【摘要】：現(xiàn)代無線通信技術(shù)已經(jīng)從只傳輸語音、文字發(fā)展到提供多媒體業(yè)務(wù)以及互聯(lián)網(wǎng)接入服務(wù),這對(duì)通信系統(tǒng)的傳輸速率提出了更高的要求。因此,為了增大數(shù)據(jù)吞吐量,提高頻譜效率,現(xiàn)代的通信協(xié)議普遍采用復(fù)雜的非恒包絡(luò)調(diào)制方式。然而這些調(diào)制信號(hào)的高峰均比會(huì)嚴(yán)重減低功放的效率,因此需要引入線性化技術(shù)對(duì)功放的線性度進(jìn)行補(bǔ)償。前饋功放有著工作頻帶寬,線性度好等優(yōu)點(diǎn),因此普遍使用于現(xiàn)代通信系統(tǒng)。然而前饋功放為開環(huán)系統(tǒng),需要對(duì)環(huán)路的增益與相位進(jìn)行精確的調(diào)節(jié),以應(yīng)對(duì)溫度,器件老化等問題對(duì)系統(tǒng)性能的影響,因此需要自適應(yīng)控制系統(tǒng)動(dòng)態(tài)調(diào)節(jié)功放的參數(shù)。前饋功放的自適應(yīng)控制方案有多種,每種方案都有各自的優(yōu)缺點(diǎn),因此需要設(shè)計(jì)者根據(jù)實(shí)際的應(yīng)用環(huán)境與設(shè)計(jì)要求選擇合適的控制方案,并根據(jù)實(shí)際的硬件調(diào)試自適應(yīng)算法,以獲得最優(yōu)的線性化效果。本文主要討論了寬帶信號(hào)作為擴(kuò)頻信號(hào)的線性化方案的實(shí)現(xiàn),研究成果基于前人的基礎(chǔ),并做了進(jìn)一步的改進(jìn)。本文第一章主要介紹了課題的研究背景以及研究的必要性。第二章主要介紹了射頻功放的線性失真與非線性失真特性,并著重介紹了幾種常見的非線性失真,并引入了多個(gè)指標(biāo)衡量功放的非線性,如1dB壓縮點(diǎn)、3階截?cái)帱c(diǎn)、鄰信道功率比等。第三章簡要介紹了幾種常見的功放線性化技術(shù),包括功率回退、反饋、前饋、預(yù)失真等,并分析了每種方法的優(yōu)缺點(diǎn)。第四章介紹了自適應(yīng)前饋功放系統(tǒng)的設(shè)計(jì),包括直接檢測(cè)以及諸如導(dǎo)頻檢測(cè)兩種方案的具體實(shí)現(xiàn)方法。第五章介紹了前饋功放系統(tǒng)數(shù)字控制部分的設(shè)計(jì)與實(shí)現(xiàn)。第六章為實(shí)際系統(tǒng)的測(cè)試結(jié)果,并提出了未來改進(jìn)的方向。
[Abstract]:Modern wireless communication technology has developed from only transmitting voice and text to providing multimedia services and Internet access services, which puts forward higher requirements for the transmission rate of communication systems. Therefore, in order to increase data throughput and improve spectral efficiency, complex non-constant envelope modulation is widely used in modern communication protocols. However, the peak to average ratio of these modulated signals will seriously reduce the efficiency of the power amplifier, so it is necessary to introduce linearization technology to compensate the linearity of the amplifier. Feedforward amplifier is widely used in modern communication systems because of its advantages of bandwidth and linearity. However, the feedforward power amplifier is an open-loop system, so it is necessary to adjust the gain and phase of the loop precisely to deal with the effects of temperature and device aging on the performance of the system, so it is necessary to adjust the parameters of the power amplifier dynamically by adaptive control system. There are many adaptive control schemes for feedforward power amplifier, and each scheme has its own advantages and disadvantages. Therefore, it is necessary for the designer to choose the appropriate control scheme according to the actual application environment and design requirements, and to adjust the adaptive algorithm according to the actual hardware. In order to obtain the optimal linearization effect. This paper mainly discusses the realization of the linearization scheme of wideband signal as spread spectrum signal. The research results are based on the previous research results and further improvements are made. The first chapter mainly introduces the research background and the necessity of the research. In the second chapter, the linear and nonlinear distortion characteristics of RF power amplifier are introduced, and several common nonlinear distortions are emphasized. Several indexes are introduced to measure the nonlinearity of the amplifier, such as the third order truncation point of 1dB compression point. Adjacent channel power ratio etc. In chapter 3, several common linearization techniques are briefly introduced, including power back, feedback, feedforward, predistortion and so on, and the advantages and disadvantages of each method are analyzed. Chapter 4 introduces the design of adaptive feedforward power amplifier system, including direct detection and pilot detection. The fifth chapter introduces the design and implementation of the digital control part of the feedforward power amplifier system. The sixth chapter is the test results of the actual system, and proposes the direction of improvement in the future.
【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】：2014
【分類號(hào)】：TN92;TP273

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