【摘要】：無線攜能通信是通信技術(shù)與輸電技術(shù)交叉融合的一個前沿方向,利用相同的頻譜并行傳輸信息與能量,從而充分利用寶貴的能量資源和頻率資源。近年來,以無線電波作為媒介的攜能通信研究十分火熱,而以超聲波作為媒介的方式卻沒有得到足夠關(guān)注。由于超聲波方向性好,穿透能力強,能量集中,無電磁干擾,對人體危害小,超聲波無線攜能通信在生物醫(yī)學(xué)領(lǐng)域、深海等惡劣環(huán)境中具有廣泛的應(yīng)用前景,特別適用于植入式醫(yī)療器械以及水下傳感網(wǎng)等。因此,超聲波無線攜能通信具有重要的研究意義和實用價值。本論文首先從超聲波的通信機制出發(fā),結(jié)合聲波特性,研究了超聲波通信的調(diào)制方式及信道特性,分析了多徑衰落、多普勒頻移、混響、背景噪聲等問題。然后從超聲波換能器基礎(chǔ)出發(fā),研究了力學(xué)聲學(xué)混合類比電路及其在幾種常用電聲換能器研究中的應(yīng)用,分析并提出了超聲波換能器的設(shè)計要求及設(shè)計方法。最后基于以上兩點,本論文給出了超聲波無線攜能通信系統(tǒng)的架構(gòu)設(shè)計,提出了分離式接收機和一體式接收機兩種攜能接收機架構(gòu),在一體式接收機架構(gòu)中提出了能量調(diào)制。研究了動態(tài)功率分配機制的三個特例,分別為時間切換、靜態(tài)功率分配以及開關(guān)功率分配,建立了速率-能量折衷模型,并用速率-能量區(qū)域表征兩類接收機的系統(tǒng)性能。通過改變信道參數(shù),研究了通信速率、輸出功率、誤碼率等關(guān)鍵性能指標(biāo)。結(jié)果表明:在大部分情況下,一體式接收機性能優(yōu)于分離式接收機;在接收機功耗無法忽略的現(xiàn)實情形下,開關(guān)功率分配是兩類接收機的最佳性能折衷策略。
[Abstract]:Wireless energy carrying communication is a forward direction of communication technology and transmission technology. It uses the same spectrum to transmit information and energy in parallel so as to make full use of valuable energy and frequency resources. In recent years, the research of portable communication with radio wave as the medium is very hot, but the way of using ultrasonic wave as the medium has not received enough attention. Because of its good directionality, strong penetrating ability, concentrated energy, no electromagnetic interference, and less harm to human body, ultrasonic wireless energy carrying communication has a wide application prospect in biomedical field, deep sea and other adverse environments. It is especially suitable for implantable medical devices and underwater sensor networks. Therefore, ultrasonic wireless portable communication has important research significance and practical value. Based on the communication mechanism of ultrasonic wave and the characteristics of acoustic wave, the modulation mode and channel characteristics of ultrasonic communication are studied in this paper, and the problems of multipath fading, Doppler frequency shift, reverberation and background noise are analyzed. Then, based on the ultrasonic transducer, the mixed analogy circuit of mechanical acoustics and its application in several kinds of electroacoustic transducers are studied. The design requirements and design methods of ultrasonic transducer are analyzed and put forward. Finally, based on the above two points, this paper gives the architecture design of the ultrasonic wireless portable communication system, proposes two kinds of energy carrying receiver architecture: the separate receiver and the integrated receiver, and proposes the energy modulation in the integrated receiver architecture. In this paper, three special cases of dynamic power allocation, namely time switching, static power allocation and switching power allocation, are studied. A rate-energy eclectic model is established, and the system performance of two kinds of receivers is characterized by rate-energy region. By changing the channel parameters, the key performance indexes such as communication rate, output power and bit error rate are studied. The results show that, in most cases, the performance of integrated receiver is better than that of separate receiver, and the switching power allocation is the best performance compromise strategy for the two types of receivers when the power consumption of receiver can not be ignored.
【學(xué)位授予單位】：南京郵電大學(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：2154431