Multiplexer Design And Implementation Of Next Generation Broadcasting Wireless System

With the rapid development of information technology, the integration of telecommunications networks, broadcasting networks and Internet has become an inevitable trend in the future. Next Generation Broadcast Network(NGB) SARFT of China is building is a standard of broadcasting to use in the “triple play”, and it is based on current technologies. As an important part of NGB, object of Next Generation Broadcast Network Wireless System(NGB-W) make effective use of the original broadcasting spectrum resources to build a new broadcast television network.Data stream inputting NGB-W system may come from a lot of data sources, and transmission of all kinds of data stream may also be different. So NGB-W system requires a multiplexer to transmite different input stream in the physical channel of NGB-W, which can improve the transmission efficiency of the whole system. In this thesis, a design scheme and corresponding implementation of multiplexer which is suitable for NGB-W system are presented. The thesis discusses the design and implementation of the multiplexer.1) Through studying the functional requirements of NGB-W system, a design method of multiplexer which is suitable for NGB-W system is presented. The workflow of the multiplexer in the scheme is as follow. First, technology of physical layer pipe is used to map multi input data to different PLP. Then fixed time slice is allocated to complete multiplexer of PLPs. Finally time division multiplexing is used to complete transmission of data and signaling. According to the workflow of the multiplexer, it is divided into two parts: mode adaptation module and stream adaptation module. Mode adaptation module is used to implement function of transport stream mapping, null package deletion, NGBW-MI framing and baseband frame header insertion and so on. Stream adaptation is used to implement function of frame resource calculation, L1 signalling generation and scrambling and so on. Finally, the Matlab is used to simulate the design of the multiplexer, and the maximum transmission rate is determined in various working modes.2) Refer to the design solutions, implementation of the NGB-W multiplexer which supports two channels of transport stream input is presented.The hardware platform consists of FPGA and the corresponding peripheral circuit.First implementation of transmission data interface and system parameters interface are determined. Then implementation architecture of NGB-W multiplexer is discussed in FPGA, and each functional module is divided, and implementation of each module is determined. The scheduler module is implemented by Nios?soft-core processor that Altera provided, the remaining modules are implemented by Verilog HDL. Finally, platform of the system simulation and platform of FPGA verification are designed, which are used to simulate and verify RTL of multiplexer.NGB-W that is designed and implemented in the thesis completes system simulation and FPGA verification, and has correct functions and stable operation in FPGA hardware platform. The highest operating frequency of the multiplexer can reach 184 MHz. The multiplexer can meet the requirements of NGB-W system, and can be used to the current NGB-W system.