本文選題：低信噪比BPSK信號(hào)　切入點(diǎn)：混沌理論　出處：《哈爾濱工業(yè)大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：在數(shù)字調(diào)制技術(shù)領(lǐng)域，BPSK(Binary Phase Shift Keying)調(diào)制方式是一種最基本、最常用的調(diào)制技術(shù)。而即使是數(shù)字調(diào)制信號(hào)，在復(fù)雜的環(huán)境中傳輸，不可避免的會(huì)受到強(qiáng)噪聲的影響。傳統(tǒng)的BPSK信號(hào)接收技術(shù)，只能解調(diào)信噪比為0dB以上的BPSK信號(hào)，這已經(jīng)不能滿(mǎn)足現(xiàn)今通信傳輸?shù)囊蟆?研究低信噪比BPSK信號(hào)接收技術(shù)的目的，是為了在強(qiáng)噪聲背景下解調(diào)出BPSK信號(hào)。本文從混沌理論的概念出發(fā)，研究混沌系統(tǒng)的基本特性的同時(shí)，列舉了幾個(gè)經(jīng)典的混沌模型。尤其針對(duì)Duffing系統(tǒng)，研究了其對(duì)噪聲的免疫能力以及外加信號(hào)的相位和頻率對(duì)它的影響。并提出了基于Duffing系統(tǒng)的低信噪比BPSK信號(hào)的接收方法，在通過(guò)仿真分析驗(yàn)證此系統(tǒng)可行性的同時(shí)也發(fā)現(xiàn)此系統(tǒng)存在較為棘手的問(wèn)題。在此基礎(chǔ)上，本文將同步控制算法與混沌系統(tǒng)相結(jié)合，提出了一種基于混沌同步算法接收低信噪比BPSK信號(hào)的方法。此方法主要分為兩個(gè)部分，第一部分是利用Duffing方程和快速梯度法將低信噪比的BPSK信號(hào)進(jìn)行波形恢復(fù)，提高信號(hào)波形的信噪比；第二部分是利用傳統(tǒng)的相干解調(diào)的方法，將恢復(fù)好的波形進(jìn)行解調(diào)。本文利用Matlab/Simulink構(gòu)建了混沌同步系統(tǒng)的模型，并進(jìn)行了仿真分析，驗(yàn)證了此方法的可行性。其中，本論文的核心所在是波形恢復(fù)部分。針對(duì)這部分算法，本論文不僅要利用Matlab進(jìn)行仿真分析，同時(shí)將通過(guò)Verilog HDL語(yǔ)言，編寫(xiě)混沌同步系統(tǒng)的模塊，并調(diào)用ROM IP核來(lái)產(chǎn)生低信噪比的BPSK信號(hào)，最后利用ISE軟件進(jìn)行行為仿真，得出仿真結(jié)果，進(jìn)行仿真分析，，進(jìn)一步驗(yàn)證了基于混沌同步的低信噪比BPSK信號(hào)接收技術(shù)的可行性。
[Abstract]:In the field of digital modulation technology, BPSK Phase binary Phase Shift Keying is one of the most basic and commonly used modulation techniques, and even digital modulation signals are transmitted in complex environments. The traditional BPSK signal receiving technique can only demodulate the BPSK signal whose SNR is above 0 dB, which can not meet the requirement of communication transmission. The purpose of this paper is to demodulate the BPSK signal under strong noise in order to demodulate the BPSK signal with low signal-to-noise ratio (SNR). In this paper, the basic characteristics of chaotic system are studied based on the concept of chaos theory. Several classical chaotic models are listed, especially for Duffing system, the immune ability to noise and the effect of the phase and frequency of external signal on it are studied. The method of receiving BPSK signal with low signal-to-noise ratio based on Duffing system is proposed. At the same time, the feasibility of the system is verified by simulation analysis. On the basis of this, the synchronization control algorithm is combined with the chaotic system. This paper presents a method to receive BPSK signal with low SNR based on chaotic synchronization algorithm. The method is divided into two parts. In the first part, the waveform of BPSK signal with low SNR is recovered by using Duffing equation and fast gradient method. The second part is to demodulate the recovered waveform by using the traditional coherent demodulation method. In this paper, the model of chaotic synchronization system is constructed by using Matlab/Simulink, and the simulation analysis is carried out. The feasibility of this method is verified. The core of this paper is waveform recovery. In view of this algorithm, this paper not only uses Matlab to simulate and analyze, but also compiles the module of chaotic synchronization system through Verilog HDL language. The ROM IP core is used to generate the BPSK signal with low SNR. Finally, the behavior simulation is carried out by using ISE software, and the simulation results are obtained and analyzed. The feasibility of the low signal-to-noise ratio (BPSK) signal receiving technology based on chaos synchronization is further verified.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TN911.25

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