本文選題：水聲通信　切入點：OFDM　出處：《華南理工大學》2014年碩士論文

【摘要】：水聲信道的頻帶極其有限和多徑干擾十分嚴重是目前制約水聲通信數(shù)據(jù)率提高的主要瓶頸。正交頻分復用（OFDM）技術(shù)具有抗多徑干擾和頻譜利用率高等特性被大量通信標準所采用，是目前實現(xiàn)高速水聲通信的常用技術(shù)�，F(xiàn)有的通信系統(tǒng)一般存在硬件較復雜，成本較高，且不利于升級和更新等問題，軟件無線電的出現(xiàn)，大大簡化了系統(tǒng)的硬件結(jié)構(gòu)，系統(tǒng)工作頻率、系統(tǒng)帶寬、調(diào)制方式、信源編碼等可進行編程控制，使得系統(tǒng)靈活性顯著增強，節(jié)省成本且便于升級。 結(jié)合OFDM和軟件無線電兩種技術(shù)的優(yōu)勢，本文設(shè)計了一種基于軟件無線電技術(shù)的高速水聲通信系統(tǒng)。論文詳細描述了系統(tǒng)框架、軟硬件設(shè)計和信號處理流程。其中，硬件部分主要由信號發(fā)生卡、功放電路、水聲換能器、信號采集卡和計算機組成。論文根據(jù)系統(tǒng)要求設(shè)計了功率放大電路，，闡述了功放各部分的原理和結(jié)構(gòu)。系統(tǒng)的軟件設(shè)計是本文的重點，軟件系統(tǒng)采用多線程并行運行架構(gòu)，信號的采集和發(fā)生，信號的調(diào)制與解調(diào)，系統(tǒng)主控程序等模塊分別采用不同線程，論文對這些模塊進行了詳細設(shè)計與實現(xiàn)。 最后，經(jīng)過多次基于不同環(huán)境的水聲實驗，驗證了該系統(tǒng)具有可靠的傳輸性能，系統(tǒng)傳輸速率可達到6.3kbps-10kps。本文對各種實驗數(shù)據(jù)進行了分析，得到了在不同環(huán)境和傳輸距離下的信道特性。本系統(tǒng)在遠距離傳輸中表現(xiàn)的性能不夠理想，誤碼較高，因此如何改善數(shù)據(jù)處理的過程并優(yōu)化算法，是下一步要研究的方向。
[Abstract]:The limited frequency band and serious multipath interference of underwater acoustic channel are the main bottlenecks to improve the data rate of underwater acoustic communication at present. Orthogonal Frequency Division Multiplexing (OFDM) technology has the characteristics of anti-multipath interference and high spectral efficiency, which are adopted by a large number of communication standards. It is a common technology to realize high speed underwater acoustic communication at present. The existing communication systems generally have some problems such as complex hardware, high cost, and not conducive to upgrading and updating. The appearance of software radio greatly simplifies the hardware structure of the system. The system operating frequency, system bandwidth, modulation mode, source coding and so on can be programmatically controlled, which makes the system flexible, cost saving and easy to upgrade. Combining the advantages of OFDM and software radio, a high speed underwater acoustic communication system based on software radio technology is designed in this paper. The system framework, software and hardware design and signal processing flow are described in detail. The hardware is mainly composed of signal generator card, power amplifier circuit, underwater acoustic transducer, signal acquisition card and computer. The principle and structure of various parts of power amplifier are expounded. The software design of the system is the focus of this paper. The software system adopts multi-thread parallel running architecture, signal acquisition and generation, signal modulation and demodulation. The main control program of the system adopts different threads, and these modules are designed and implemented in detail. Finally, after many underwater acoustic experiments based on different environments, it is proved that the system has reliable transmission performance, and the transmission rate of the system can reach 6.3 kbps-10kps.All kinds of experimental data are analyzed in this paper. The channel characteristics in different environments and transmission distances are obtained. The performance of the system in long-distance transmission is not ideal and the error code is high. Therefore, how to improve the process of data processing and optimize the algorithm is the next research direction.
【學位授予單位】：華南理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN929.3

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