本文關(guān)鍵詞： 同頻同時(shí)全雙工 天線抵消 模擬抵消 數(shù)字抵消 MIMO LTE　出處：《哈爾濱工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：在無(wú)線通信領(lǐng)域,頻譜是極其寶貴的資源,然而現(xiàn)行的LTE系統(tǒng),不是采用頻分雙工就是采用時(shí)分雙工的方式,無(wú)論哪一種雙工方式都不能實(shí)現(xiàn)在同一頻帶內(nèi)同時(shí)發(fā)送并接收信號(hào),這樣就造成了一半無(wú)線頻譜資源的浪費(fèi)。直到同頻同時(shí)全雙工技術(shù)的出現(xiàn)才實(shí)現(xiàn)真正意義上的全雙工通信,然而最近研究發(fā)現(xiàn)基于SISO的全雙工通信是可以實(shí)現(xiàn)的,因此本文主要研究全雙工技術(shù)應(yīng)用到基于MIMO-LTE系統(tǒng)中,實(shí)現(xiàn)基于MIMO-LTE的全雙工系統(tǒng)。然而實(shí)現(xiàn)該系統(tǒng)的主要技術(shù)難點(diǎn)是:(1)消除本地同頻干擾信號(hào);(2)抵消性能受帶寬影響;(3)為了動(dòng)態(tài)抵消而調(diào)節(jié)消擾電路的時(shí)間太長(zhǎng)。為了解決上述技術(shù)難點(diǎn)本文首先分析了干擾信號(hào)的各個(gè)成份,然后通過(guò)設(shè)計(jì)具體解決方案將干擾信號(hào)的各個(gè)成份都降到可接受的噪聲基底范圍內(nèi)。因此,本文在抵消同頻自干擾信號(hào)時(shí)采用了天線抵消、模擬抵消和數(shù)字抵消等多層次聯(lián)合干擾消除的體系架構(gòu),在抵消同頻互干擾信號(hào)時(shí)采用再次使用基于自干擾信號(hào)的抵消系統(tǒng),并通過(guò)級(jí)聯(lián)傳輸函數(shù)的方式。最終實(shí)現(xiàn)基于MIMO-LTE的全雙工系統(tǒng)。本文天線抵消采用的是含有新型環(huán)形隔離器的收發(fā)同體的天線抵消方式,該方式能夠抵消20 dB左右。模擬抵消采用的是N路射頻信號(hào)通過(guò)固定延時(shí)器和可編程衰減器后合成一路信號(hào),與自干擾信號(hào)對(duì)消的方式,其中,可編程衰減器系數(shù)采用多維梯度下降算法來(lái)計(jì)算出來(lái),模擬抵消最高能夠抵消50 d B左右。由于干擾信號(hào)中包含非線性成份和傳輸噪聲,因此本文又提出了一種新的數(shù)字抵消結(jié)構(gòu),通過(guò)采用包含非線性成份和傳輸噪聲的數(shù)字基帶信號(hào)通過(guò)線性數(shù)字抵消的方式,來(lái)進(jìn)一步的抵消自干擾信號(hào)。該方式能夠抵消44 d B左右。本文又研究了兩種互干擾信號(hào)的模擬抵消算法,一種是傳統(tǒng)方式的給每個(gè)干擾鏈路都復(fù)制自干擾信號(hào)的模擬抵消系統(tǒng)。另一種是本文所提出的通過(guò)再次使用自干擾信號(hào)的模擬抵消系統(tǒng),并通過(guò)級(jí)聯(lián)傳輸函數(shù)的方式。在達(dá)到相同的抵消性能的情況下,本文所提出的模擬抵消算法,所使用的總的延時(shí)線(包含一個(gè)固定延時(shí)器和一個(gè)可編程的衰減器)的數(shù)量比傳統(tǒng)的方法要少很多。采用本文提出的互干擾信號(hào)的模擬抵消算法,可以減少調(diào)節(jié)模擬抵消系統(tǒng)的時(shí)間。
[Abstract]:In the field of wireless communication, the spectrum is an extremely valuable resource. However, the current LTE systems either use frequency division duplex or time division duplex. Neither duplex mode can transmit and receive signals simultaneously in the same frequency band, which results in the waste of half of the wireless spectrum resources. It is not until the emergence of the same frequency and simultaneous full duplex technology that the true full-duplex communication is realized. However, recent studies have found that full-duplex communication based on SISO can be realized, so this paper mainly studies the application of full-duplex technology to MIMO-LTE based systems. A full-duplex system based on MIMO-LTE is implemented. However, the main technical difficulty in realizing the system is: 1) eliminating the local co-frequency interference signal / / 2) canceling performance is affected by the bandwidth) the time of adjusting the disturbance cancellation circuit for dynamic cancellation is too long. To solve the above technical difficulties, this paper first analyzes the various components of the interference signal. Then, through the design of specific solutions, all components of the interference signal are reduced to the acceptable noise base range. Therefore, in this paper, the antenna is used to cancel the same frequency self-interference signal. The architecture of multi-level joint interference cancellation, such as analog cancellation and digital cancellation, is based on self-interference signal again when cancelling the same frequency mutual interference signal. Finally, the full-duplex system based on MIMO-LTE is realized by cascading transfer function. This method can cancel about 20 dB. The analog cancellation uses the N channel radio frequency signal which is synthesized by fixed delay device and programmable attenuator to cancel the self interference signal. The programmable attenuator coefficient is calculated by the multi-dimensional gradient descent algorithm. The simulated cancellation can cancel the maximum of 50 dB. Because the interference signal contains nonlinear components and transmission noise, In this paper, a new digital cancellation structure is proposed, in which the linear digital cancellation is achieved by using a digital baseband signal containing nonlinear components and transmitting noise. This method can cancel 44 dB or so. In this paper, two kinds of analog cancellation algorithms for mutual interference signals are studied. One is the traditional analog cancellation system that copies the self-interference signal for each interference link, the other is the analog cancellation system proposed in this paper by re-using the self-interference signal. In the case of the same cancellation performance, the simulated cancellation algorithm proposed in this paper is based on cascading transfer functions. The total number of delay lines used (including a fixed delay device and a programmable attenuator) is much smaller than the traditional method. It reduces the time required to adjust the analog counteracting system.
【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】：2015
【分類號(hào)】：TN919.3

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