Research And Implementation Of The LTE-A Downlink In The DSP

In recent years,with the development of wireless communication technology and network technology,smart terminals such as mobile phones,tablet PCs and smart watches have been rapidly popularized.The user is "blowout",which makes the requirement of the transmission capacity and the speed of upload/download in the mobile communication system higher and higher.In order to deal with the challenge from the new communication technology and the growth of the market needs,3GPP organization started a research on the LTE-A project.As the next version of LTE,LTE-A gained significant breakthrough in greater transmission capacity,faster peak rate and better system performance.So it has become an important turning point in the development of the mobile communication.Based on the 3GPP physical layer protocol,the basic concepts of LTE-A system are introduced.Firstly,the network architecture,system frame structure and the key new technologies of physical layer in LTE-A system have been introduced,which prove that the LTE-A system has better performance than the traditional technology.Then,the transmission channels of the physical layer in the system are briefly described.And their structure and function are analyzed.It focuses on the analysis of structure and function,and makes an in-depth study on the whole process of data transmission in each channel.What is more,according to the MATLAB simulation of a data access,the access process of physical layer downlink data is analyzed in detail.The specific process of the establishing connection between the terminal and the network terminal is described.Secondly,the downlink PDSCH which is responsible for large amounts of transmitting data has been introduced,while the data processing steps in the PDSCH channel is described.Meanwhile,a set of PDSCH receiving scheme is designed at the receiving end.In this scheme,the LS algorithm combines with the linear interpolation is used for the channel estimation,and the QR decomposition algorithm is used for signal detection.In addition,the functions and algorithm of each module are discussed.Finally,according to the research demanding of the key national project “the development of test equipment of TD-LTE-A system” and the institution cooperative project “LTE-TDD physical layer receiving and implementing technology”,this thesis is based on the research and simulation of the downlink system.The whole downlink data receiving process is realized by DSP chip “TMS320C6455” of TI.According to the simulation results of each module program on the test platform,the feasibility and practicability of the scheme are verified through the analysis of the storage space and time loss.