基于BICM-ID的脉冲干扰抑制研究

发布时间：2018-06-01 23:28

本文选题：L波段数字航空通信系统1 + ICI　；参考：《中国民航大学》2017年硕士论文

【摘要】：为了满足未来航空通信系统的要求,L波段数字航空通信系统1(L-DACS1)系统应运而生。L-DACS1系统是一种多应用蜂窝宽带系统,能够同时提供各种空中交通服务(ATS)和航空运行管理(AOC)通信服务。由于L波段已经被诸如DME的其它系统利用,空闲的光谱资源稀缺且难以分配。为了合理利用现有的频谱资源,L-DACS1系统以内嵌方式部署在DME波段间。针对测距仪脉冲信号干扰OFDM接收机的关键技术问题,本论文开展了基于BICM-ID的测距仪脉冲干扰抑制的研究,论文开展以下主要研究:第一,对DME干扰影响L-DACS1系统OFDM接收机的问题进行研究。首先,给出航空无线电导航具体频谱分布;然后,开展DME信号对L-DACS1系统接收机干扰分析:进行DME信号干扰功率计算,并给出了闭合表达式;最后,通过计算机仿真表明:测距仪脉冲干扰会严重恶化L-DACS1系统传输链路的可靠性。第二,提出了一种基于压缩感知与ICI补偿的BICM-ID脉冲干扰抑制方法。首先,将接收信号分别送入子载波间干扰补偿(ICI)支路与压缩感知支路;在ICI支路,针对脉冲熄灭后产生的ICI干扰进行时域补偿,补偿过程属于迭代过程;迭代收敛后,将来自ICI补偿支路的软信息送入压缩感知脉支路,同时,将来自压缩感知支路译码器输出的软信息送入ICI补偿支路;迭代译码使得解调器与译码器之间能够相互传递信息,从而使得彼此能够从相互传递的信息中受益,最终实现译码器性能的提高。仿真结果表明:基于联合压缩感知与ICI补偿的BICM-ID干扰消除方案可以有效抑制测距仪脉冲干扰,从而提升L-DACS1系统链路传输的可靠性。
[Abstract]:In order to meet the requirements of future aviation communication systems, L-DACS1 (L-DACS1) system emerges as the times require. The L-DACS1 system is a kind of multi-application cellular broadband system, which can provide various air traffic services (ATS) and aviation operation management (AOC) communication services at the same time. Since L-band has been used by other systems such as DME, free spectral resources are scarce and difficult to allocate. In order to make rational use of the existing spectrum resource, the L-DACS1 system is embedded in the DME band. Aiming at the key technical problems of the range finder pulse signal jamming OFDM receiver, this paper develops the research of the range finder pulse interference suppression based on BICM-ID. The main research work is as follows: first, The influence of DME interference on OFDM receiver in L-DACS1 system is studied. First, the specific spectrum distribution of aeronautical radio navigation is given. Then, the interference analysis of DME signal to L-DACS1 system receiver is carried out: the interference power of DME signal is calculated, and the closed expression is given. The computer simulation shows that the pulse interference of the range finder will seriously deteriorate the reliability of the transmission link of the L-DACS1 system. Secondly, a BICM-ID pulse interference suppression method based on compression sensing and ICI compensation is proposed. First of all, the received signals are fed into the ICI branch and the compression sensing branch, respectively. In the ICI branch, the ICI interference caused by the pulse extinguishing is compensated in time domain, and the compensation process is an iterative process. The soft information from the ICI compensation branch is fed into the compressed sensing pulse branch, and the soft information from the compressed sensing branch decoder is fed into the ICI compensation branch.; the iterative decoding enables the demodulator and the decoder to transmit information to each other. Thus, each other can benefit from the information transmitted to each other, and finally improve the performance of the decoder. The simulation results show that the BICM-ID interference cancellation scheme based on joint compression sensing and ICI compensation can effectively suppress the pulse interference of the rangefinder and improve the reliability of the L-DACS1 system link transmission.
【学位授予单位】：中国民航大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：V243.1;TN972

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