本文選題：分布式數(shù)字中繼 + 底噪聲抑制�。� 參考：《東南大學(xué)》2017年碩士論文

【摘要】：3GPPLTE-A中提出中繼技術(shù)來擴(kuò)展小區(qū)覆蓋面積,將信號提供給那些陰影衰弱嚴(yán)重或者信號很難到達(dá)的地方,為室內(nèi)以及業(yè)務(wù)密集的地方提供覆蓋。中繼技術(shù)能夠擴(kuò)大網(wǎng)絡(luò)覆蓋面積、提高系統(tǒng)容量、增強(qiáng)系統(tǒng)抗衰落性能、增強(qiáng)系統(tǒng)的魯棒性,而且在高速發(fā)展的通信方式下,能夠降低成本,以更節(jié)約資源的方式進(jìn)行網(wǎng)絡(luò)布局建設(shè)。中繼的種類有很多,其中分布式數(shù)字中繼采用一個(gè)近端單元帶多個(gè)遠(yuǎn)端單元的組網(wǎng)方式,近端單元和遠(yuǎn)端單元之間用光纖或電纜連接,與傳統(tǒng)的模擬中繼相比具有遠(yuǎn)距離傳輸衰減小、性能穩(wěn)定、組網(wǎng)方式靈活、監(jiān)控功能完善、信號處理方便、通用性和兼容性強(qiáng)等優(yōu)點(diǎn),因而被廣泛研究和運(yùn)用。然而,分布式數(shù)字中繼的運(yùn)用會使得基站上行底噪聲抬高,從而降低基站靈敏度,本文即研究如何通過數(shù)字信號處理的方式解決該問題。首先,本文基于分布式數(shù)字中繼系統(tǒng)的工作原理,對一個(gè)近端單元帶多個(gè)遠(yuǎn)端單元的組網(wǎng)方式下系統(tǒng)的上行底噪聲做了詳細(xì)的分析。通過推導(dǎo)分析得出,分布式數(shù)字中繼系統(tǒng)中上行底噪聲增量在工程中主要是由遠(yuǎn)端單元的自身噪聲系數(shù)、上行增益和遠(yuǎn)端單元的配置數(shù)目決定。接著本文在LTE系統(tǒng)中,基于3GPP case1下路徑損耗模型分別對傳統(tǒng)模擬中繼和分布式數(shù)字中繼場景進(jìn)行了上行鏈路仿真計(jì)算,仿真結(jié)果表明分布式數(shù)字中繼較傳統(tǒng)模擬中繼鏈路增益效果要好,然而隨著遠(yuǎn)端單元的配置數(shù)目增多時(shí),系統(tǒng)底噪聲將明顯增加,從而影響系統(tǒng)性能。為此,本文基于GSM系統(tǒng)和LTE系統(tǒng),分別提出了相應(yīng)的抑制上行底噪聲的方案設(shè)計(jì)。其基本原理是將接收到的上行信號經(jīng)過濾波處理,得到各用戶頻段的數(shù)字基帶信號,再對濾波后的數(shù)字基帶信號進(jìn)行功率檢測,將檢測的功率值與設(shè)定好的噪聲門限做比較判決,按照一定的判斷規(guī)則,若信號功率足夠小,則將其判定為干擾噪聲,直接置零,達(dá)到消除干擾底噪聲的目的。其次,本文針對提出的GSM系統(tǒng)和LTE系統(tǒng)中分布式數(shù)字中繼上行噪聲抑制方案進(jìn)行了詳細(xì)的設(shè)計(jì)與仿真。先是介紹了 GSM系統(tǒng)和LTE系統(tǒng)上行鏈路信號傳輸?shù)幕A(chǔ)概念,基于MATLAB工具產(chǎn)生GSM和LTE上行鏈路信號;接著對底噪聲抑制模塊中的數(shù)字濾波器組、功率檢測、門限設(shè)置與判別模塊分別逐一做了詳細(xì)的闡述和設(shè)計(jì),并對各個(gè)模塊的性能進(jìn)行了仿真與分析。最終,將上述設(shè)計(jì)分別應(yīng)用到GSM和LTE分布式數(shù)字中繼系統(tǒng)中,通過仿真不同信噪比下系統(tǒng)的誤比特率,比較了采用該底噪聲抑制方案前后系統(tǒng)的性能,仿真結(jié)果表明采用該底噪聲抑制方案后系統(tǒng)的上行噪聲得到了很好的抑制,誤比特率有了很好的改善。最后,本文針對LTE系統(tǒng)底噪聲抑制模塊進(jìn)行了優(yōu)化與性能分析。先是針對噪聲門限的設(shè)置,采用設(shè)置噪聲開啟門限和噪聲關(guān)閉門限兩個(gè)噪聲門限的方法,并且提出了自適應(yīng)噪聲門限的方法,使得噪聲門限的值可以隨著實(shí)時(shí)噪聲功率大小的變化而變化,從而使得噪聲判決更加準(zhǔn)確,減少了截?cái)嗪驼`判誤差,通過誤比特率仿真可以看出噪聲門限優(yōu)化后噪聲抑制模塊可以更準(zhǔn)確的抑制干擾噪聲,系統(tǒng)誤比特率得到了進(jìn)一步改善。接著本文針對底噪聲抑制模塊中的濾波器組進(jìn)行了優(yōu)化,對DFT濾波器組中的原型濾波器進(jìn)行了重新設(shè)計(jì),以減小濾波器組各濾波器之間的重疊,使得濾波效果更好。本文還針對底噪聲抑制模塊的性能進(jìn)行了評估分析,分析了各模塊的延遲對系統(tǒng)帶來的影響,并給出了削弱影響的辦法;并對濾波器組計(jì)算復(fù)雜度進(jìn)行了分析,提出了采用每多個(gè)相鄰的資源塊作為一個(gè)濾波單元的方法來減少濾波器的階數(shù),使得濾波器組中計(jì)算量減少。
[Abstract]:In 3GPPLTE-A, relay technology is proposed to extend the area of cell coverage, providing the signal to places where the shadow is weak or the signal is difficult to reach. It provides coverage for indoor and business intensive places. Relay technology can expand network coverage, improve system capacity, enhance system anti fading performance, and enhance system robustness. In the rapid development of communication mode, the cost can be reduced and the network layout is built in the way of saving resources. There are many kinds of relay. In which the distributed digital relay uses a network mode with a near terminal unit with many remote units, the near end unit and the remote unit are connected by optical fiber or cable, and the traditional mode. The proposed relay is widely studied and applied in comparison with the low attenuation of long distance transmission, stable performance, flexible networking mode, perfect monitoring function, convenient signal processing, versatility and compatibility. However, the application of distributed digital relay will make the base station bottom noise raise and reduce the sensitivity of base station. This paper is to study How to solve this problem by means of digital signal processing. First, based on the working principle of distributed digital relay system, this paper makes a detailed analysis of the upper bottom noise of the system under the networking mode of a near terminal unit with multiple remote units. Through the derivation and analysis, the uplink noise increment in the distributed digital relay system is obtained. In the project, it is mainly determined by the self noise coefficient of the remote unit, the uplink gain and the configuration number of the remote unit. Then, in the LTE system, the uplink simulation of the traditional analog relay and distributed digital relay scene is calculated on the basis of the path loss model under the 3GPP case1, and the simulation results show that the distributed number is in the distributed number. The result is better than the traditional analog relay link. However, with the increase of the configuration number of the remote unit, the noise of the system bottom will be significantly increased, thus affecting the performance of the system. Therefore, based on the GSM system and the LTE system, the corresponding scheme to suppress the uplink noise is proposed. The basic principle is to receive the uplink letter. After filtering, the digital baseband signal of each user frequency band is obtained, and then the power of the digital baseband signal after filtering is detected. The power value of the detection is compared with the set noise threshold. In accordance with certain judgment rules, if the signal power is small enough, it is judged as interference noise and directly zero, so as to eliminate interference. The purpose of bottom noise. Secondly, in this paper, the distributed digital relay uplink noise suppression scheme in GSM and LTE systems is designed and simulated in detail. First, the basic concept of GSM system and LTE system uplink signal transmission is introduced, GSM and LTE uplink signals are generated based on MATLAB tools; and then bottom noise is used. The digital filter bank of the suppression module, the power detection, the threshold setting and the discriminant module are elaborated and designed in detail, and the performance of each module is simulated and analyzed. Finally, the above design is applied to the GSM and LTE distributed digital relay system, by simulating the bit error of the system under the different signal to noise ratio. The performance of the system with the background noise suppression scheme is compared. The simulation results show that the uplink noise of the system is well suppressed after the noise suppression scheme, and the bit error rate has been improved well. Finally, the optimization and performance analysis of the LTE system base noise suppression module are carried out. The method of setting the threshold of noise opening and closing the threshold of noise to close the threshold of two noise threshold is adopted, and a method of adaptive noise threshold is proposed, which makes the value of the noise threshold change with the change of the real time noise power, thus making the noise decision more accurate, reducing the truncation and misjudgment error and by mistake ratio. The special rate simulation shows that the noise suppression module can more accurately suppress the interference noise after the noise threshold optimization, and the system bit error rate has been further improved. Then this paper optimizes the filter banks in the bottom noise suppression module, and redesigns the prototype filter in the DFT filter bank to reduce the filter banks. The overlapping of each filter makes the filtering effect better. In this paper, the performance of the bottom noise suppression module is evaluated and analyzed, the effect of the delay on the system is analyzed, and the method to weaken the influence is given. The complexity of the filter group is analyzed and the use of each adjacent resource block is proposed. As a filter unit, the order of the filter is reduced, and the computation amount in the filter bank is reduced.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN929.5

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