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• W311211458 abstract "The proposed project takes origin from a cooperation initiative named NEWCOM++ amongresearch groups to develop 3G wireless mobile system. This work, in particular, tries to focuse onthe communication errors arising on a message signal characterized by working under WiMAX802.16e standard. It will be shown how this last wireless generation protocol needs a specificflexible instrumentation and why an LDPC error correction code suitable in order to respect thequality restrictions. A chapter will be dedicated to describe, not from a mathematical point of view,the LDPC algorithm theory and how it can be graphically represented to better organize thedecodification process.The main objective of this work is to validate the PHAL-concept when addressing acomplex and computationally intensive design like the LDPC encoder/decoder. The expected resultsshould be both conceptual; identifying the lacks on the PHAL concept when addressing a realproblem; and second to determine the overhead introduced by PHAL in the implementation of aLDPC decoder.The mission is to build a NoC (Network on Chip) able to perform the same task of a generalpurpose processor, but in less time and with better efficiency, in terms of component flexibility andthroughput. The single element of the network is a basic processor element (PE) formed by theunion of two separated components: a special purpose processor ASIP, the responsible of the inputdata LDPC decoding, and the router component PHAL, checking incoming data packets andscanning the temporization of tasks execution.Supported by a specific programming tool, the ASIP has been completely designed, from thearchitecture resources to the instruction set, through a language like C. Realized in this SystemCcode and converted in VHDL language, it's been synthesized as to fit onto an FPGA of the XilinxVirtex-5 family. Although the main purpose regards the making of an application as flexible aspossible, a WiMAX-orientated LDPC implemented on a FPGA saves space and resources, choosingthe one that best suits the project synthesis. This is because encoders and decoders will have to findroom in the communication tools (e.g. modems) as best as possible.The whole network scenary has been mounted through a Linux application, acting as amaster element. The entire environment will require the use of VPI libraries and components able tomanage the communication protocols and interfacing mechanisms." @default.
• W311211458 created "2016-06-24" @default.
• W311211458 creator A5029162150 @default.
• W311211458 date "2009-01-01" @default.
• W311211458 modified "2023-10-17" @default.
• W311211458 title "The implementation of an LDPC decoder in a Network on Chip environment" @default.
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