本文關(guān)鍵詞：正交頻分復(fù)用系統(tǒng)峰均比抑制問題研究　出處：《西安電子科技大學(xué)》2014年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 正交頻分復(fù)用 峰均比 高功率放大器 壓擴(kuò)變換 載波注入 載波預(yù)留

【摘要】：正交頻分復(fù)用(OFDM)技術(shù)因其高頻譜效率、強(qiáng)抗多徑能力及低復(fù)雜度等諸多優(yōu)點(diǎn),被廣泛采納為多種無線通信系統(tǒng)的物理層標(biāo)準(zhǔn)。該技術(shù)的一個(gè)主要缺陷就是信號(hào)幅度具有較大的波動(dòng)范圍,即峰均比過大。當(dāng)信號(hào)峰值超過放大器線性工作范圍時(shí),會(huì)產(chǎn)生非線性失真,降低系統(tǒng)性能。為了提高系統(tǒng)性能,需要降低放大器的工作電平,將OFDM信號(hào)容納在放大器線性區(qū)范圍內(nèi),而這會(huì)嚴(yán)重降低功率放大器的功率效率。在無線通信網(wǎng)絡(luò)中,迫切需要減少能源消耗以降低系統(tǒng)運(yùn)營成本,這要求盡可能提高功率放大器的功率效率。因此,對OFDM系統(tǒng)來說,放大器功率效率和系統(tǒng)性能之間的矛盾就變得更為尖銳。本文從信號(hào)處理出發(fā),就如何有效降低OFDM信號(hào)峰均比以提升放大器功率效率進(jìn)行了研究,具體的研究工作和創(chuàng)新性成果如下:1.針對壓擴(kuò)變換處理在降低OFDM信號(hào)峰均比時(shí)會(huì)產(chǎn)生壓擴(kuò)失真,造成系統(tǒng)性能惡化的問題,以提升OFDM系統(tǒng)的誤碼率性能為出發(fā)點(diǎn),就壓擴(kuò)變換對OFDM信號(hào)造成的非線性影響進(jìn)行了數(shù)學(xué)推導(dǎo)和理論分析,提出了壓擴(kuò)函數(shù)的通用設(shè)計(jì)準(zhǔn)則。并基于提出的通用設(shè)計(jì)準(zhǔn)則提出了兩種失真最小化的壓擴(kuò)變換技術(shù):分段線性壓擴(kuò)技術(shù)和分段指數(shù)壓擴(kuò)技術(shù)。通過合理設(shè)計(jì)壓擴(kuò)參數(shù),分段線性壓擴(kuò)技術(shù)和分段指數(shù)壓擴(kuò)技術(shù)均能在有效抑制峰均比的同時(shí)減少壓擴(kuò)失真,提升系統(tǒng)誤碼率性能,獲得良好的誤碼率和峰均比抑制性能折中。此外,通過合理選擇壓擴(kuò)函數(shù)的分段點(diǎn),分段線性壓擴(kuò)技術(shù)和分段指數(shù)壓擴(kuò)技術(shù)均具有很高的設(shè)計(jì)靈活度,可以滿足更多的系統(tǒng)需求。2.針對理想載波注入技術(shù)復(fù)雜度過高的問題,提出了一種基于有序搜索的載波注入技術(shù)。該技術(shù)通過利用非線性失真頻域信號(hào)包含的信號(hào)調(diào)整信息,確定載波搜索順序,將理想載波注入技術(shù)中星座點(diǎn)-載波二維聯(lián)合搜索問題簡化為星座點(diǎn)/載波一維分步搜索問題,從而將載波注入技術(shù)的復(fù)雜度從隨載波數(shù)目指數(shù)增長變?yōu)殡S載波數(shù)目線性變化,大大降低了載波注入技術(shù)的復(fù)雜度。此外,該技術(shù)通過分析各等效星座點(diǎn)對峰均比抑制的作用,減小了等效星座點(diǎn)數(shù)目,在實(shí)現(xiàn)峰均比有效抑制的同時(shí)進(jìn)一步降低了該技術(shù)的復(fù)雜度。3.針對進(jìn)一步提高放大器功率效率,減少系統(tǒng)能耗的問題,提出了一種基于歸一化相關(guān)系數(shù)準(zhǔn)則的載波預(yù)留OFDM信號(hào)預(yù)處理技術(shù)。該技術(shù)從最大化接收端信噪比的角度出發(fā),利用放大器輸入輸出信號(hào)的歸一化相關(guān)系數(shù)來衡量放大器對OFDM信號(hào)的非線性影響。通過最大化該歸一化相關(guān)系數(shù),該技術(shù)可有效降低放大器非線性失真對OFDM信號(hào)的影響,進(jìn)而可以在提高放大器功率效率的同時(shí)提高系統(tǒng)性能。
[Abstract]:Orthogonal Frequency Division Multiplexing (OFDM) technology has many advantages, such as high spectral efficiency, strong anti-multipath ability and low complexity. It is widely adopted as the physical layer standard of many wireless communication systems. One of the main defects of this technology is that the signal amplitude has a large fluctuation range. When the peak value of the signal exceeds the linear range of the amplifier, it will produce nonlinear distortion and reduce the system performance. In order to improve the system performance, it is necessary to reduce the operating level of the amplifier. The OFDM signal is contained in the linear range of the amplifier, which will seriously reduce the power efficiency of the power amplifier. In wireless communication networks, there is an urgent need to reduce energy consumption in order to reduce the operating costs of the system. Therefore, for OFDM system, the contradiction between amplifier power efficiency and system performance becomes more sharp. This paper starts from signal processing. How to effectively reduce the PAPR of OFDM signal to improve the power efficiency of the amplifier is studied. The specific research work and innovative results are as follows: 1. Aiming at the problem of compression and spread distortion caused by the compression and spread transform processing when the PAPR of OFDM signal is reduced, the system performance will deteriorate. In order to improve the BER performance of OFDM system, the nonlinear effect of Companding transform on OFDM signal is derived and analyzed theoretically. In this paper, a general design criterion for the compression spread function is proposed, and based on the general design criterion, two techniques for minimizing distortion are proposed. Piecewise linear and piecewise exponential compression techniques. Both piecewise linear and piecewise exponential compression techniques can effectively reduce peak-to-average ratio (PAPR) and reduce spread distortion, improve the BER performance of the system, and achieve a good compromise between PAPR and PAPR suppression performance. By reasonably selecting the segmental points of the expansion function, the piecewise linear compression expansion technique and the piecewise exponential compression expansion technique have high design flexibility. It can meet more system requirements. 2. Aiming at the problem of high complexity of ideal carrier injection technology. In this paper, a carrier injection technique based on ordered search is proposed, which determines the sequence of carrier search by using the signal adjustment information contained in the nonlinear distortion frequency domain signal. The joint search problem of constellation point and carrier in ideal carrier injection technology is simplified to a constellation point / carrier one-dimensional step search problem. Thus, the complexity of carrier injection technology is changed from exponential increase with the number of carriers to linear change with the number of carriers, which greatly reduces the complexity of carrier injection technology. This technique reduces the number of equivalent constellation points by analyzing the effect of each equivalent constellation point to PAPR suppression. In order to improve the power efficiency of amplifier and reduce the energy consumption of the system, the complexity of this technique is further reduced while the PAPR is effectively suppressed. In this paper, a carrier reserved OFDM signal preprocessing technique based on normalized correlation coefficient criterion is proposed, which is based on maximizing the signal-to-noise ratio (SNR) of the receiver. The normalized correlation coefficient of the input and output signal of the amplifier is used to measure the nonlinear effect of the amplifier on the OFDM signal, and the normalized correlation coefficient is maximized. This technique can effectively reduce the influence of amplifier nonlinear distortion on OFDM signal, and then improve the power efficiency of amplifier at the same time improve the system performance.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN929.53

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 James L Siger;宋仲康;;改進(jìn)傳感器數(shù)據(jù)質(zhì)量的壓擴(kuò)電路[J];國外航天運(yùn)載與導(dǎo)彈技術(shù);1986年10期

2 魯昆生,傅耀明;準(zhǔn)瞬時(shí)壓擴(kuò)性能分析[J];華中工學(xué)院學(xué)報(bào);1987年04期

3 程震先,惲雪如;準(zhǔn)瞬時(shí)壓擴(kuò)技術(shù)的實(shí)現(xiàn)[J];北京理工大學(xué)學(xué)報(bào);1991年02期

4 楊露;;飛地壓擴(kuò)系統(tǒng)干擾案例分析與研究[J];中國無線電;2014年03期

5 袁夕君;張衛(wèi)民;劉軍;;壓擴(kuò)器在自動(dòng)增益控制電路中的應(yīng)用[J];電子元器件應(yīng)用;2003年11期

6 張琨;黎建波;劉春梅;彭景;;飛地壓擴(kuò)系統(tǒng)農(nóng)村應(yīng)用及工程造價(jià)對比分析[J];移動(dòng)通信;2013年20期

7 徐承亮;何文印;;壓擴(kuò)系統(tǒng)應(yīng)用[J];郵電設(shè)計(jì)技術(shù);2009年07期

8 王傳亮;呂衛(wèi)東;;疏堵并舉 規(guī)范管理——數(shù)字飛地壓擴(kuò)系統(tǒng)無線電監(jiān)管淺談[J];中國無線電;2014年03期

9 劉湘平;;單邊帶移動(dòng)無線電系統(tǒng)中振幅壓擴(kuò)的主觀性能[J];移動(dòng)通訊裝備;1985年04期

10 施馳，王宏遠(yuǎn);多頻編碼的短波線路壓擴(kuò)技術(shù)[J];電子學(xué)報(bào);1997年07期

相關(guān)會(huì)議論文 前5條

1 曲麗香;;自動(dòng)壓擴(kuò)器專利所有權(quán)價(jià)值評估分析[A];中國老教授協(xié)會(huì)土木建筑（含建筑物改造與病害處理）專業(yè)委員會(huì)全國第九屆建筑物改造與病害處理學(xué)術(shù)研討會(huì)論文集[C];2011年

2 吳慶國;;A-律μ-律壓擴(kuò)的DSP實(shí)現(xiàn)方法研究[A];江蘇省電子學(xué)會(huì)2010年學(xué)術(shù)年會(huì)論文集[C];2010年

3 李為;王欣;魏急波;;采用分段線性壓擴(kuò)法降低OFDM系統(tǒng)峰均比[A];第十屆中國科協(xié)年會(huì)論文集（三）[C];2008年

4 李為;王欣;魏急波;;采用分段線性壓擴(kuò)法降低OFDM系統(tǒng)峰均比[A];第十屆中國科協(xié)年會(huì)信息化與社會(huì)發(fā)展學(xué)術(shù)討論會(huì)分會(huì)場論文集[C];2008年

5 陸存樂;龔初光;王士林;;采用準(zhǔn)瞬時(shí)擴(kuò)壓的PCM編碼新技術(shù)[A];1985年全國微波會(huì)議論文集[C];1985年

相關(guān)重要報(bào)紙文章 前1條

1 記者 江一舟　通訊員 李煜文;河南卷煙打假保持高壓擴(kuò)戰(zhàn)果[N];東方煙草報(bào);2014年

相關(guān)博士學(xué)位論文 前2條

1 胡梅霞;正交頻分復(fù)用系統(tǒng)峰均比抑制問題研究[D];西安電子科技大學(xué);2014年

2 侯俊;正交頻分復(fù)用系統(tǒng)中降低峰均功率比的研究[D];西安電子科技大學(xué);2013年

相關(guān)碩士學(xué)位論文 前5條

1 劉川;正交頻分系統(tǒng)峰均功率比抑制技術(shù)研究[D];南昌航空大學(xué);2012年

2 秦強(qiáng);高速互聯(lián)總線關(guān)鍵技術(shù)研究和實(shí)現(xiàn)[D];西安電子科技大學(xué);2011年

3 楊超;聯(lián)合迭代濾波與壓擴(kuò)變換的OFDM信號(hào)峰平比抑制技術(shù)研究[D];西安電子科技大學(xué);2014年

4 劉康燕;OFDM系統(tǒng)中峰均比抑制技術(shù)的研究與FPGA實(shí)現(xiàn)[D];河北大學(xué);2013年

5 劉萍萍;OFDM系統(tǒng)中降低峰均比技術(shù)研究[D];西北大學(xué);2010年

，

本文編號(hào)：1438197