本文選題：S頻段　切入點：APSK調(diào)制　出處：《西安電子科技大學》2014年碩士論文　論文類型：學位論文

【摘要】：與地面移動/無線通信系統(tǒng)融合是未來衛(wèi)星移動通信系統(tǒng)發(fā)展的必然趨勢,兩者的融合是實現(xiàn)個人通信(即實現(xiàn)5W)發(fā)展的方式之一。目前,地面無線通信的主流傳輸技術(shù)是OFDM技術(shù),鑒于此,本文設計一個基于OFDM的衛(wèi)星移動通信系統(tǒng),該系統(tǒng)工作在S頻段。本文首先介紹了OFDM的基本原理,其次研究了適合衛(wèi)星通信系統(tǒng)的調(diào)制方式,再次設計了適合既定信道的信道估計及均衡算法,最后搭建了衛(wèi)星通信系統(tǒng)仿真平臺。本文主要研究內(nèi)容如下:1.介紹了OFDM的系統(tǒng)模型,每個模塊的工作原理及其作用,分析了該系統(tǒng)中的峰均比技術(shù),同步技術(shù),信道估計技術(shù)等三種關(guān)鍵技術(shù)。2.在非線性衛(wèi)星信道中,分析了非線性幅度失真,非線性相位失真對QAM,PSK,APSK三種調(diào)制方式信號的影響,對比了其信噪比與誤碼率的性能,得出APSK在非線性衛(wèi)星信道中有更好的誤碼性能。設計了兩種APSK的星座結(jié)構(gòu),并研究了其軟調(diào)制和軟解調(diào)算法。3.針對系統(tǒng)的信道模型研究并設計了適合該系統(tǒng)的信道估計和均衡算法,該算法是基于導頻的信道估計,在LS算法的基礎上進行了改進,改進后的算法相對傳統(tǒng)的LS算法,不僅能提高3d B的誤碼性能,還可以估計采樣相偏以及殘余頻偏。4.進行了系統(tǒng)總體方案的設計,包括OFDM幀結(jié)構(gòu)的設計及形成,收發(fā)信機和仿真信道的設計,并對仿真結(jié)果在比特率,頻譜效率和誤碼率等方面進行了分析。
[Abstract]:Integration with terrestrial mobile / wireless communication system is the inevitable trend of the future satellite mobile communication system. The fusion of the two systems is one of the ways to realize the development of personal communication (that is, to realize 5W). The mainstream transmission technology of terrestrial wireless communication is OFDM technology. In view of this, this paper designs a satellite mobile communication system based on OFDM, which works in S band. Firstly, the basic principle of OFDM is introduced. Secondly, the modulation mode suitable for satellite communication system is studied, and a channel estimation and equalization algorithm suitable for a given channel is designed again. Finally, the simulation platform of satellite communication system is built. The main contents of this paper are as follows: 1. The system model of OFDM, the working principle and function of each module are introduced, and the PAPR technology and synchronization technology are analyzed. In nonlinear satellite channel, the influence of nonlinear amplitude distortion and nonlinear phase distortion on the signal of QAM PSK / APSK modulation mode is analyzed, and the performances of SNR and bit error rate are compared, and the signal to noise ratio (SNR) and bit error rate (BER) of the signal to noise ratio (SNR) and bit error rate (BER) are compared. It is concluded that APSK has better error-code performance in nonlinear satellite channels. Two constellation structures of APSK are designed. And the soft modulation and soft demodulation algorithm. 3. Aiming at the channel model of the system, the channel estimation and equalization algorithm suitable for the system is studied and designed. The algorithm is based on pilot channel estimation, and is improved on the basis of LS algorithm. Compared with the traditional LS algorithm, the improved algorithm can not only improve the error performance of 3D B, but also estimate the sampling phase offset and residual frequency offset. 4. The overall scheme of the system is designed, including the design and formation of OFDM frame structure. The design of transceiver and simulation channel is given. The simulation results are analyzed in bit rate, spectrum efficiency and bit error rate.
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN929.53

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本文編號：1578556