【摘要】：物聯(lián)網(wǎng)繼互聯(lián)網(wǎng)之后,成為信息產(chǎn)業(yè)的又一次革命浪潮,其在智能家居、物流、醫(yī)療等領(lǐng)域的示范性應(yīng)用,推動著物聯(lián)網(wǎng)技術(shù)的快速發(fā)展。其中,適用于物聯(lián)網(wǎng)的無線通信技術(shù)越來越受到重視。不同的物聯(lián)網(wǎng)應(yīng)用場景需要不同的無線通信方式。為了實(shí)現(xiàn)萬物互聯(lián),適應(yīng)不同通信技術(shù)標(biāo)準(zhǔn)、支持多制式的調(diào)制解調(diào)平臺成為研究熱點(diǎn)。本文利用資源共享,基于FPGA將物聯(lián)網(wǎng)中廣泛采用的2FSK,BPSK和QPSK的調(diào)制解調(diào)系統(tǒng)集成到同一通用硬件平臺,滿足物聯(lián)網(wǎng)需求。首先,學(xué)習(xí)了三種模式的基本調(diào)制解調(diào)原理。針對解調(diào)部分,提出了一個統(tǒng)一的同步機(jī)制。傳統(tǒng)的Costas loop無法覆蓋所有的相位誤差,機(jī)制改進(jìn)了傳統(tǒng)Costas loop的鑒相結(jié)構(gòu),使其鑒相范圍能夠覆蓋從-90°至90°。同時,同步機(jī)制結(jié)合基于訓(xùn)練序列的相位旋轉(zhuǎn)法消除了系統(tǒng)的相位模糊。這種方法適用于各種模式的相干解調(diào),通用性較高。然后,在調(diào)制解調(diào)系統(tǒng)的硬件實(shí)現(xiàn)過程中,分析了各模塊的最佳設(shè)計方法。通過硬件共享將各模式的調(diào)制解調(diào)結(jié)構(gòu)統(tǒng)一,實(shí)現(xiàn)了一個可以即時轉(zhuǎn)換不同模式的全硬件平臺。系統(tǒng)開發(fā)平臺為Altera FPGA,型號為Stratix Ⅲ EP3SE50F484C2。實(shí)驗(yàn)時,基于FPGA分別實(shí)現(xiàn)了單一BPSK,2FSK和QPSK的硬件平臺,對比它們和通用平臺的硬件資源消耗情況,平均優(yōu)化達(dá)到56.09%。設(shè)計實(shí)現(xiàn)的操作頻率可達(dá)202.36MHz,基帶數(shù)據(jù)傳輸速率在4.8kbps至20Mbps內(nèi)可調(diào),滿足物聯(lián)網(wǎng)無線通信的需求。
[Abstract]:After the Internet of things, Internet of things has become another revolutionary tide of information industry. Its exemplary application in the fields of smart home, logistics, medical treatment and so on, promotes the rapid development of Internet of things technology. Among them, the wireless communication technology suitable for the Internet of things has been paid more and more attention. Different internet of things applications require different wireless communication methods. In order to interconnect everything, adapt to different communication technology standards and support multi-standard modulation and demodulation platform has become a research hotspot. In this paper, the widely used modulation and demodulation systems of 2FSKBPSK and QPSK in the Internet of things are integrated into the same common hardware platform based on FPGA to meet the needs of the Internet of things. First, the basic modulation and demodulation principles of three modes are studied. A unified synchronization mechanism is proposed for demodulation. The traditional Costas loop can not cover all the phase errors. The mechanism improves the phase detection structure of the traditional Costas loop so that it can cover the range from -90 擄to 90 擄. At the same time, the synchronization mechanism combined with the phase rotation method based on training sequence eliminates the phase ambiguity of the system. This method is suitable for coherent demodulation of various modes and has high generality. Then, in the hardware implementation of modulation and demodulation system, the optimal design method of each module is analyzed. Through hardware sharing, the modulation and demodulation structure of each mode is unified, and a hardware platform which can convert different modes in real time is realized. The system development platform is Altera FPGA, model Stratix 鈪，

本文編號：2286304