本文選題：正交頻分復(fù)用　切入點(diǎn)：脈沖熄滅　出處：《中國民航大學(xué)》2017年碩士論文

【摘要】：現(xiàn)代通信系統(tǒng)中,常用的一種調(diào)制方法是正交頻分復(fù)用(OFDM),其為多載波調(diào)制方法。然而在實(shí)際應(yīng)用中,OFDM系統(tǒng)經(jīng)常存在脈沖干擾,由于系統(tǒng)中脈沖干擾的統(tǒng)計(jì)特性與高斯白噪聲(AWGN)的統(tǒng)計(jì)特性差異較大,導(dǎo)致OFDM系統(tǒng)中符號差錯概率(SER)性能顯著惡化,因此在OFDM系統(tǒng)的接收機(jī)中需要消除脈沖干擾。針對此問題,論文在OFDM系統(tǒng)中開展脈沖干擾抑制方法與性能的研究。論文主要工作如下:第一,為定量分析非線性脈沖干擾抑制方法對OFDM接收機(jī)鏈路傳輸可靠性的影響,本文首先將脈沖干擾建模為伯努利~復(fù)高斯模型,在頻率選擇性衰落信道下,理論分析給出了峰值脈沖熄滅、峰值脈沖限幅OFDM接收機(jī)解調(diào)器輸出信噪比(SNR)的計(jì)算過程。然后,以此為基礎(chǔ)定量解析給出非線性O(shè)FDM接收機(jī)在瑞利衰落信道與萊斯衰落信道下,采用多進(jìn)制相移鍵控(MPSK)調(diào)制方式和多進(jìn)制正交幅度調(diào)制(MQAM)調(diào)制方式的SER計(jì)算公式。最后,搭建了非線性O(shè)FDM接收機(jī)差錯性能仿真平臺,驗(yàn)證了理論推導(dǎo)的準(zhǔn)確性,研究結(jié)論如下:1)OFDM系統(tǒng)中每個子信道具有同樣的SER性能;2)在相同條件下,基于峰值脈沖熄滅的OFDM接收機(jī)性能優(yōu)于峰值脈沖限幅的OFDM接收機(jī)性能。第二,為了解決非線性O(shè)FDM接收機(jī)在瑞利衰落信道下脈沖熄滅門限的最優(yōu)設(shè)置問題,論文提出基于信干噪比(SINR)最大化標(biāo)準(zhǔn)準(zhǔn)則的最優(yōu)脈沖熄滅門限設(shè)置方法。首先,論文給出通用的非線性O(shè)FDM接收機(jī)輸出SINR的閉合公式。然后,以此為基礎(chǔ)提出基于SINR最大化標(biāo)準(zhǔn)準(zhǔn)則的脈沖熄滅最優(yōu)門限計(jì)算方法。最后,進(jìn)一步給出基于最優(yōu)門限的OFDM接收機(jī)SER計(jì)算過程,同時在頻率選擇性瑞利衰落信道下搭建了系統(tǒng)仿真平臺,仿真結(jié)果驗(yàn)證了所提出方法的正確性。
[Abstract]:In modern communication systems, one of the common modulation methods is orthogonal Frequency Division Multiplexing (OFDM), which is a multicarrier modulation method. Because the statistical characteristics of pulse interference in OFDM system are different from those of Gao Si white noise system, the performance of symbol error probability in OFDM system is obviously deteriorated, so it is necessary to eliminate the pulse interference in the receiver of OFDM system. The main work of this paper is as follows: first, to quantitatively analyze the effect of nonlinear pulse interference suppression on the link transmission reliability of OFDM receiver. In this paper, the pulse interference is modeled as Bernoulli complex Gao Si model. In frequency selective fading channel, the calculation process of peak pulse quenching and output SNR of peak pulse limiting OFDM receiver demodulator is given. On this basis, the formulas for calculating the SER of nonlinear OFDM receiver in Rayleigh fading channel and Rice fading channel are given, which adopt the modulation mode of multi-ary phase shift keying keying (MPSKK) and the modulation of multi-ary quadrature amplitude modulation (MQAM). A nonlinear OFDM receiver error performance simulation platform is built to verify the accuracy of the theoretical derivation. The research results are as follows: each sub-channel in the OFDM system has the same SER performance under the same conditions. The performance of OFDM receiver based on peak pulse quenching is better than that of OFDM receiver with peak pulse limiting. Secondly, in order to solve the problem of optimal setting of pulse extinction threshold for nonlinear OFDM receiver in Rayleigh fading channel, In this paper, an optimal pulse quenching threshold setting method based on the SINR maximization criterion is proposed. Firstly, a general closed formula for the output SINR of a nonlinear OFDM receiver is presented. Based on this, an optimal threshold calculation method for pulse quenching based on SINR maximization criterion is proposed. Finally, the SER calculation process of OFDM receiver based on optimal threshold is further presented. At the same time, the system simulation platform is built in frequency-selective Rayleigh fading channel, and the simulation results verify the correctness of the proposed method.
【學(xué)位授予單位】：中國民航大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN929.53

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