Research And Implementation Of Multi-mode Cell Detection System

Cell detection plays a vital role in mobile communications,and it's the first step of establishing a data link for mobile communication systems.Due to a special engineering requirement,this paper needs to implement an integration equipment,which can realize cell detection f'or GSM,WCDMA and LTE.Cell detection includes cell search and analysis of broadcast channel.Considering the requirements for miniaturization and centralization of equipment,this paper realizes multi-mode cell detection on a single board based on Xilinx's ZYNQ platform.First,this paper implements the cell detection of GSM.Aiming at the problem that the traditional phase difference synchronization algorithm has poor detection performance sometimes,an optimization algorithm based on double threshold is proposed.The simulation results show that the proposed algorithm effectively improves the performance of cell search.After completing the synchronization of GSM,in order to obtain the required system broadcast messages,this paper designs and implements the broadcast channel demodulation and decoding.Secondly,this paper implements the cell detection of WCDMA.Due to the problem that the existing algorithm of primary scrambling code synchronization occupies too much storage space,this paper proposes an optimization algorithm based on two thresholds.The simulation results show that the proposed algorithm reduces the required storage space,and the detection performance is ensured.After completing the synchronization of WCDMA,in order to obtain the system broadcast messages,this paper designs and implements the broadcast channel demodulation and decoding.In addition,for the problem that the primary synchronization algorithm is difficult to identify the secondary cell in the case of multi-cell,this paper designs and realizes the method of performing the multi-cell detection by canceling the synchronization channel.Finally,combined with the work of other team members in LTE,the architecture design and process optimization of multi-mode cell detection based on ZYNQ platform was completed.Through the development of the PS-PL interconnect interface and the FPGA design of important module in PL,the multi-mode cell detection system based on FPGA-ARM is completed.Based on the practical test of the software on the mobile phone,it shows that the hardware developed in this paper has good performance and practical value.The development purpose of the integrated equipment for cell detection is realized.