本文選題：水聲通信　切入點(diǎn)：協(xié)作通信　出處：《哈爾濱工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：近年來(lái),隨著海洋經(jīng)濟(jì)的不斷發(fā)展,以及軍事和商業(yè)應(yīng)用上的需求,水聲通信得到了商業(yè)界和學(xué)術(shù)界的廣泛關(guān)注。然而水聲信道的復(fù)雜多徑傳播、大傳播延遲、有限可用帶寬等特點(diǎn)對(duì)多用戶水聲通信的鏈路可靠性帶來(lái)了巨大的挑戰(zhàn)。為改善鏈路可靠性,本文將協(xié)作通信技術(shù)應(yīng)用于多用戶水聲通信,并在此基礎(chǔ)上針對(duì)水聲信道的特點(diǎn)展開研究,論文的主要研究?jī)?nèi)容如下:首先,建立了非協(xié)作模式下的多用戶水聲通信系統(tǒng)模型,對(duì)水聲信道特性進(jìn)行了分析,并采用BELLHOP模型建立了水聲信道,在IDMA迭代多用戶檢測(cè)算法的基礎(chǔ)上,研究了基于固定抽頭長(zhǎng)度的多用戶檢測(cè)。其次,針對(duì)抽頭長(zhǎng)度會(huì)很大程度上影響多用戶檢測(cè)性能,以及計(jì)算復(fù)雜度的問(wèn)題,提出了非協(xié)作模式下基于變抽頭長(zhǎng)度的多用戶檢測(cè)方案,該方法使用抽頭長(zhǎng)度更新算法根據(jù)水聲信道環(huán)境不同自適應(yīng)調(diào)整抽頭長(zhǎng)度到最優(yōu),從而提高系統(tǒng)性能。為進(jìn)一步提高鏈路可靠性,引入?yún)f(xié)作通信技術(shù),建立了多用戶水聲協(xié)作通信系統(tǒng)模型,綜合考慮合并方式和抽頭長(zhǎng)度對(duì)檢測(cè)性能的影響,提出了聯(lián)合自適應(yīng)合并和變抽頭長(zhǎng)度(JACVT)的多用戶檢測(cè)方案。通過(guò)仿真分析驗(yàn)證了變抽頭長(zhǎng)度多用戶檢測(cè)方案的可行性和有效性。最后,考慮頻譜資源利用率問(wèn)題,引入同時(shí)同頻全雙工技術(shù),建立了基于自干擾消除的非協(xié)作多用戶水聲通信系統(tǒng)模型。針對(duì)該系統(tǒng)中自干擾現(xiàn)象嚴(yán)重問(wèn)題,分析步長(zhǎng)因子和濾波器階數(shù)對(duì)自干擾消除性能的影響,綜合考慮了自干擾、多址干擾和碼間干擾的消除,提出了基于變步長(zhǎng)變階數(shù)自干擾消除的變抽頭長(zhǎng)度(SIC-VT)多用戶檢測(cè)方案。同時(shí)在全雙工協(xié)作模式下,提出了基于自干擾消除的聯(lián)合自適應(yīng)合并和變抽頭長(zhǎng)度(SIC-JACVT)多用戶檢測(cè)方案,進(jìn)一步提升系統(tǒng)性能。通過(guò)仿真分析了自干擾消除的影響因素,證明了變步長(zhǎng)變階數(shù)多用戶檢測(cè)方案的性能優(yōu)勢(shì)。
[Abstract]:In recent years, with the continuous development of marine economy and the demand of military and commercial applications, underwater acoustic communication has received extensive attention in the commercial and academic circles. However, the complex multipath propagation of underwater acoustic channels leads to large propagation delays. The limited available bandwidth brings a great challenge to the link reliability of multi-user underwater acoustic communication. In order to improve the link reliability, this paper applies cooperative communication technology to multi-user underwater acoustic communication. On this basis, the characteristics of underwater acoustic channel are studied. The main contents of this paper are as follows: firstly, the multi-user underwater acoustic communication system model under non-cooperative mode is established, and the characteristics of underwater acoustic channel are analyzed. Based on the IDMA iterative multi-user detection algorithm, the multi-user detection based on fixed tap length is studied. Secondly, the tap length will greatly affect the performance of multi-user detection. As well as the computational complexity, a multi-user detection scheme based on variable tap length in non-cooperative mode is proposed. The tap length updating algorithm is used to adaptively adjust the tap length to the optimum according to the different underwater acoustic channel environment. In order to further improve the link reliability, a multi-user underwater acoustic cooperative communication system model is established by introducing the cooperative communication technology. The influence of combination mode and tap length on the detection performance is considered synthetically. A multiuser detection scheme based on combined adaptive merging and variable tap length (JACVT) is proposed. The feasibility and effectiveness of the multi-user detection scheme with variable tap length are verified by simulation analysis. Finally, the problem of spectrum resource utilization is considered. The simultaneous frequency full-duplex technique is introduced to establish a non-cooperative multi-user underwater acoustic communication system model based on self-interference cancellation. The effects of step size factor and filter order on the performance of self-interference cancellation are analyzed, and the elimination of self-interference, multi-access interference and inter-symbol interference are considered synthetically. A multiuser detection scheme for SIC-VT based on variable step size and variable order self-interference cancellation is proposed. At the same time, a joint adaptive merging and variable tap length SIC-JACVT multiuser detection scheme based on self-interference cancellation is proposed in full duplex cooperation mode. The influence factors of self-interference cancellation are analyzed by simulation, and the performance advantages of multi-user detection scheme with variable step size and variable order are proved.
【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】：2017
【分類號(hào)】：TN929.3

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本文編號(hào)：1564461