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Bloques Funcionales del Reverse Traffic Channel basados en un Modelo Generalizado LFSR.

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Author(s): Carlos Pérez | Julio García

Journal: Avances en Sistemas e Informática
ISSN 1657-7663

Volume: 4;
Issue: 2;
Start page: 89;
Date: 2007;
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Keywords: Linear Feedback Shift Registers LFSR | CRC | FEC | Convolutional Coding | CDMA Reverse Traffic Channel IS-95

ABSTRACT
The document presents a design methodology, based on Software Defined Radios (SDR), and focused to model CDMA Reverse Traffic Channel functional blocks. Also, a validation methodology is presented, in order to check results obtained after functional implementation of blocks in VHDL. A procedure for automatic VHDL code generation of analyzed blocks is proposed, by means of a generalized structure, based on modified Linear Feedback Shift Registers (mLFSR), which allowthe generation of additional functional outputs from linear combination of register positions. Also, a matrix model is proposed, in order to setup feedback loops and functional outputs. Blocks are modeled as a Hidden Marvok Model (HMM). For validation methodology, graphic file generation using *.vec files is proposed, using results from Simulink, which may be used in development environments like MAX PLUS II or QUARTUS II. Generated files allow direct simulation and corresponding results checking. For the generation of VHDL code, an approach entity-based approach is made, as a focus to hierarchicaldecomposition based on functional units where a VHDL entity is taken as a hardware object abstraction, in this case a Functional Block.
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