【摘要】：TD-LTE屬于第四代移動通信中的主流技術(shù)之一。3GPP組織進(jìn)行了可行性研究和標(biāo)準(zhǔn)化工作,LTE已經(jīng)得到了全球設(shè)備制造商和運(yùn)營商最廣泛的參與和支持。MIMO(多輸入多輸出)和OFDM(正交頻分復(fù)用)技術(shù)是LTE系統(tǒng)兩項(xiàng)關(guān)鍵技術(shù)。TD-LTE系統(tǒng)廣播沿用了傳統(tǒng)系統(tǒng)廣播的設(shè)計(jì)思想,系統(tǒng)廣播信息是為了保證UE可以正常地接入駐留的小區(qū)并為其服務(wù),同時提供了接入小區(qū)網(wǎng)絡(luò)的必要信道信息和空閑狀態(tài)下的移動管理。按照廣播信息的重要程度和不同的傳輸方式,系統(tǒng)信息包括主信息塊和系統(tǒng)信息塊。本文研究主信息塊,其包括的信息有物理混合自動重傳指示信道信息、小區(qū)帶寬、系統(tǒng)幀號等小區(qū)最基本信息。本文對LTE系統(tǒng)中的物理廣播信道信息提取和咬尾卷積譯碼算法進(jìn)行了研究。研究了物理廣播信道發(fā)送端和接收端的模塊,包括:小區(qū)加解擾、速率匹配和解速率匹配、咬尾卷積編譯碼、CRC加解擾和CRC校驗(yàn),對每個模塊編寫了MATLAB代碼,進(jìn)行了仿真驗(yàn)證;用FPGA編程實(shí)現(xiàn)了接收端的下行物理廣播信道提取過程;研究了Viterbi譯碼算法,提出了一種改進(jìn)的咬尾卷積譯碼算法——正逆序結(jié)合譯碼算法。通過MATLAB對物理廣播信道的發(fā)送端和接收端進(jìn)行了聯(lián)合仿真,仿真結(jié)果驗(yàn)證了正確性;用FPGA實(shí)現(xiàn)了接收端的物理廣播信道提取過程,并通過和MATLAB輸入輸出的數(shù)據(jù)比較,驗(yàn)證了其正確性可以應(yīng)用到LTE系統(tǒng)的接收端;對改進(jìn)的算法和現(xiàn)有算法進(jìn)行了MATLAB仿真對比,改進(jìn)的算法可以降低系統(tǒng)誤碼率,適用于LTE系統(tǒng)用于咬尾卷積譯碼。
[Abstract]:TD-LTE is one of the mainstream technologies in the fourth generation mobile communication. 3GPP organization has carried out feasibility study and standardization work. LTE has gained the most extensive participation and support for. MIMO (multiple input and multiple output (. MIMO () and OFDM (orthogonal Frequency Division Multiplexing) technology, which is the two key technologies in LTE system. The broadcast of TD-LTE system continues to be transmitted. The design idea of system broadcasting, The system broadcast information is to ensure that the UE can access and serve the resident cell normally, at the same time, it provides the necessary channel information and mobile management in the idle state to access the cell network. According to the importance of broadcast information and different transmission modes, the system information includes main information block and system information block. In this paper, the main information block is studied, which includes the basic information of the cell such as the physical mixing automatic retransmission indication channel information, the cell bandwidth, the system frame number, and so on. In this paper, the information extraction and bitting convolution decoding algorithm of physical broadcast channel in LTE system are studied. The modules of physical broadcast channel transmitter and receiver are studied, including cell descrambling, rate matching and descrambling, bitting convolution encoding and decoding, CRC scrambling and CRC verification. MATLAB codes are written for each module and verified by simulation. The extraction process of downlink physical broadcast channel in receiver is realized by FPGA programming, and the Viterbi decoding algorithm is studied, and an improved decoding algorithm named forward and inverse convolutional decoding algorithm is proposed. The joint simulation of the transmitter and receiver of the physical broadcast channel is carried out by MATLAB, and the simulation results verify the correctness of the simulation. The physical broadcast channel extraction process of the receiver is realized by using FPGA, and compared with the data of MATLAB input and output, the correctness of this method can be applied to the receiver of LTE system. The improved algorithm is compared with the existing algorithm by MATLAB simulation. The improved algorithm can reduce the bit error rate of the system and is suitable for the bit-biting convolutional decoding of LTE system.
【學(xué)位授予單位】：河北工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN929.5;TN791

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