發(fā)布時間：2018-06-21 00:51

  本文選題：同頻同時全雙工 + 天線抵消�。� 參考：《哈爾濱工業(yè)大學(xué)》2014年碩士論文

【摘要】：在無線通信領(lǐng)域,頻譜是極其寶貴的資源,隨著無線通信技術(shù)的發(fā)展,無線接入的總量成指數(shù)型增長,頻譜資源越來越捉襟見肘。在一定頻譜資源內(nèi),一個節(jié)點內(nèi)能夠接入更多的用戶和能夠滿足每個用戶更高的連接速度是我們追求的目標。而傳統(tǒng)的雙工方式和現(xiàn)行的頻分雙工、時分雙工,都是以犧牲效率或者頻譜為代價的,而不能完成真正意義的全雙工。在學(xué)術(shù)界研究者們長期認為:在同一頻帶內(nèi),一個節(jié)點不能同時完成發(fā)送信號和接收信號,因為此節(jié)點的發(fā)射信號會對接收端造成很強的同頻自干擾。而從近兩三年的研究發(fā)現(xiàn),同頻同時全雙工(Co-frequency Co-time Full Duplex,CCFD)是很有可能實現(xiàn)的。因此,本文研究了同頻同時全雙工的通信方式,它能實現(xiàn)在同一頻帶內(nèi),一個節(jié)點能夠同時進行發(fā)送信號和接收信號。并采用了天線干擾抵消、模擬干擾抵消和數(shù)字干擾抵消等多層次聯(lián)合干擾消除的體系架構(gòu),來完成對本地同頻自干擾的抵消,從而實現(xiàn)對頻譜資源的更高效的利用。本文首先研究了CCFD技術(shù)對現(xiàn)有技術(shù)的優(yōu)勢及其實現(xiàn)的關(guān)鍵問題和難點:抵消本地同頻自干擾,并研究了本地同頻自干擾經(jīng)過收發(fā)機元件和無線信道的成分變化。本文研究了三天線實現(xiàn)天線抵消的技術(shù),同時引入兩路信號幅度不匹配和天線RX放置誤差來表示工程中的誤差對三天線抵消性能的影響,并通過仿真給出其誤差對性能影響。為了進一步降低本地自干擾信號功率,本文還研究了模擬抵消的技術(shù)。采用一種類似于sinc差值的模擬抵消方法,利用本地模擬信號,構(gòu)建N路等時延間隔的信號,在接收端通過控制接收信號功率最小來調(diào)整N路信號的衰減系數(shù),將N路信號合成與自干擾抵消。為了充分抵消本地自干擾信號,本文最后研究了非線性數(shù)字干擾抵消算法。首先,對本地自干擾線性成分進行分析并建模,對其非線性部分分析并建模為泰勒級數(shù),發(fā)現(xiàn)其偶次高階項可以忽略。通過把PA功率放大器建模為并聯(lián)漢默斯坦模型,并對天線抵消、數(shù)字抵消建模成FIR濾波器,完成基帶非線性自干擾信道建模,得到自干擾信號。利用本地數(shù)字基帶信號構(gòu)造非線性變換矩陣,在數(shù)字接收端控制接收信號功率最小,利用最小二乘估計出變換矩陣系數(shù),將構(gòu)造的信號與自干擾合成完成抵消。最后對上述方法進行了實驗仿真,并分析了仿真結(jié)果。
[Abstract]:In the field of wireless communication, the spectrum is an extremely valuable resource. With the development of wireless communication technology, the total amount of wireless access has increased exponentially, and the spectrum resources are increasingly stretched. In a certain spectrum resource, it is our goal to be able to access more users within a node and to meet the higher connection speed of each user. The traditional duplex mode and the current frequency division duplex and time division duplex are all at the expense of efficiency or spectrum but can not complete the true meaning of full duplex. Researchers in academic circles have long believed that in the same frequency band, a node can not complete the transmission signal and receive signal simultaneously, because the transmitted signal of this node will cause strong co-frequency self-interference to the receiver. In the past two or three years, it has been found that co-frequency Co-time full Duplex CCFDs are very possible. Therefore, this paper studies the communication mode of simultaneous full duplex in the same frequency band. It can be realized in the same frequency band, and a node can transmit and receive signals at the same time. The multi-level joint interference cancellation architecture such as antenna interference cancellation, analog interference cancellation and digital interference cancellation is adopted to cancel the local co-frequency self-interference, so as to achieve more efficient use of spectrum resources. This paper first studies the advantages of CCFD technology to the existing technology and the key problems and difficulties in its implementation: canceling local co-frequency self-interference, and studying the component changes of local co-frequency self-interference through transceiver components and wireless channels. In this paper, the technique of antenna canceling by three antennas is studied. At the same time, two signal amplitude mismatches and antenna RX placement errors are introduced to express the effect of the errors on the performance of the three antennas, and the effects of the errors on the performance are given by simulation. In order to further reduce the local self-interference signal power, this paper also studies the technology of analog cancellation. An analog cancellation method similar to sinc difference is used to construct N-channel signal with equal delay interval by using local analog signal. The attenuation coefficient of N-channel signal is adjusted by controlling the minimum power of received signal at the receiving end. N-path signal synthesis and self-interference cancellation. In order to fully cancel the local self-interference signal, the nonlinear digital interference cancellation algorithm is studied in this paper. Firstly, the local self-disturbance linear component is analyzed and modeled, and the nonlinear part is modeled as Taylor series. It is found that the even order higher order term can be neglected. The PA power amplifier is modeled as a parallel Hammerstein model, and the antenna cancellations and digital cancellations are modeled as Fir filters to model the baseband nonlinear self-interference channels and obtain the self-interference signals. The local digital baseband signal is used to construct the nonlinear transformation matrix, the power of the received signal is minimized at the digital receiver, the coefficient of the transformation matrix is estimated by the least square method, and the constructed signal is offset by the self-interference synthesis. Finally, the simulation results of the above methods are analyzed.
【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】：2014
【分類號】：TN929.5

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