本文選題：正交頻分復用 + 現(xiàn)場可編程門陣列��； 參考：《南京航空航天大學》2014年碩士論文

【摘要】：正交頻分復用(Orthogonal Frequency Division Multiplexing,OFDM)調(diào)制技術具有較高的頻譜利用率,能夠?qū)剐诺蓝鄰揭鸬念l率選擇性衰落,已成為第四代移動通信、無線局域網(wǎng)(Wireless Local Area Network,WLAN)等標準的物理層核心技術�，F(xiàn)場可編程門陣列(Field Programmable Gate Array,FPGA)具有豐富的邏輯運算單元、大量的知識產(chǎn)權核以及在線重構能力,在通信系統(tǒng)實現(xiàn),尤其是原型驗證過程中得到廣泛應用。采用FPGA等可編程邏輯器件,應用軟件無線電(Software Defined Radio,SDR)思想實現(xiàn)通信系統(tǒng)的可重構,提高系統(tǒng)靈活性和適應性,已成為未來通信系統(tǒng)的發(fā)展方向之一。本文參考IEEE 802.11a WLAN標準,設計并實現(xiàn)了基于FPGA的OFDM基帶調(diào)制系統(tǒng),主要內(nèi)容包括以下方面。第一,編碼技術的研究與FPGA實現(xiàn),實現(xiàn)了OFDM基帶調(diào)制系統(tǒng)的加擾和解擾、卷積編碼和Viterbi譯碼、交織和解交織。第二,分析了常用數(shù)字調(diào)制方式性能,實現(xiàn)了16QAM調(diào)制解調(diào)。第三,實現(xiàn)了基于快速傅里葉變換(Fast Fourier Transform,FFT)的OFDM調(diào)制,包括導頻插入、OFDM調(diào)制解調(diào)、加循環(huán)前綴。第四,分析并實現(xiàn)了基于循環(huán)前綴(Cyclic Prefix,,CP)的最大似然符號同步算法和基于偽隨機噪聲(Pseudo-Noise,PN)前導碼的符號同步算法,并證明在高斯白噪聲信道下,基于PN的算法要明顯優(yōu)于基于CP的算法。本文的基帶調(diào)制系統(tǒng)采用Verilog HDL語言在QuartusⅡ環(huán)境下開發(fā)。
[Abstract]:Orthogonal Frequency Division Multiplexing (OFDM) modulation technology has high spectral efficiency and can resist the frequency-selective fading caused by channel multipath. It has become the core technology of physical layer in the fourth generation mobile communication, wireless local Area network (WLAN) and so on. The Field Programmable Gate Array (FPGA) is widely used in communication systems, especially in the process of prototype verification, because of its rich logic operation unit, large intellectual property core and on-line reconfiguration capability. Using FPGA and other programmable logic devices, applying the idea of Software defined Radio (SDR) to realize the reconfiguration of the communication system and improving the flexibility and adaptability of the communication system has become one of the developing directions of the communication system in the future. Referring to the IEEE 802.11a WLAN standard, this paper designs and implements an OFDM baseband modulation system based on FPGA. The main contents include the following aspects. First, the research of coding technology and FPGA implementation, the realization of OFDM baseband modulation system scrambling and descrambling, convolution coding and Viterbi decoding, interleaving and de-interleaving. Secondly, the performance of common digital modulation mode is analyzed, and 16 QAM modulation and demodulation is realized. Thirdly, OFDM modulation based on Fast Fourier transform (FFT) is realized, including pilot insertion OFDM modulation and demodulation with cyclic prefix. Fourthly, the maximum likelihood symbol synchronization algorithm based on cyclic prefix (CP) and the symbol synchronization algorithm based on pseudo-random noise (PN) preamble code are analyzed and implemented, and it is proved that in the Gao Si white noise channel. The PN-based algorithm is obviously superior to the CP-based algorithm. In this paper, the baseband modulation system is developed with Verilog HDL language in Quartus 鈪，

本文編號：2051943