發(fā)布時(shí)間：2018-03-01 08:04

  本文關(guān)鍵詞： 水下通信 LDPC編譯碼 LMS算法 信道均衡 瑞利衰落 萊斯衰落　出處：《昆明理工大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：隨著通信技術(shù)在理論和實(shí)踐方面的不斷發(fā)展,水下通信的研究也攻克了一個(gè)又一個(gè)的難題,技術(shù)也越來(lái)越進(jìn)步。水下通信系統(tǒng)模型的建立作為水下通信的重要環(huán)節(jié),涉及許多水聲學(xué)的關(guān)鍵技術(shù),這些技術(shù)也成了許多學(xué)者研究的熱點(diǎn),包括根據(jù)特定的水下環(huán)境仿真水聲信道,對(duì)水聲信道進(jìn)行建模分析,以及真實(shí)的水下通信系統(tǒng)存在的問(wèn)題:多徑效應(yīng),多普勒頻移以及海洋噪聲等。通過(guò)這些技術(shù)實(shí)際仿真出的水聲信道才能更真實(shí)地分析水下環(huán)境,并在此基礎(chǔ)上研究如何提高水聲通信系統(tǒng)的數(shù)據(jù)傳輸效率、系統(tǒng)性能、降低傳輸復(fù)雜度和信息誤碼率,通過(guò)使用不同的算法實(shí)現(xiàn)模型仿真并比較這些算法性能的優(yōu)缺點(diǎn)。本文主要研究淺海水聲信道特征,應(yīng)用LDPC碼在水下聲信道進(jìn)行信息傳輸,同時(shí)對(duì)水聲信道進(jìn)行改進(jìn)以提高水聲通信系統(tǒng)性能,選擇合適的LDPC編譯碼算法進(jìn)行數(shù)據(jù)傳輸,進(jìn)一步增加水下通信系統(tǒng)的信道帶寬利用率和提高數(shù)據(jù)傳輸?shù)目煽啃浴１疚氖紫仍敿?xì)介紹了與水下通信系統(tǒng)相關(guān)內(nèi)容的研究現(xiàn)狀,對(duì)涉及水聲通信的關(guān)鍵技術(shù)進(jìn)行理論研究,包括水聲信道特征、信息編譯碼方式以及影響水下通信系統(tǒng)的環(huán)境噪聲等,使用計(jì)算機(jī)仿真的水聲信道包括淺海短距離和淺海中遠(yuǎn)距離信道。主要使用MATLAB建模仿真多徑衰落模型,模擬水下通信中存在的問(wèn)題,分析信息在水下信道傳輸情況。其次本文在仿真水下信道之前提出了使用歸一化LMS算法對(duì)水聲信道進(jìn)行均衡,大大地降低了信道模型的復(fù)雜度,提高了通信速率。在編譯碼方面,選擇了抗干擾、抗衰落、抗噪聲性能較好的LDPC碼,詳細(xì)分析并研究了 LDPC碼編譯的基本算法思想以及構(gòu)造方式,選擇適合于水聲信道的規(guī)則化LDPC編碼和BF譯碼,選取合適的參數(shù)進(jìn)行仿真分析,降低了 LDPC碼的復(fù)雜度。最后將LDPC碼應(yīng)用到水下通信系統(tǒng)中,綜合討論了 LDPC碼應(yīng)用于水聲通信的優(yōu)缺點(diǎn),進(jìn)行仿真分析,建立了 LDPC碼在不同水聲信道的仿真模型,通過(guò)MATLAB仿真對(duì)比LDPC碼在不同調(diào)制方式、不同水下信道以及不同碼長(zhǎng)下的性能。本文主要仿真分析了 LDPC碼在不同水聲信道、不同碼長(zhǎng)和不同調(diào)制方式下的性能,并對(duì)信道進(jìn)行均衡改進(jìn),系統(tǒng)仿真了 LDPC碼的編碼性能,達(dá)到了較好的通信傳輸效果,為實(shí)際應(yīng)用提供了理論指導(dǎo)。
[Abstract]:With the development of communication technology in theory and practice, the research of underwater communication has overcome one problem after another, and the technology is more and more advanced. The establishment of underwater communication system model is an important link in underwater communication. It involves many key technologies of underwater acoustics, and these technologies have also become the focus of many scholars, including modeling and analysis of underwater acoustic channels according to the underwater environment simulation of underwater acoustic channels. And the problems of real underwater communication system, such as multipath effect, Doppler frequency shift and ocean noise, etc. The underwater environment can be analyzed more realistically by the underwater acoustic channel simulated by these technologies. On this basis, how to improve the data transmission efficiency, system performance and reduce the transmission complexity and bit error rate of underwater acoustic communication system is studied. By using different algorithms to simulate the models and compare the advantages and disadvantages of these algorithms, this paper mainly studies the characteristics of shallow water acoustic channel, and uses LDPC code to transmit information in underwater acoustic channel. At the same time, the underwater acoustic channel is improved to improve the performance of underwater acoustic communication system, and the appropriate LDPC encoding and decoding algorithm is selected for data transmission. Further increase the channel bandwidth utilization rate of underwater communication system and improve the reliability of data transmission. Firstly, this paper introduces the research status of underwater communication system in detail, and studies the key technologies of underwater acoustic communication in theory. Including underwater acoustic channel features, information encoding and decoding methods, and the impact of underwater communication system environment noise, etc. The underwater acoustic channel simulated by computer includes short distance channel in shallow water and medium and long distance channel in shallow water. MATLAB is used to model and simulate multipath fading model to simulate the problems existing in underwater communication. Secondly, a normalized LMS algorithm is proposed to equalize the underwater acoustic channel before simulating the underwater channel, which greatly reduces the complexity of the channel model. In the aspect of encoding and decoding, LDPC codes with good anti-interference, anti-fading and anti-noise performance are selected. The basic algorithm and construction of LDPC coding are analyzed and studied in detail. The regularized LDPC codes and BF codes suitable for underwater acoustic channels are selected, and the appropriate parameters are selected for simulation analysis. The complexity of LDPC codes is reduced. Finally, the LDPC codes are applied to underwater communication systems. The advantages and disadvantages of the application of LDPC codes in underwater acoustic communication are discussed synthetically. The simulation models of LDPC codes in different underwater acoustic channels are established, and the LDPC codes in different modulation modes are compared by MATLAB simulation. In this paper, the performance of LDPC codes in different underwater channels, different code lengths and different modulation modes is simulated and analyzed, and the channel equalization is improved. The system simulates the coding performance of LDPC code and achieves good communication transmission effect, which provides theoretical guidance for practical application.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TN929.3;TN911.22

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