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30 May 2013 hard decision convolutional coding/decoding A few m-files showing CV encoding/Viterbi hamming distance decoding Author: B Gremont eng_mt

Hello,,,,

plz it is very Urgent in my thesis ,,,,

I need to use convoultional encoder with code rate =1/2 or 3/4 with puncturing and the decode the data using vitdec (soft-decision viterbi decoder) with NO Quantization.....

I am writing the code but I have mistake in vitdec stage...
can someone help me in correcting this code plz...

%================================================================
msg=rand(1,10)>0.5;% Random data

% Convoultional Encoder
trel = poly2trellis(6,[65,57]); % Define trellis
code = convenc(msg,trel); % Encode.

%decoding the msg using vitdec
tblen = 35; % Traceback length
decode = vitdec(code,trel,tblen,'cont','soft',3);

% bit error must be zeroo
ber= decode -code;

==============================
thanks

lulu_cpu@yahoo.com

08 Jul 2012 hard decision convolutional coding/decoding A few m-files showing CV encoding/Viterbi hamming distance decoding Author: B Gremont Kelvin O

@Alan Wang,
use the following code instead of the 'oct2bin':
dec2base(oct2dec(x),N) where x is the input to be converted and N is the base to which you want to convert x to.

09 Mar 2012 Impact of quantization on performance of convolutional codes (soft decisions) Plots the expected BER curve of soft decision quantized Viterbi decoders Author: B Gremont B Gremont

download all my files

08 Mar 2012 hard decision convolutional coding/decoding A few m-files showing CV encoding/Viterbi hamming distance decoding Author: B Gremont B Gremont

Download all my files. That way everything should work.

24 Feb 2011 hard decision convolutional coding/decoding A few m-files showing CV encoding/Viterbi hamming distance decoding Author: B Gremont Rathod Ravi

how to run all files to get results

23 Jun 2009 Impact of quantization on performance of convolutional codes (soft decisions) Plots the expected BER curve of soft decision quantized Viterbi decoders Author: B Gremont Khaltmaa

30 Apr 2009 Impact of quantization on performance of convolutional codes (soft decisions) Plots the expected BER curve of soft decision quantized Viterbi decoders Author: B Gremont Salman Alqais

program doesn't work
the program needs CVencode function. can u provide it plz??

14 Dec 2008 Impact of quantization on performance of convolutional codes (soft decisions) Plots the expected BER curve of soft decision quantized Viterbi decoders Author: B Gremont fls lee

i have got the undefined q... does anybody know what is this?
q(sqrt(2.*d.*EbNo.*coderate))

23 Jul 2008 hard decision convolutional coding/decoding A few m-files showing CV encoding/Viterbi hamming distance decoding Author: B Gremont

Download his file "Impact of quantization on performance of convolutional codes(soft decesions)". Look in author index. I have provided oct2bin function in ratings section of that m-file that may help. Be careful with bin_len.

21 Jul 2008 Impact of quantization on performance of convolutional codes (soft decisions) Plots the expected BER curve of soft decision quantized Viterbi decoders Author: B Gremont

Here is an oct2bin function to add to path for his other programs and this one.
Give a comment if you get valid results. I'm working with Gpoly[133 171] to see what Bd and WEF gives.
function binary = oct2bin(octal,bin_len)
% oct2bin(octal,binary_length) returns the binary representation
% of the octal input number, where binary_length is the desired
% number of binary digits to be output.
%
%
bin_len=7;%added for Gpoly[133 171] JC 7/21/08 (bin_len=8 may be more correct)
binary = zeros(1,bin_len+2);
i = 1;
oct = octal;
while (oct > 0)
if oct > 9
oct_digit = rem(oct,10);
else
oct_digit = oct;
end
for k = 1:3
binary(i) = rem(oct_digit,2);
oct_digit = floor(oct_digit/2);
i = i+1;
end
oct = fix(oct/10);
end
binary = binary(1,bin_len:-1:1);

01 Jul 2008 hard decision convolutional coding/decoding A few m-files showing CV encoding/Viterbi hamming distance decoding Author: B Gremont

No 'oct2bin' function!! Any one can help to figure out?

18 May 2008 BER curve for hard decision block code BPSK A simple m-file to compute the experiemntal BER of coded BPSK Author: B Gremont

29 Apr 2008 hard decision convolutional coding/decoding A few m-files showing CV encoding/Viterbi hamming distance decoding Author: B Gremont

28 Apr 2008 BER curve for hard decision block code BPSK A simple m-file to compute the experiemntal BER of coded BPSK Author: B Gremont

good

20 Apr 2008 MPSK simulation Plots the simulated and theoretical BER/SER curve of MPSK Author: B Gremont

13 Apr 2008 MPSK simulation Plots the simulated and theoretical BER/SER curve of MPSK Author: B Gremont

first thank you
but there there are not much comments to
understand well this program.

24 Feb 2008 hard decision convolutional coding/decoding A few m-files showing CV encoding/Viterbi hamming distance decoding Author: B Gremont

Sorry but i am not getting the output.
May be i am not able to simulate the program.
i am getting an error of undefined function oct2bin.
please help me.
My project is on stake

02 Nov 2007 MPSK simulation Plots the simulated and theoretical BER/SER curve of MPSK Author: B Gremont

05 Oct 2007 BER curve for hard decision block code BPSK A simple m-file to compute the experiemntal BER of coded BPSK Author: B Gremont

28 Sep 2007 Impact of quantization on performance of convolutional codes (soft decisions) Plots the expected BER curve of soft decision quantized Viterbi decoders Author: B Gremont

Good

28 Sep 2007 hard decision convolutional coding/decoding A few m-files showing CV encoding/Viterbi hamming distance decoding Author: B Gremont

Good

28 Sep 2007 MPSK simulation Plots the simulated and theoretical BER/SER curve of MPSK Author: B Gremont

28 Sep 2007 BER curve for hard decision block code BPSK A simple m-file to compute the experiemntal BER of coded BPSK Author: B Gremont

My last input for a while-The q.m function is in the MPSK zipped fie. You need to load all of the 4 files to your directery and path to run each program. Whew-should have looked at MPSK first. JC

28 Sep 2007 BER curve for hard decision block code BPSK A simple m-file to compute the experiemntal BER of coded BPSK Author: B Gremont

R13 users-to clarify the q in commented line 114,add this:
Comment line111
x1=sqrt(2.*coderate.*EbNo);add line 115
q=.5.*erfc((x1/sqrt(2));add line 116
Comment line 117
Note: q is used as an undefined variable in the other soft and hard Verterbi decoder files published by Dr. B. Gremont so it will need defining. Rating N/A JC

26 Sep 2007 BER curve for hard decision block code BPSK A simple m-file to compute the experiemntal BER of coded BPSK Author: B Gremont

On line 53-changed Es to Eb to get the m-file to run correctly. JC

04 May 2007 MPSK simulation Plots the simulated and theoretical BER/SER curve of MPSK Author: B Gremont

good work

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