無(wú)線光通信信道編碼與調(diào)制的研究
發(fā)布時(shí)間：2019-06-06 17:47
【摘要】：自由空間光通信(Free Space Optical, FSO)指利用激光束作為載體在大氣中進(jìn)行圖像、數(shù)據(jù)、語(yǔ)音信息雙向傳輸?shù)囊环N技術(shù),它具有很多優(yōu)點(diǎn),例如保密性好、信息容量大、傳輸速率高、組網(wǎng)靈活、成本低等�？臻g光通信在民用、國(guó)防等相應(yīng)領(lǐng)域具有非常廣闊的應(yīng)用前景,已成為無(wú)線通信、大容量、保密研究的熱點(diǎn)。由于激光在空間中傳輸時(shí)會(huì)受到背景光、大氣減效應(yīng)以及大氣湍效應(yīng)等多種因素的影響,從而導(dǎo)致大氣信道存在衰落、多徑干擾等現(xiàn)象,這些因素的影響導(dǎo)致了空間無(wú)通信鏈路總是存在不同程度質(zhì)量的下降。因此,研究、開(kāi)發(fā)具有高速率、高抗干擾性能的信道編碼技術(shù)成為光通信的重要課題之一。本文首先回顧了空間光通信技術(shù)的發(fā)展?fàn)顩r,介紹了其優(yōu)勢(shì),且對(duì)其關(guān)鍵技術(shù)進(jìn)行了分析比較。其次對(duì)大氣隨機(jī)信道進(jìn)行了建模,為后續(xù)章節(jié)信道參數(shù)的設(shè)定提供了參考。然后,本文在LDPC碼理論基礎(chǔ)上,介紹了一種非規(guī)則LDPC碼的構(gòu)造方法。分析比較了 OOK、PPM、DPIM這三種調(diào)制方式的性能,仿真結(jié)果表明PPM調(diào)制更適合應(yīng)用到無(wú)線光通信中,所以本文選擇將PPM調(diào)制作為無(wú)線光通信系統(tǒng)的調(diào)制方式。基于MATLAB仿真軟件,對(duì)不同參數(shù)下的糾錯(cuò)性能進(jìn)行了仿真驗(yàn)證,為下文譯碼算法提供合適參數(shù)。將這種非規(guī)則LDPC碼應(yīng)用到一種PPM解調(diào)與LDPC碼聯(lián)合迭代譯碼的算法中,通過(guò)仿真驗(yàn)證了非規(guī)則LDPC碼應(yīng)用到PPM解調(diào)與LDPC碼聯(lián)合迭代譯碼的算法中對(duì)無(wú)線光通信系統(tǒng)的性能有顯著提高。最后,在Quartus Ⅱ仿真平臺(tái)上,選用Altera公司StratixⅡ系列型號(hào)為EP2S15F672I4芯片,利用Verilog硬件語(yǔ)言進(jìn)行編程,仿真實(shí)現(xiàn)了這種非規(guī)則LDPC碼的編碼器和譯碼器,并通過(guò)MATLAB和Quartus Ⅱ軟件的聯(lián)合,對(duì)硬件仿真的結(jié)果進(jìn)行了測(cè)試。
[Abstract]:Free space optical communication (Free Space Optical, FSO) refers to a technology that uses laser beam as carrier for bidirectional transmission of image, data and voice information in the atmosphere. It has many advantages, such as good confidentiality, large information capacity and high transmission rate. Flexible networking, low cost and so on. Space optical communication has a very broad application prospect in civil, national defense and other corresponding fields, and has become the focus of wireless communication, large capacity and security research. Because the laser propagation in space will be affected by many factors, such as background light, atmospheric subtraction effect and atmospheric turbulence effect, which leads to the fading of atmospheric channel, multi-path interference and so on. The influence of these factors leads to the decline of the quality of space communication links to varying degrees. Therefore, the research and development of channel coding technology with high speed and high anti-interference performance has become one of the important topics in optical communication. In this paper, the development of space optical communication technology is reviewed, its advantages are introduced, and its key technologies are analyzed and compared. Secondly, the atmospheric random channel is modeled, which provides a reference for the setting of channel parameters in the following chapters. Then, on the basis of LDPC code theory, this paper introduces a construction method of irregular LDPC code. The performance of OOK,PPM,DPIM is analyzed and compared. the simulation results show that PPM modulation is more suitable for wireless optical communication, so this paper chooses PPM modulation as the modulation mode of wireless optical communication system. Based on MATLAB simulation software, the error correction performance under different parameters is verified by simulation, which provides suitable parameters for the following decoding algorithms. The irregular LDPC code is applied to a joint iterative decoding algorithm of PPM demodulation and LDPC code. The simulation results show that the performance of wireless optical communication system is significantly improved by the application of irregular LDPC code to the joint iterative decoding algorithm of PPM demodulation and LDPC code. Finally, on the Quartus II simulation platform, the Stratix II series model of Altera company is selected as the EP2S15F672I4 chip, and the Verilog hardware language is used to program the encoder and decoder of the irregular LDPC code, and the encoder and decoder of the irregular LDPC code are simulated and realized by the combination of MATLAB and Quartus II software. The results of hardware simulation are tested.
【學(xué)位授予單位】：哈爾濱工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN929.1
[Abstract]:Free space optical communication (Free Space Optical, FSO) refers to a technology that uses laser beam as carrier for bidirectional transmission of image, data and voice information in the atmosphere. It has many advantages, such as good confidentiality, large information capacity and high transmission rate. Flexible networking, low cost and so on. Space optical communication has a very broad application prospect in civil, national defense and other corresponding fields, and has become the focus of wireless communication, large capacity and security research. Because the laser propagation in space will be affected by many factors, such as background light, atmospheric subtraction effect and atmospheric turbulence effect, which leads to the fading of atmospheric channel, multi-path interference and so on. The influence of these factors leads to the decline of the quality of space communication links to varying degrees. Therefore, the research and development of channel coding technology with high speed and high anti-interference performance has become one of the important topics in optical communication. In this paper, the development of space optical communication technology is reviewed, its advantages are introduced, and its key technologies are analyzed and compared. Secondly, the atmospheric random channel is modeled, which provides a reference for the setting of channel parameters in the following chapters. Then, on the basis of LDPC code theory, this paper introduces a construction method of irregular LDPC code. The performance of OOK,PPM,DPIM is analyzed and compared. the simulation results show that PPM modulation is more suitable for wireless optical communication, so this paper chooses PPM modulation as the modulation mode of wireless optical communication system. Based on MATLAB simulation software, the error correction performance under different parameters is verified by simulation, which provides suitable parameters for the following decoding algorithms. The irregular LDPC code is applied to a joint iterative decoding algorithm of PPM demodulation and LDPC code. The simulation results show that the performance of wireless optical communication system is significantly improved by the application of irregular LDPC code to the joint iterative decoding algorithm of PPM demodulation and LDPC code. Finally, on the Quartus II simulation platform, the Stratix II series model of Altera company is selected as the EP2S15F672I4 chip, and the Verilog hardware language is used to program the encoder and decoder of the irregular LDPC code, and the encoder and decoder of the irregular LDPC code are simulated and realized by the combination of MATLAB and Quartus II software. The results of hardware simulation are tested.
【學(xué)位授予單位】：哈爾濱工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN929.1
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