Implementation of parallel Reed-Solomon Turbo Decoder
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 seminar class Active In SP Posts: 5,361 Joined: Feb 2011 28-02-2011, 02:03 PM   Implementation of parallel Reed-Solomon Turbo Decoder.ppt (Size: 120.5 KB / Downloads: 57) Implementation of parallel Reed-Solomon Turbo Decoder Objective  Implementing RTL code for RS turbo decoder.  To achieve high efficiency.  To achieve high Throughput Overview  Implementing RS turbo decoder using VHDL code.  Introduce errors.  Detecting the errors.  Correct the errors. RS Decoder  Syndrome computation (S C ).  KEY (Key- equation- solver).  CSEE (Chien search Error evaluator ). Architecture Pseudo code for RS decoder  1 : Introduce errors fSimulate noiseg  2 : Compute Syndromes  3 : if S(x) = 0 then  4 : Declare no error  5 : else (Error in code word)  6 : {Key Equation Solver}  7 : for all j such that do  8 : if = 0 then {Chien Search}  9 : Compute Yi {Forney Evaluator}  10 : Add Yi to the received symbol.  11 : end if  12 : end for  13 : end if  14 : Compare the output with the original code word K E S  Generates the key equation  Error locator  Error evaluator The two polynomial defined as  The syndromes are used to compute the error locator and error evaluator polynomial.  If there are e errors in the received code word, we can define the error locator polynomial of degree e and the error evaluator polynomial of degree at most e − 1 to be Chien Algorithm  Chien search involved checking whether for each j,  If it is, then an error has occurred at j th location in the received code word. Error Evaluator  The next step is to compute the value of error, Yi that has occurred.  This is computed by Forney’s error value formula :

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