【摘要】：在今天這個互聯(lián)網(wǎng)時代,無線通信蓬勃發(fā)展,尤其是移動通信,這就促使頻譜變成了一種寶貴而短缺的資源。正交頻分復(fù)用技術(shù)(Orthogonal Frequency Division Multiplexing,OFDM)是一種高效的數(shù)據(jù)傳輸方式,并且它具備很高的頻譜利用率。與單載波技術(shù)相比,多載波技術(shù)的峰均功率比(Peak to Average Power Ratio,PAPR)過高,而且實現(xiàn)成本高。如果在帶寬可以滿足業(yè)務(wù)需求的情況下,就可以使用單載波系統(tǒng)。PAPR偏大是單載波技術(shù)和多載波技術(shù)共同擁有的問題。至今,大部分的研究工作都集中在對OFDM系統(tǒng)的PAPR優(yōu)化上,而對如何優(yōu)化單載波PAPR的方法很少。本文主要是對降低單載波微波系統(tǒng)PAPR展開討論和研究。因為所有調(diào)制系統(tǒng)PAPR的優(yōu)化算法中除了限幅算法,其他都不能直接用于降低單載波微波系統(tǒng)PAPR,因此本文主要通過深入研究降低調(diào)制系統(tǒng)的PAPR的傳統(tǒng)算法,然后將這些算法思想應(yīng)用在降低單載波微波系統(tǒng)PAPR中去。雖然限幅算法會造成信號的畸變,但是通過濾波可以減小信號的損失,因此可以結(jié)合限幅算法的思想。本文首先分析PAPR與信號幅值的關(guān)系,構(gòu)建了一個無窮范數(shù)的數(shù)學(xué)模型,這是算法提出的核心。然后基于無窮范數(shù)模型,引入信號分段的思想,再結(jié)合限幅算法和壓擴(kuò)變換算法,最后提出了三種抑制單載波微波系統(tǒng)PAPR的算法,即分段縮放濾波算法,分段限幅縮放濾波算法和循環(huán)抑制算法。文章首先描述了無窮范數(shù)模型的數(shù)學(xué)原理,以及模型的詳細(xì)推導(dǎo),然后介紹了三種算法的理論分析和公式推導(dǎo),并通過數(shù)值實驗實現(xiàn)這三種算法,最后對無窮范數(shù)模型進(jìn)行了改進(jìn),同時也對基于新模型的三種算法進(jìn)行了仿真。從結(jié)果可以看出三種算法在滿足頻譜模板的條件下,都能有效的抑制單載波微波系統(tǒng)PAPR,而且EVM和BER性能都很好。并且與傳統(tǒng)的限幅算法比較,提出的三種新算法降低PAPR的幅度遠(yuǎn)遠(yuǎn)大于它,尤其是第三種循環(huán)抑制算法。因此本文在降低單載波微波系統(tǒng)PAPR上取得了有效的成果。
[Abstract]:In today's Internet age, wireless communication is booming, especially mobile communication, which makes spectrum become a precious and scarce resource. Orthogonal Frequency Division Multiplexing (OFDM) is an efficient data transmission method, and it has a high spectral efficiency. Compared with the technology, the Peak to Average Power Ratio (PAPR) of multi-carrier technology is too high, and the cost of implementation is too high. If the bandwidth can meet the service requirements, the single-carrier system can be used. In this paper, we mainly discuss and study how to reduce the PAPR of the single-carrier microwave system. Because all the optimization algorithms of the modulation system PAPR can not be directly used to reduce the PAPR of the single-carrier microwave system except the amplitude limiting algorithm, so this paper mainly talks about how to reduce the PAPR of the single-carrier microwave system. The traditional algorithms for reducing the PAPR of modulation system are studied in depth, and then these algorithms are applied to reduce the PAPR of single-carrier microwave system. Although the amplitude-limiting algorithm can cause signal distortion, the loss of signal can be reduced by filtering, so the idea of amplitude-limiting algorithm can be combined. Firstly, the PAPR and signal amplitude are analyzed. Then, based on the infinite norm model, the idea of signal segmentation is introduced, combined with the amplitude limiting algorithm and companding transform algorithm, three algorithms are proposed to suppress the PAPR of single-carrier microwave system, namely, the piecewise scaling filtering algorithm and the piecewise limiting scaling filtering algorithm. Firstly, this paper describes the mathematical principle of the infinite norm model and the detailed derivation of the model, then introduces the theoretical analysis and formula derivation of the three algorithms, and implements the three algorithms through numerical experiments. Finally, the infinite norm model is improved, and three algorithms based on the new model are also improved. The simulation results show that the three algorithms can effectively suppress the PAPR of single-carrier microwave system under the condition of satisfying the spectrum template, and the performance of EVM and BER is very good. In this paper, we have achieved some effective results in reducing the single carrier microwave system PAPR.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN929.5

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本文編號：2250273