DPSK调制解调及性能分析.doc

DPSK调制解调及性能分析DPSK调制解调及性能分析DPSK调制解调及性能分析摘要随着通信技术的日益迅速发展。数字通信很明显优越于模拟通信.但为了使数字基带通信能够在具有带通传输特性中传输,数字基带信号必需要进行调制,成为已调数字信号才能适应信道传输。其中基本的三种数字调制方式有:振幅键控（ASK），移频键控（FSK）和相移键控（PSK或DPSK）。其中相移键控是在三种基本数字调制方式中抗噪声性能最好,而且差分相频键控（DPSK）克服了PSK的相干载波恢复中载波相位模糊的缺点。对DPSK的研究分析有助于现代或者未来数字调制的发展。关键词:DPSK调制调频解调抗噪声性能SystemViewABSTRACTWiththeincreasinglyrapiddevelopmentofcommunicationtechnology。Digitalcommunicationsissignificantlysuperiortoanalogcommunication。However，inordertoenabledigitalcommunicationwithtransmissioncharacteristicsofbandpasstransmission，digitalbasebandsignalwillneedtobemodulated，themodulateddigitalsignalinordertoadaptthechanneltransmission。ThreeDigitalModulation:AmplitudeShiftKeying（ASK）,frequencyshiftkeying(FSK）andphaseshiftkeying(PSKorDPSK)。Whichthephase-shiftkeyingisthebestanti—noiseperformanceinthethreebasicdigitalmodulationscheme，differentialphasefrequencyshiftkeying(DPSK)toovercometheshortcomingsofPSKcoherentcarrierrecovery180degreesinthecarrierphaseambiguity.ThestudyofDPSKanalysistocontributetothedevelopmentofthemodernorthefutureofdigitalmodulation.Keywords:DPSKsystemdemodulationperformanceofresistancetonoiseSystemView目录TOC\o”1—3"\h\z\uHYPERLINK\l"_Toc324963749"第一章绪论PAGEREF_Toc324963749\h1HYPERLINK\l”_Toc324963750”第二章2DPSK调制解调系统原理PAGEREF_Toc324963750\h3HYPERLINK\l”_Toc324963751"2。1二进制相移键控(2PSK）的调制解调方法PAGEREF_Toc324963751\h3HYPERLINK\l"_Toc324963752"2.1.12PSK的调制原理PAGEREF_Toc324963752\h3HYPERLINK\l"_Toc324963753”2.1.22PSK的解调原理PAGEREF_Toc324963753\h4HYPERLINK\l”_Toc324963754”2。22DPSK调制与解调原理PAGEREF_Toc324963754\h5HYPERLINK\l”_Toc324963755"2.2。12DPSK调制原理PAGEREF_Toc324963755\h5HYPERLINK\l”_Toc324963756"2.2。22DPSK解调原理PAGEREF_Toc324963756\h6HYPERLINK\l”_Toc324963757"2。32DPSK系统性能理论分析PAGEREF_Toc324963757\h7HYPERLINK\l"_Toc324963758"2。3.12DPSK系统抗噪声性能PAGEREF_Toc324963758\h7HYPERLINK\l"_Toc324963759”2.3.22DPSK频带利用率PAGEREF_Toc324963759\h9HYPERLINK\l”_Toc324963760”2。3.32DPSK对信道特性变化的敏感性PAGEREF_Toc324963760\h10HYPER