本文選題：MISO + SWIPT��； 參考：《哈爾濱工業(yè)大學(xué)》2017年碩士論文

【摘要】：隨著科學(xué)技術(shù)的迅猛發(fā)展,小功率的移動通訊設(shè)備隨處可見,這使得人們對電池便捷充電的需求越來越高。傳統(tǒng)的電能傳輸是通過導(dǎo)線實現(xiàn)的,充電環(huán)境具有局限性,比如醫(yī)用植入環(huán)境中有線充電就極為不方便。因此,無線充電技術(shù)在智能家居,醫(yī)療器械等領(lǐng)域有著廣泛的應(yīng)用前景。以射頻信號作為介質(zhì)的無線通信系統(tǒng)既可以進行無線信息傳輸,也可以進行無線電能傳輸。我們把有此雙重功能的通信系統(tǒng)叫做無線信息與能量同傳系統(tǒng),即SWIPT(Simultaneous Wireless Information and Power Transfer)系統(tǒng)。由于自由空間的功率耗散嚴重以及能量接收機的能量轉(zhuǎn)換電路轉(zhuǎn)換效率較低,為了使能量接收機能夠達到基本能量需求,基站必須具有較大的發(fā)送功率。本文主要針對能量接收機電能收集量低以及用戶對基站發(fā)送功率要求高的問題,提出了兩種有效的解決方案。首先,針對用戶間干擾未得到合理利用的問題,本文提出了一種基于SWIPT系統(tǒng)的聯(lián)合波束形成設(shè)計,該設(shè)計將單一的波束形成向量延伸到兩個獨立的波束形成向量,進而實現(xiàn)信息和能量的獨立控制。該設(shè)計一方面可以實現(xiàn)信息的定向傳輸,另一方面可以擴展能量的來源。本文針對MISO廣播系統(tǒng)下的聯(lián)合波束形成設(shè)計進行了理論分析與軟件仿真,并與常規(guī)波束形成和迫零波束形成設(shè)計進行了對比。仿真結(jié)果表明,該設(shè)計能夠通過收集用戶間干擾作為電能的來源,從而達到在同等電能收集量的情況下,有效地減小基站的發(fā)送功率。其次,針對能量接收機電能收集量低的問題,本文提出了一種基于最大化電能收集量的人工噪聲設(shè)計方法。在該設(shè)計下,基站發(fā)送的信號中同時含有信息波束和人工噪聲,一方面人工噪聲可以作為電能的來源,從而提高電能收集量。另一方面人工噪聲也可以對系統(tǒng)中潛在的竊聽用戶產(chǎn)生干擾,從而實現(xiàn)安全通信。本文針對MISO廣播系統(tǒng)下的人工噪聲設(shè)計進行了理論分析與軟件仿真,并與未加人工噪聲的網(wǎng)絡(luò)進行了對比。仿真結(jié)果表明,該設(shè)計能夠增加能量接收機的電能收集量,并且實現(xiàn)信息的保密傳輸。綜上所述,本文針對以上兩種可以有效提高電能收集量的方法進行了深入的研究,在研究過程中,我們?nèi)〉昧艘恍┲档脜⒖嫉某晒?同時新方法的提出又拓寬了SWIPT技術(shù)的研究方向。
[Abstract]:With the rapid development of science and technology, low power mobile communication devices can be seen everywhere. Traditional electric power transmission is realized by wire, and the charging environment is limited. For example, wired charging in medical implant environment is very inconvenient. Therefore, wireless charging technology in smart home, medical devices and other fields have a wide range of applications. Radio-frequency communication system can transmit both wireless information and radio energy. The communication system with this dual function is called wireless information and energy simultaneous interpretation system (SWIPT). Because of the serious power dissipation in the free space and the low efficiency of the energy conversion circuit of the energy receiver, in order to make the energy receiver meet the basic energy demand, the base station must have a large transmission power. In this paper, two effective solutions are proposed to solve the problems of low energy collection and high demand for base station transmission power. Firstly, a joint beamforming design based on SWIPT is proposed, which extends a single beamforming vector to two independent beamforming vectors. Then realize the independent control of information and energy. On the one hand, the design can realize the directional transmission of information, on the other hand, it can expand the source of energy. In this paper, theoretical analysis and software simulation of joint beamforming design in miso broadcasting system are carried out, and compared with conventional beamforming and zero-forcing beamforming designs. The simulation results show that the design can effectively reduce the transmission power of the base station by collecting interuser interference as the source of electric energy and achieving the same amount of power collection. Secondly, aiming at the problem of low energy collection in energy receiver, this paper proposes a design method of artificial noise based on maximization of energy collection. In this design, the signal sent by the base station contains both information beam and artificial noise. On the one hand, the artificial noise can be used as the source of electric energy, thus increasing the amount of power collection. On the other hand, the artificial noise can interfere with the potential eavesdropping users in the system, so as to achieve secure communication. In this paper, the design of artificial noise in miso broadcasting system is analyzed theoretically and simulated by software, and compared with the network without artificial noise. The simulation results show that the design can increase the power collection of the energy receiver and realize the secure transmission of information. To sum up, the two methods mentioned above can effectively increase the amount of electric energy collection. In the course of the research, we have achieved some valuable results. At the same time, the new method broadens the research direction of SWIPT technology.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN92

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本文編號：2079674