Lte Uplink Waveform Design And Software Define Radio Implementation

The age of multi-frequency and multi-mode smart phones which requires to support LTE mode on the basis of 2G and 3G mode and realizes international roaming is coming. And the number of total frequency bands is close to 40. Manufacturers need to design many different hardware platforms to support so many different criterias and frequencies, so it not only leads to manufacturers facing great pressure, but also make the product development cycle time delays, design cost and maintenance cost increases. Since the software defined radio technology has the advantages of reconfiguration and programmability, it is widely used to realize quick development and verification by many equipment manufacturers reduce the cost.Therefore,this paper studies key techniques of the LTE uplink and completes the demonstration and verification, based on the uSDR platform independently developed by our laboratory. Major work in this paper is as follows:Firstly, key techniques of the LTE uplink waveform is investigated, included the LTE physical frame structure, reference signal and channel estimation and equalization, etc. According to the functional requirements and performance requirements of the project, the designing and implementation of LTE uplink waveform are given: transmitter modes uses CRC encoding, Turbo coding, scrambling, 16 QAM modulation, SC-FDMA modulation, adding cyclic prefix and digital frequency conversion, etc. For the convenience of design and implementation, the LTE uplink waveform processing procedure is divided into four parts, includes transmitter and receiver unit, radio frequency processing unit, synchronization unit. For each part, a detailed description is given. The results of simulation are presented. The results indicate that the LTE uplink can resist 100 Hz frequency offset in EPA channel. When b0 E N equals 26 dB, the bit error rate is 34.59 10??;Secondly, this paper completes the graphical development of the LTE uplink waveform. This papert used System Generator to develop the waveform. The detailed designs of the LTE uplink on the FPGA are presented. According to different functions, the LTE uplink is divided to different modules. Every module is discussed from its input-output interfaces definition to design and processing procedures on System Generator implementation;Thirdly, the function and performance of the LTE uplink waveform are measured on the uSDR platform.This paper completes the function test and performance test of the LTE uplink waveform on the uSDR platform independent developed by our laboratory. The test result shows that the LTE uplink waveform can correctly transmit files, video and voice function in personnel interference, machines(such as computers, spectrum analyzers and other equipment) interference, wall interference disturbances in indoor environment. The performance of implementation is around 2dB worse in comparison with the simulation.The thesis designs and realizes the LTE uplink waveform on uSDR platform, which can be used for teaching experiment of colleges, universities and research institutions. At the same time, it also enriches the waveform of uSDR platform and provides reference for the more complex waveform development on the software radio platform in the future. In the graphical development of LTE uplink waveform, many functional modules which are reusable have been realized. They can be applied for rapid development of waveforms and verifying other modes.