can any one tell me about the reedsolomon coding

[Jeeva]

i have developed wimax protocol . in that i have developed all other blocks except reedsolomon coding . i cant understand that . so plz can any one tell me about the reedsolomon coding

thanks and regards,
-jeeva

 

[deolan]

Hi,

For understanding, how you can implement the WiMAX RS coder, you should use the following script on Matlab:

y = ['D4';'BA';'A1';'12';'F2';'74';'96';'30';'27';'D4';'88';'9C';'96';'E3';'A9';'52';'B3';'15';'AB';'FD';'92';'53';'07';'32';'C0';'62';'48';'F0';'19';'22';'E0';'91';'62';'1A';'C1'];
y = hex2dec;
yk=[zeros(1,203) y' 0]; % Make source data
m = 8; % Number of bits per symbol
n = 2^m-1; % Word lengths for code
k= 239; % Number of information symbols
msg=gf([yk],m); % Galois array
gen=rsgenpoly(n,k,285,0) % Specify RS generation polynomial
code = rsenc(msg,n,k,gen) % Encode the information symbols

This is an example with WiMAX example data from page 444 of IEEE Std 802.16-2004.

There are a lot of algorithms for RS decoder, and you should choose one of them, depending on available memory and mips resources.