TD-LTE系统物理广播信道信息提取的研究及FPGA实现

发布时间：2019-01-23 08:26

【摘要】：TD-LTE属于第四代移动通信中的主流技术之一。3GPP组织进行了可行性研究和标准化工作,LTE已经得到了全球设备制造商和运营商最广泛的参与和支持。MIMO(多输入多输出)和OFDM(正交频分复用)技术是LTE系统两项关键技术。TD-LTE系统广播沿用了传统系统广播的设计思想,系统广播信息是为了保证UE可以正常地接入驻留的小区并为其服务,同时提供了接入小区网络的必要信道信息和空闲状态下的移动管理。按照广播信息的重要程度和不同的传输方式,系统信息包括主信息块和系统信息块。本文研究主信息块,其包括的信息有物理混合自动重传指示信道信息、小区带宽、系统帧号等小区最基本信息。本文对LTE系统中的物理广播信道信息提取和咬尾卷积译码算法进行了研究。研究了物理广播信道发送端和接收端的模块,包括:小区加解扰、速率匹配和解速率匹配、咬尾卷积编译码、CRC加解扰和CRC校验,对每个模块编写了MATLAB代码,进行了仿真验证;用FPGA编程实现了接收端的下行物理广播信道提取过程;研究了Viterbi译码算法,提出了一种改进的咬尾卷积译码算法——正逆序结合译码算法。通过MATLAB对物理广播信道的发送端和接收端进行了联合仿真,仿真结果验证了正确性;用FPGA实现了接收端的物理广播信道提取过程,并通过和MATLAB输入输出的数据比较,验证了其正确性可以应用到LTE系统的接收端;对改进的算法和现有算法进行了MATLAB仿真对比,改进的算法可以降低系统误码率,适用于LTE系统用于咬尾卷积译码。
[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.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN929.5;TN791

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