Research And Realization Of The Uplink Technology In TD-LTE Physical Layer Based On All Subframe Configuration

With the Evolution of wireless air interface technology,LTE system is proposed by3 GPP.The TD-LTE is an international standard led by China,its main advantage is that it can increase bandwidth,capacity and peak data rate.It can also reduce transmission delay,operating costs.Moreover,it can coexist with existing network.As the underlying in LTE system,the physical layer is always the focus of mobile communication technology's research.This thesis introduces the basic principles of the uplink in physical layer,then it studies some key technologies and important algorithms in the physical layer,at last,realization has been made in the DSP platform.Firstly,the thesis describes the TD-LTE uplink protocol framework and link structure,and it has a further study and discussion about the frame structure,slot structure,the reference signal and the multiple access technology.Then the processing of PUSCH is introduced briefly.Secondly,this thesis studies several common tail-biting convolutional code decoding algorithms in the TD-LTE system,and then proposes an improved code decoding algorithm,decoding simulation results for code block with different length is achieved from the simulation platform.Form the changes on the performance of the improved algorithm brought in,we can see that the improved algorithm has better performance on BER and lower decoding complexity.Finally,this thesis designs the channel processing sequence of the core,including software architecture and the timing issues of the channel processing.It mainly analyze the timing relationship between the PUSCH,SRS,PUCCH,PRACH and measurement process in channel processing,and it presents a design about the channel processing of the core to meet all subframe configuration requirements.SPS and TTI Bundling unit module is added in the original code and Freescale's MSC8157 processor is used to realize the uplink receiving at the end of station.