(shì)在發(fā)展速度和新應(yīng)用數(shù)目方面，給人非常深刻的印象。 Similarly, the high power efficiency also needs to sacrifice certain frequency spectrum with the modulation technique in the unceasing development, the new modulating technology modulating technique might bring the better frequency spectrum efficiency and the higher power efficiency. FSK and PSK in the numeral mobile munication the find application, in which FSK already obtained the use in the simulation mobile munication digital applies in the fixed pointtopoint digital microwave system widely, it has the very high frequency spectrum use the mobile munication environment regarding the traditional QAM modulation is the serious challenge, but in teaches in the character mobile munication system also to have uses Europe39。s numeral mobile munication to use is the GMSK modulation, but American and Japan39。隨著社會(huì)經(jīng)濟(jì)的發(fā)展，調(diào)制技術(shù)一直再更新和完善著，與此同時(shí)，移動(dòng)通信走過(guò)了第一代移動(dòng)通信、第二代移動(dòng)通信并即將進(jìn)入第三代移動(dòng)通信。數(shù)字調(diào)制解調(diào)技術(shù)在數(shù)字通信中占有非常重要的地位，常用的數(shù)字調(diào)制有：移頻鍵控（FSK）和移相鍵控（PSK）等。高的頻譜效率要以犧牲一定的功率效率來(lái)獲得。QAM在固定的點(diǎn)對(duì)點(diǎn)數(shù)字微波系統(tǒng)中應(yīng)用
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