【正文】 high frequency spectrum efficiency needs to sacrifice certain power efficiency to obtain。 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。s numeral mobile munication uses the QPSK modulating technology modulating digital modulating technology modulating technique discussed which in 1986 ago international conference nearly all concentrated in the above permanent enveloping modulating technology modulating technique, the GMSK modulation received universal wele in recent years as a result of the amplifier design technology progress, realized the modulation method possibly to 1987 the intermediate stage, linear modulation technologies and so on QPSK only then started to be popular.The review mobile munication development course, the modulation demodulation technology and the persontoperson munication mobility as well as the nonslit will cover the multimedia synthesis service demand increasingly to be frequency spectrum will extend to the millimeter wave, the submillimeter wave electromagnetism “the wireless optical fiber” and even the laser and the granule correspondence category wireless correspondence has the increasingly broad active stage and the bright prospects for market is the development driving our country39。s mobile munication and the Internet development is extremely rapid, but our country at present mobile phone and the network user popular rate very are also low, facing our country 1,300,000,000 populations, our country has the very big development space in the network scale and the capacity the same time, the petition aspect formation, urges the operation enterprise to develop the new service, the new application positively, provides the rich choice to the user, satisfies the user variously, the multilevel , also has the very big development potential on the mobile munication and the Internet application must promote the wireless domain advance in technology, the technological innovation positively, for the realization rely on science and education to rejuvenate the nation strategy, strengthens the Chinese nation the prehensive national strength, contributes the strength positively for the global informationization and under the economical globalization environment international society and universe39。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。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。在此之間，調(diào)制技術(shù)的發(fā)展在里面起著非常重要的作用。近年來(lái)，我們移動(dòng)通信業(yè)務(wù)迅猛發(fā)展，已深入到社會(huì)生活的各個(gè)方面，面對(duì)移動(dòng)用戶(hù)群的持續(xù)增長(zhǎng)和新業(yè)務(wù)的層出不窮，移動(dòng)通信體系要及時(shí)適應(yīng)甚至超前于市場(chǎng)需求的步伐。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。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。目前已用于移動(dòng)通信系統(tǒng)的調(diào)制技術(shù)可分為兩大類(lèi):線(xiàn)性調(diào)制技術(shù)和恒包絡(luò)調(diào)制技術(shù)線(xiàn)性調(diào)制技術(shù)主要有: PSKBPSK、QPSK、OQPSK/ 4QPSK QAM 16QAM 64QAM 256QAM，恒包絡(luò)調(diào)制技術(shù)主要有:MSK TFM GMSK。文章針對(duì)三種基本調(diào)制解調(diào)技術(shù)及其改進(jìn)調(diào)制技術(shù)進(jìn)行了詳細(xì)的仿真和分析，可見(jiàn)，選擇一種調(diào)制技術(shù)是根據(jù)信道特性和應(yīng)用來(lái)確定的。功率效率和頻譜效率一般不能兩全齊美。高的頻譜效率要以犧牲一定的功率效率來(lái)獲得。同樣，高的功率效率也要犧牲一定的頻譜效率。隨著調(diào)制技在不斷的發(fā)展，新的調(diào)制技術(shù)將可以帶來(lái)更好的頻譜效率和更高的功率效率。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。QAM在固定的點(diǎn)對(duì)點(diǎn)數(shù)字微波系統(tǒng)中應(yīng)用較廣泛，它具有很高的頻譜利用率。但是移動(dòng)通信的環(huán)境對(duì)于傳統(tǒng)的QAM調(diào)制是嚴(yán)重的挑戰(zhàn)，不過(guò)在教字移動(dòng)通信系統(tǒng)中也有使用QAM的。泛歐的數(shù)字移動(dòng)通信采用的是GMSK調(diào)制，而美國(guó)和日本的數(shù)字移動(dòng)通信則采用QPSK調(diào)制技術(shù)。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。近年來(lái)由于放大器設(shè)計(jì)技術(shù)的進(jìn)展，實(shí)現(xiàn)了調(diào)制方法成為可能。1987年中期，QPSK等線(xiàn)性調(diào)制技術(shù)才開(kāi)始流行起來(lái)?；仡櫼苿?dòng)通信的發(fā)展歷程，調(diào)制解調(diào)技術(shù)和個(gè)人通信的移動(dòng)性以及無(wú)縫隙覆蓋多媒體綜合業(yè)務(wù)需求將愈來(lái)愈突出。頻譜延伸至毫米波、亞毫米波的電磁“無(wú)線(xiàn)光纖”乃至激光與粒子通信范疇的無(wú)線(xiàn)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。市場(chǎng)是發(fā)展的驅(qū)動(dòng)力。盡管我國(guó)的移動(dòng)通信和互聯(lián)網(wǎng)發(fā)展十分迅速，但我國(guó)目前的移動(dòng)電話(huà)和網(wǎng)絡(luò)用戶(hù)普及率還很低，面對(duì)我國(guó)13億人口，我國(guó)在網(wǎng)絡(luò)規(guī)模和容量方面有很大的發(fā)展空間。同時(shí)，競(jìng)爭(zhēng)局面的形成，促使運(yùn)營(yíng)企業(yè)積極拓展新業(yè)務(wù)、新應(yīng)用，向用戶(hù)提供豐富的選擇，以滿(mǎn)足用戶(hù)多方面、多層次的需求。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ΑＮ覀円e極促進(jìn)無(wú)線(xiàn)領(lǐng)域的科技進(jìn)步、技術(shù)創(chuàng)新，為實(shí)現(xiàn)科教興國(guó)戰(zhàn)略，增強(qiáng)中華民族的綜合國(guó)力，為全球信息化及經(jīng)濟(jì)全球化環(huán)境下的國(guó)際社會(huì)與全人類(lèi)的發(fā)展而積極貢獻(xiàn)力量。5 結(jié)束語(yǔ)數(shù)字調(diào)制技術(shù)的發(fā)展日新月異，如今在現(xiàn)實(shí)中應(yīng)用的數(shù)字調(diào)制系統(tǒng)大部分是經(jīng)過(guò)改進(jìn)的，性能較好的系統(tǒng)，但是，作為理論發(fā)展最成熟的調(diào)制方式，ASK，F(xiàn)SK，PSK等的研究仍然具有很重大的意義，因此，我們選擇了這幾種調(diào)制方式做仿真研究。仿真這幾種理論已經(jīng)很成熟的數(shù)字調(diào)制方式，一方面，可以更容易將仿真結(jié)果與成熟的理論進(jìn)行比較，從而驗(yàn)證仿真的合理性；另一方面，也可以以此為基礎(chǔ)將仿真系統(tǒng)進(jìn)行改進(jìn)擴(kuò)展，使其成為仿真更多的數(shù)字調(diào)制方式的模板。另外，數(shù)字調(diào)制系統(tǒng)只是通信系統(tǒng)的一個(gè)重要組成部分，因此，我們所設(shè)計(jì)的數(shù)字調(diào)制仿真系統(tǒng)也可以擴(kuò)展成通信系統(tǒng)的仿真。這種擴(kuò)展只需在輸入端與調(diào)制器間增加一些數(shù)字基帶處理模塊，如信源編碼、加密、信道編碼等，在解調(diào)后增加相應(yīng)的解碼解密器即可。這套數(shù)字調(diào)制仿真系統(tǒng)使通信原理課程變得生動(dòng)易懂。本系統(tǒng)可以編譯成可執(zhí)行文件，脫離Matlab環(huán)境運(yùn)行，這樣該仿真系統(tǒng)的應(yīng)用將更加廣泛。由于時(shí)間的緣故，本人沒(méi)有在這一方面繼續(xù)做下去，后續(xù)者可繼續(xù)探討。致 謝參考文獻(xiàn)[1] （第五版）..[2] ...[3] .[4] .[5] [6] .[7] ，（1）.43~47.[8] (21).118~120.[9] ..普羅克斯，. 現(xiàn)在通信系統(tǒng)——使用MATLAB. 西安交通大學(xué)出版社，2001.附錄附錄[1] 判決模塊S函數(shù)的m文件：function [sys,x0,str,ts] = sfuntmpl(t,x,u,flag)switch flag, case 0, [sys,x0,str,ts]=mdlInitializeSizes。 case 3, sys=mdlOutputs(t,x,u)。 case{1,2,4, 9}, sys=[]。 otherwise error([39。Unhandled flag = 39。,num2str(flag)])。endfunction [sys,x0,str,ts]=mdlInitializeSizessizes = simsizes。 = 0。 = 1。 =1。 = 1。 = 1。 = 1。 sys = simsizes(sizes)。x0 = [0]。str = []。ts = [0 0]。function sys=mdlOutputs(t,x,u)if u=。 sys=1。elseif u=。 sys=0。end附錄[2] 各仿真模型性能比較程序x=1:11。dpkk % 打開(kāi)模型for i=1:11 A=x(i)+26。 set_param(39。DPKK/AWGN Channel39。,39。EsNodB39。,num2str(A))。%給信道置數(shù) sim(39。DPKK39。)。 %運(yùn)行模型 y4(i)=ErrorVec(1)。endsave_system(39。DPKK39。)。close_system(39。DPKK39。)。 %關(guān)閉模型FKKfor i=1:11 A=x(i)。 set_param(39。FKK/AWGN Channel39。,39。SNRdB39。,num2str(A))。 sim(39。FKK39。)。 y5(i)=ErrorVec(1)。endsave_system(39。FKK39。)。close_