本文選題：L波段數(shù)字航空通信系統(tǒng)1 + 正交頻分復(fù)用��； 參考：《中國(guó)民航大學(xué)》2014年碩士論文

【摘要】：L波段數(shù)字航空通信系統(tǒng)1(L-DACS1)是未來(lái)L波段數(shù)字航空通信系統(tǒng)的一個(gè)候選方案,采用頻分雙工(FDD)與正交頻分復(fù)用(OFDM)技術(shù)。由于L波段的頻譜資源稀缺,L-DACS1系統(tǒng)以內(nèi)嵌的方式工作在L波段測(cè)距儀(DME)系統(tǒng)頻道間。因此OFDM接收機(jī)不可避免的會(huì)受到DME信號(hào)的強(qiáng)烈干擾。為了抑制DME脈沖干擾,本文提出了基于小波變換的L-DACS1機(jī)載接收機(jī)方案。首先,根據(jù)L-DACS1系統(tǒng)協(xié)議規(guī)范,介紹了L-DACS1的系統(tǒng)參數(shù)和工作原理。其次,給出了測(cè)距儀的工作原理和信號(hào)模型。在典型的干擾場(chǎng)景下,詳細(xì)分析了DME對(duì)L-DACS1機(jī)載接收機(jī)的干擾影響。然后,介紹了測(cè)距儀脈沖干擾抑制常規(guī)方法,脈沖熄滅算法和脈沖限幅算法,并仿真驗(yàn)證了常規(guī)方法對(duì)L-DACS1系統(tǒng)比特誤碼率(BER)性能的影響。最后,本文提出了基于小波變換的測(cè)距儀脈沖干擾抑制方法,采用小波變換去噪方法重構(gòu)測(cè)距儀脈沖信號(hào),然后通過時(shí)域脈沖干擾消除抑制測(cè)距儀脈沖干擾。計(jì)算機(jī)仿真結(jié)果顯示:在高斯白噪聲信道環(huán)境下和多徑信道環(huán)境下,本文提出的接收機(jī)方案可顯著提高鏈路傳輸可靠性。
[Abstract]:L-band digital aeronautical communication system (1LDACS1) is a candidate scheme for the future L-band digital aviation communication system. It adopts the technology of frequency division duplex (FDD) and orthogonal frequency division multiplexing (OFDM). The L-DACS1 system works in an embedded manner between the channels of the L-band rangefinder DME-system due to the scarcity of spectrum resources in the L-band. Therefore, the OFDM receiver will inevitably be strongly interfered with by the DME signal. In order to suppress DME pulse interference, a scheme of L-DACS1 airborne receiver based on wavelet transform is proposed in this paper. Firstly, according to the L-DACS1 system protocol specification, the system parameters and working principle of L-DACS1 are introduced. Secondly, the working principle and signal model of the range finder are given. In the typical jamming scene, the influence of DME on L-DACS1 airborne receiver is analyzed in detail. Then, the conventional pulse interference suppression method, pulse quenching algorithm and pulse limiting algorithm for rangefinder are introduced, and the effect of conventional methods on bit error rate (BER) performance of L-DACS1 system is verified by simulation. Finally, this paper presents a method of the range finder pulse interference suppression based on wavelet transform. Wavelet transform denoising method is used to reconstruct the range finder pulse signal, and then the time domain pulse interference is eliminated to suppress the range finder pulse interference. Computer simulation results show that the proposed receiver can significantly improve the reliability of link transmission under Gao Si white noise channel environment and multipath channel environment.
【學(xué)位授予單位】：中國(guó)民航大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：V243.1;TN972

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本文編號(hào)：1811422