本文選題：L波段數(shù)字航空通信系統(tǒng)1 + 正交頻分復用　； 參考：《中國民航大學》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L波段數(shù)字航空通信系統(tǒng)的一個候選方案,采用頻分雙工(FDD)與正交頻分復用(OFDM)技術。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波段測距儀(DME)系統(tǒng)頻道間。因此OFDM接收機不可避免的會受到DME信號的強烈干擾。為了抑制DME脈沖干擾,本文提出了基于小波變換的L-DACS1機載接收機方案。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,給出了測距儀的工作原理和信號模型。在典型的干擾場景下,詳細分析了DME對L-DACS1機載接收機的干擾影響。然后,介紹了測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,并仿真驗證了常規(guī)方法對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距儀脈沖干擾抑制方法,采用小波變換去噪方法重構測距儀脈沖信號,然后通過時域脈沖干擾消除抑制測距儀脈沖干擾。計算機仿真結果顯示: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.
【學位授予單位】：中國民航大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：V243.1;TN972

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本文編號：1811422