Research On Resource-Demapping Of Downlink Physical Channels For TD-LTE Using FPGA

With the strong demand for the development of wireless communication technology and the intense competition of three domestic operators, 3GPP Organization officially launched the LTE(long term evolution) project. In the TD-LTE system,resource demapping is a key technique in signal receiving correctly, terminal decoding and the whole system high performance. TD-LTE system adopts the flexible frame structure configuration, variable bandwidth of the system, a two-dimensional structure of time frequency resource block, while using multiple access mode based on OFDM technology. But it also improves the difficult that terminal take signal from the frame structure on each physical channel and separate the data of each channel, so research on the TD-LTE downlink resources demapping technology is necessary.Designed a stable and high performance solution for resource demapping scheme:Firstly, Introduced five physical channels and signals of physical layer downlink of R10 protocol in LTE, illustrated the concept of frame structure, the time slot structure and physical resources in physical layer,The general process of physical layer downlink channel processing are given.Secondly,illustrated five channels resource demapping algorithm, and the five physical channels mapping algorithm using Matlab simulation, the position of each channel is calculated, and the extraction of all the data of five channels in a subframe.Then, test the whole demapping module of reliability and stability.Finally, according to the resource demapping scheme gave the implementation scheme of FPGA. The simulation process module is divided into five parts: PBCH resources demapping module, PCFICH resources demapping module, PDCCH resources demapping module,PDSCH resources demapping module and PHICH resources demapping module, five channels information were extracted, and the simulation results are analyzed.Then separately for each channel simulation module, and analyze the simulation results.