Research And Vector Implementation Of OFDM Timing Synchronization In High Dynamic Environment

Burst transmission system based on OFDM is widely used in the field of wireless communication.The receiver may establish synchronization at any time to predict the arrival time of data.The speed and accuracy of timing synchronization directly affect the subsequent process.As technology evolves,the transmitter and receiver work in a complex environment with a large relative velocity and acceleration.As the basis of wireless communication,timing synchronization affected by large frequency offset determines the performance of QFDM system in high dyn amic environment.So,it is essential to achieve timing synchronization in high dynamic environment with large frequency offset.With the development of processing technology and integrated circuit manufacturing,the.platform of miniaturized and low-power processing equipm ent is transforming from SoB to SoC.SoC based on SDR has gradually become the preferred selection for miniaturized and low-power wireless communication terminals because of high integration.SoC for mobile communication adopts the multi-core architecture of ARM and vector processor,in which the programmable vector processor is mainly used to implement the physical layer algorithm.Vector processor based on.VLIW and SIMD architectures has vector processing capability.The vector implementation of timing synchronization can effectively improve the system performance and has engineering significance.The thesis mainly focuses on the following contents:1.Timing synchronization simulation and improvementZC,m and Golay sequences are used as synchronization signal for simulation analysis to compare its detection success rate and computation complexity,The conclusion is that Golay sequence is suitable for follow-up study and improvement.An improved algorithm of timing synchronization is proposed to overcome problem existing in high dynamic environment with great frequency offset,which is based on differential correlation.The simulation result sh ows that the algorithm can guarantee the accuracy of time synchronization in the presen ce of large dloppler frequency shift.2.Implementation of timing synchronization based on vector processorTiming synchronization is implemented on CEVA-XC4210 which integrated on LC1860.The determnation of synchronization process is based on parallelism analysis of the algorithm from views of the processor structure and data processing and vector instruction set learning.The vector implementation is completed by writing program for target application.and the system is test on the hardware.The test results show that the actual time conuming of timing synchonization of meets the system requirements.