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Design Notes

Reed Solomon Encoding/Decoding

This example compares the behavior of the RS_ENC and RS_DEC blocks to the equivalent functions in MATLAB® . The VSS MATLAB block is used to invoke MATLAB. The VSS RS blocks allow specification of shortened codes, the initial root, and the scaling factor of the generator polynomial.

RS_ENC accepts k information symbols and encodes them to an output block of length n by adding n-k parity symbols.

RS_DEC accepts the n symbol block and produces the decoded k symbol block.

The digital source RND_D has an alphabet size of 2^m.

You need to have MATLAB and the Communications Toolbox installed in order to run this example. The MATLAB blocks call the gf(), rsenc() and rsdec() MATLAB functions.

Input Parameters:

m: number of bits/symbol over GF(2^m)

n: block length

k: message length

genpoly: generator polynomial in decimal e.g. D^3 + D^2 + 1 = 1 1 0 1 = 13

Note: MATLAB is a registered trademark of The MathWorks Inc.