Design And Implementation Of Downlink Baseband Board For LTE-A Air Interface Monitoring Analyzer

With the development of the “13th Five-Year Plan”,the development of the domestic intelligent manufacturing industry has achieved remarkable results,and the key technical equipment represented by intelligent instruments and meters has made positive progress.Compared with foreign air interface monitors and other related products,the LTE-A air interface monitoring analyzer developed by this project reduces the size and power consumption of the equipment,and promotes the development of the domestic instrument industry.In the LTE-A air interface monitoring analyzer,the baseband board is responsible for receiving and storing the baseband data,completing the processing of the downlink L1 layer data,and transmitting the data to the layer 2 processing board.This thesis aims to design and implement a baseband board that can be applied in the LTE-A air interface monitoring analyzer.The research mainly includes the following aspects:1.Requirements analysis and architecture design of baseband board.The overall architecture of the LTE-A air interface monitoring analyze r is proposed.Combined with the characteristics of LTE-A,the function of the LTE-A air interface monitoring analyzer,the communication process between the baseband board and the upper or lower boards,the functional requirements,technical indicators of the baseband board and hardware requirements are analyzed.Based on the requirements analysis,the overall design architecture of the baseband board is proposed.2.Analysis of baseband board storage and bus capabilities and module design,focusing on FPGA implementation of the MIMO detection module.In order to determine the FPGA chip selection,the LTE-A processing capability and I/O pin requirements are analyzed.The storage and bus capabilities of the LTE-A baseband board are analyzed.The MIMO detection module design is focused,and combining the matrix decomposition and the triangular array inversion by means of full-flow water is proposed,which saves the resource consumption caused by the control and storage of the intermediate process.The XPE is used to estimate the overall power consumption of the FPGA and avoid the cause.Excessive power consumption in the FPGA causes damage to the board.3.Combined with signal integrity theory,PCB design for baseband boards.The baseband board stacking structure is designed and the line width of each signal layer is calculated by using Polar Si9000.The baseband board layout is designed considering the physical position of each device and the distribution of high and low frequency components;combined with reflection,crosstalk,SSN in signal integrity.EMC,PI and other issues,design the board layer wiring,and complete the power plane segmentation.The function and stability test of each module of the baseband board shows that the power module and the crystal detection module,the PCIE communication module,the SD card function module,the DDR3 storage module and the MSATA read/write module are all tested;in the stability test,it is verified that the baseband board can continue to work stably at normal temperature and 55 °C.The implementation of the baseband board promotes the development of the LTE-A air interface monitoring analyzer.