本文關(guān)鍵詞：基于濾波器組的多載波（FBMC）調(diào)制系統(tǒng)的研究及實(shí)現(xiàn)　出處：《電子科技大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 多載波調(diào)制 FBMC OQAM 導(dǎo)頻 FPGA

【摘要】：現(xiàn)代通信系統(tǒng)的核心單元是調(diào)制與解調(diào)系統(tǒng),在數(shù)字通信系統(tǒng)中即數(shù)字基帶調(diào)制解調(diào)技術(shù)。目前第四代移動(dòng)通信系統(tǒng)調(diào)制技術(shù)基于OFDM技術(shù)。OFDM調(diào)制系統(tǒng)擁有傳輸速率高,頻帶利用率高,抗摔落能力強(qiáng),抗碼間干擾()能力強(qiáng)等特點(diǎn)。但其矩形窗帶外衰落緩慢,在頻偏影響下子載波干擾明顯,循環(huán)前綴對(duì)頻譜效率的降低等問(wèn)題已逐漸成為其短板。隨著新一代移動(dòng)通信系統(tǒng)研發(fā)的迫近,急需新的調(diào)制系統(tǒng)以解決這些問(wèn)題。而濾波器組多載波(Filter Bank Multi-Carrier,FBMC)技術(shù)作為第五代移動(dòng)通信系統(tǒng)備選的調(diào)制方式,越來(lái)越受到人們重視。其優(yōu)勢(shì)在于對(duì)抗子載波干擾能力方面十分穩(wěn)定,能夠很好解決OFDM系統(tǒng)對(duì)子載波正交性要求及其苛刻的問(wèn)題;其不需要使用CP來(lái)對(duì)抗ISI,也使得其頻譜利用率顯著提高;其與交錯(cuò)正交幅度調(diào)制(Offset Quadrature Amplitude Modulation,OQAM)的結(jié)合使得其進(jìn)一步解決了相鄰子載波干擾的問(wèn)題。而本文就主要針對(duì)FBMC系統(tǒng)調(diào)制實(shí)現(xiàn)算法進(jìn)行分析實(shí)現(xiàn)。論文首先介紹了多載波系統(tǒng)的基本原理,并引申出OFDM調(diào)制和FBMC調(diào)制的具體原理并介紹了其各自的特性。在此基礎(chǔ)上,詳細(xì)介紹了FBMC調(diào)制的基本原理,以及原型濾波器特性的特性和設(shè)計(jì)要求以及其實(shí)現(xiàn)難點(diǎn)所在。FBMC系統(tǒng)的第一個(gè)實(shí)現(xiàn)難點(diǎn)在于其硬件實(shí)現(xiàn)性問(wèn)題,由于其調(diào)制方案較為復(fù)雜,計(jì)算量相對(duì)OFDM系統(tǒng)大幅增加,本后針對(duì)該問(wèn)題對(duì)系統(tǒng)具體實(shí)現(xiàn)結(jié)構(gòu)進(jìn)行了詳細(xì)研究,并提出了較為接近于當(dāng)前OFDM調(diào)制系統(tǒng)的計(jì)算量的硬件實(shí)現(xiàn)結(jié)構(gòu),即多相濾波結(jié)構(gòu)。FBMC系統(tǒng)實(shí)現(xiàn)的另一個(gè)實(shí)現(xiàn)難點(diǎn)在于其無(wú)法完全消除的相鄰子載波干擾的問(wèn)題,而針對(duì)該問(wèn)題,學(xué)界目前多以O(shè)QAM調(diào)制以避開相鄰子載波的干擾,本文在此基礎(chǔ)上針對(duì)FBMC系統(tǒng)的子載波干擾進(jìn)行了分析并詳細(xì)介紹了OQAM調(diào)制的相關(guān)原理和該技術(shù)與FBMC的結(jié)合優(yōu)勢(shì)。OQAM調(diào)制雖然解決了FBMC系統(tǒng)的子載波干擾的問(wèn)題,但卻給導(dǎo)頻算法和均衡器設(shè)計(jì)帶來(lái)極大的挑戰(zhàn),本文對(duì)導(dǎo)頻算法提出了兩種設(shè)計(jì)方案——輔助導(dǎo)頻法與相鄰載波置零法,其中前者需要額外的計(jì)算量和存儲(chǔ)資源以完成輔助導(dǎo)頻的計(jì)算,而后者則會(huì)消耗一定的頻譜資源,文中對(duì)兩種方案分別進(jìn)行了仿真實(shí)現(xiàn)與詳細(xì)分析。而均衡器設(shè)計(jì)由于與調(diào)制方案本身相關(guān)性并不直接,本文并未詳細(xì)討論。該文仿真實(shí)現(xiàn)并嚴(yán)格分析了FBMC系統(tǒng)性能,在抗噪聲、頻偏、定時(shí)偏移的能力方面與OFDM進(jìn)行了詳細(xì)比較,得到FBMC系統(tǒng)在對(duì)抗以上信道干擾時(shí)均全面優(yōu)于OFDM系統(tǒng)的結(jié)論,隨后還分析了FBMC系統(tǒng)的頻譜效率與計(jì)算復(fù)雜度等問(wèn)題并與OFDM系統(tǒng)進(jìn)行了定量對(duì)比。最后對(duì)針對(duì)分析得到的FBMC仿真系統(tǒng)結(jié)構(gòu)在Xilinx公司的K7系列芯片XC7K325T進(jìn)行了硬件實(shí)現(xiàn),給出了資源消耗情況與實(shí)現(xiàn)誤碼率分析。
[Abstract]:The core unit of modern communication system is modulation and demodulation system. At present, the modulation technology of 4th generation mobile communication system based on OFDM technology has high transmission rate and high frequency band utilization. It has the characteristics of strong anti-fall ability and strong anti-inter-symbol interference (ISI) ability. However, the rectangular window has slow fading outside the band, and the frequency offset affects the subcarrier interference obviously. With the development of the new generation of mobile communication systems, the problem of spectrum efficiency reduction of cyclic prefix has gradually become a short board. A new modulation system is urgently needed to solve these problems. But the filter bank multi-carrier filter Bank Multi-Carrier. As an alternative modulation method of the fifth generation mobile communication system, FBMC technology has been paid more and more attention. The advantage of FBMC is that it is very stable in the ability of counteracting subcarrier interference. It can solve the problem of subcarrier orthogonality and its harsh requirement in OFDM system. It does not need to use CP to fight against ISI, which also improves its spectrum efficiency significantly. It is offset Quadrature Amplitude Modulation with staggered quadrature amplitude modulation. OQAM). In this paper, the algorithm of modulation realization of FBMC system is analyzed and implemented. Firstly, the basic principle of multicarrier system is introduced. The specific principles of OFDM modulation and FBMC modulation are derived and their respective characteristics are introduced. On this basis, the basic principle of FBMC modulation is introduced in detail. The characteristics and design requirements of the prototype filter and its implementation difficulties. FBMC system is the first implementation difficulty lies in its hardware implementation problem, because its modulation scheme is more complex. Compared with the OFDM system, the calculation amount is greatly increased. After this paper, the specific implementation structure of the system is studied in detail. At the same time, the hardware implementation structure is proposed, which is close to the calculation of the current OFDM modulation system. That is to say, another difficulty in the realization of polyphase filter. FBMC system is that it can not completely eliminate the problem of adjacent sub-carrier interference, but aiming at this problem. At present, most scholars use OQAM modulation to avoid the interference of adjacent subcarriers. In this paper, the subcarrier interference of FBMC system is analyzed and the principle of OQAM modulation is introduced in detail. Subcarrier interference in BMC system. However, it brings great challenges to pilot algorithm and equalizer design. In this paper, we propose two design schemes for pilot algorithm: auxiliary pilot method and adjacent carrier zeroing method. The former requires additional computation and storage resources to complete the calculation of the auxiliary pilot, while the latter consumes a certain amount of spectrum resources. The two schemes are simulated and analyzed in detail, and the equalizer design is not directly related to the modulation scheme. This paper does not discuss in detail. This paper simulates and strictly analyzes the performance of FBMC system, and compares it with OFDM in the aspects of anti-noise, frequency offset and timing offset. It is concluded that the FBMC system is superior to the OFDM system in dealing with the above channel interference. Then the spectrum efficiency and computational complexity of FBMC system are analyzed and compared with OFDM system quantitatively. Finally, the structure of FBMC simulation system is analyzed in Xilinx. Division of the K7 series of chips XC7K325T hardware implementation. Resource consumption and error rate analysis are given.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TN929.5;TN713;TN911.3

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