本文選題：功率放大器 + 非線性失真　； 參考：《電子科技大學(xué)》2015年碩士論文

【摘要】：無(wú)線通信新技術(shù)的應(yīng)用提高了頻譜利用率,但也增大了傳輸信號(hào)的峰均功率比,當(dāng)不采用功率回退方法降低射頻功率放大器的效率時(shí),具有高峰均功率比的寬帶信號(hào)通過(guò)功放時(shí)更易產(chǎn)生非線性失真。效率與線性化程度的內(nèi)在矛盾為功放線性化技術(shù)提出了新的挑戰(zhàn),其中,數(shù)字預(yù)失真技術(shù)由于兼顧功放的效率與線性度,并具有簡(jiǎn)單、靈活及自適應(yīng)等特點(diǎn),成為一種最有潛力的功放線性化方法。本文對(duì)數(shù)字預(yù)失真關(guān)鍵技術(shù)進(jìn)行分析,并根據(jù)通信行業(yè)標(biāo)準(zhǔn)對(duì)數(shù)字基帶預(yù)失真鏈路進(jìn)行設(shè)計(jì),在已有文獻(xiàn)的基礎(chǔ)上對(duì)預(yù)失真算法進(jìn)行優(yōu)化改進(jìn),降低了功放的非線性失真程度。論文的主要貢獻(xiàn)包括:第一,對(duì)數(shù)字預(yù)失真鏈路進(jìn)行需求分析與總體方案的制定,在此基礎(chǔ)上完成鏈路的設(shè)計(jì)與驗(yàn)證,并對(duì)鏈路的影響因素:鏈路延時(shí)估計(jì)與補(bǔ)償、幅度增益調(diào)整等問(wèn)題進(jìn)行討論。第二,針對(duì)現(xiàn)有的查找表預(yù)失真算法精度低、空間需求較多等缺點(diǎn),提出了一種新的查找表預(yù)失真算法,并詳細(xì)描述了該算法的預(yù)調(diào)整值獲取策略及查找表資源分配策略。當(dāng)?shù)螖?shù)為1次,查找表大小為30時(shí),對(duì)基帶數(shù)字功放進(jìn)行預(yù)失真后得到仿真結(jié)果:第一鄰道功率比、誤差矢量幅度、歸一化均方誤差分別為79.04dBc/73.17dBc、0.0002%、-113.4549dB。第三,基于已設(shè)計(jì)的數(shù)字預(yù)失真鏈路對(duì)預(yù)失真算法性能進(jìn)行驗(yàn)證,并借助輸入輸出特性曲線、功率譜及非線性失真指標(biāo)等進(jìn)行分析,仿真結(jié)果表明改進(jìn)后的算法可以有效地改善功放的非線性失真程度,當(dāng)?shù)螖?shù)為1次,查找表大小為30時(shí),對(duì)功放非線性系統(tǒng)進(jìn)行預(yù)失真處理后得到仿真結(jié)果:第一鄰道功率比、誤差矢量幅度、歸一化均方誤差分別為62.94dBc/63.55dBc、0.1367%、-57.2709d B。
[Abstract]:The application of the new wireless communication technology improves the spectrum efficiency, but also increases the peak-to-average power ratio of the transmitted signal. When the power back method is not used to reduce the efficiency of the RF power amplifier, Wideband signals with peak to average power ratio are more prone to nonlinear distortion when they pass power amplifier. The inherent contradiction between efficiency and linearization presents a new challenge to the linearization technology of power amplifier. Among them, digital predistortion technology has the characteristics of simplicity, flexibility and self-adaptation due to the consideration of the efficiency and linearity of power amplifier. Become one of the most potential power amplifier linearization methods. In this paper, the key technology of digital predistortion is analyzed, and the digital baseband predistortion link is designed according to the communication industry standard. Based on the existing literature, the predistortion algorithm is optimized and improved to reduce the nonlinear distortion degree of power amplifier. The main contributions of this paper are as follows: first, the requirement analysis and overall scheme formulation of the digital predistortion link are carried out, and the link design and verification are completed on this basis, and the influencing factors of the link are estimated and compensated for the link delay. Amplitude gain adjustment and other issues are discussed. Secondly, aiming at the shortcomings of the existing look-up table predistortion algorithms, such as low precision and more space requirements, a new look-up table predistortion algorithm is proposed, and its pre-adjusted value acquisition strategy and lookup table resource allocation strategy are described in detail. When the number of iterations is 1 and the size of the lookup table is 30, the simulation results are obtained after pre-distortion of the baseband digital power amplifier: the first neighbor power ratio, the amplitude of the error vector, the normalized mean square error are 79.04 dBc / 73.17dBc / 0.0002 / -113.4549dBrespectively. Thirdly, based on the designed digital predistortion link, the performance of the predistortion algorithm is verified, and the input and output characteristic curve, power spectrum and nonlinear distortion index are analyzed. The simulation results show that the improved algorithm can effectively improve the nonlinear distortion of power amplifier. When the iteration number is 1, the lookup table size is 30. The simulation results are as follows: the first adjacent channel power ratio, error vector amplitude and normalized mean square error are 62.94 dBc / 63.55dBcn 0.1367db-1 -57.2709dB.The simulation results are as follows: the first channel power ratio, the error vector amplitude and the normalized mean square error are 62.94 dBc / 63.55dBcn 0.1367db.
【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】：2015
【分類(lèi)號(hào)】：TN722.75

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