Design And Implementation Of LDPC Encode And Decode Device Based On Android Platform

"BDS High-precision WAAS system" aims to establish Beidou High-precision WAAS Platform, Produce wide-area enhance service information based on satellites, transmission signal by LDPC code, modulates the information transmitted by the ground station upload forwarding broadcast by satellite payload, Beidou navigation and Beidou High-precision WAAS enhanced service information both received and processed by Beidou navigation enhanced receiver.Introduced the development of embedded systems and LDPC encoding and decoding technology, Brief description the research objectives and the project background, describes the logical relationships of different chapters of this article and the main content.Introduced the basic principles of LDPC, Researched the commonly used encoding algorithm and decoding algorithm of LDPC. encoding and decoding algorithm mechanism in-depth analysis, provide a theoretical basis of design and implementation of LDPC coding and decoding device.The Smart210 embedded development board as the hardware platform, Android system kernel has been tailored, compiled, and transplanted, some low-level hardware device drivers been analysis and transplanted, Established application development environment and completed building of embedded Android platform, The basic conditions directly on this platform for various embedded application software development, and the same time for this article of LDPC encoder and decoder implementations provide an important prerequisite and input guarantee.Based on LDPC encoding and decoding algorithm mechanism and combining hardware and software platform of embedded Android system, designed and implemented LDPC code main program interface, Respectively, to complete the configuration of the LDPC encoder and LDPC decoder interface file, module design and implementation of the sub-thread module, data reception and pre-processing module, the output display complete the configuration of interface file, design and implementation of the sub-thread module, data reception and pre-processing module, the output display module, complete the body work of design and implementation of LDPC encode and decoder device based on Android platform.Based SWT Designer software, developed LDPC code test platform, complete the design and implementation of each module of test platform, carried out on the embedded Android platform function test, the test results are analyzed to proved the correct of LDPC encode and decode device.This article is designed and implemented based on the Android platform LDPC decoder directly applied to high precision Wide Area Augmentation Service Beidou receiving terminalsystem development; focus on the future development and testing needs LDPC decoder technology, synchronized with the LDPC encode design and implementation. Based on the Android platform of encode and decode device, running stability codes refined, user-friendly,easy to operate. In terms of reliability, versatility, portability and flexibility have greater technical advantages and prospects than traditional FPGA or DSP implementations.