Design And Implementation Of LTE-Advanced Physical Layer Downlink Data Shared Channelin In Terminal Testing Instrument

With the rapid development of wireless communication technology and popularization, LTE-Advanced related industry chain ushered in the vast number of development opportunities. As an important part of the entire communications industry chain, communication measurement instruments plays an important role in the terminal production. The research is derived from the project of the next generation LTE-A terminal testing instrument of a domestic communications technology company.Based on the study of LTE-Advanced physical layer downlink technology and physical layer downlink data shared channel, the design of the scheme, code compilation and test verification flow are realized by combining the hardware platform function characteristics. This thesis realizes the design and implementation of the LTE-Advanced physical layer downlink data sharing channel in the terminal test instrument.Firstly, this thesis summarizes the technical background and significance of the topic selection, and discusses the LTE-Advanced physical layer technology,especially the physical downlink data shared channel. Combined with the new generation of test instrument platform hardware and software architecture. By studying the hardware characteristics of the platform, this thesis lays the foundation for the next step of the design.Secondly, the downlink data shared channel function is divided into two module design and implementation, namely bit-level processing module and resource mapping processing module. Bit-level processing module gives the design scheme of CRC attachment, Turbo encoding and rate matching for the transmission block, and carries out single-core verification and time-consuming comparison analysis. The resource mapping module provides synchronization signal and reference signal generation mapping, layer mapping, precoding,resource mapping and time domain signal generation design scheme, and performs single-core verification and time-consuming optimization under large data volume and analysis. And then design test cases to verify the design module in the test instrument is correct.Finally, this thesis summarizes the implementation procedures, and prospects the future of communication measuring instruments.