convolution code for 2/3 rate using matlab

[iTdl]

convolution matlab

I want to develop a convolution code using trellis with rate 2/3. condition is that -- input bits are 16 and output bits are 24 (thus making 2/3 rate). The problem is I have to write a generator matrix of 16X24 in trellis in convolution coding blokset (comm toolbox in Matlab). This is actually very cumbersome and will take lot of time for simulation. I tried with lot of combinations but it is not giving me desired data rates at the input and output of convolution coding block. Can anybody help me in this regard?

 

[helios]

convolution code

hmmm

can u please send ur code ...?

have u tried code puncturing for high rates ?



helios

 

[iTdl]

convolution coding

Hi, actually I have not written a specific code, I am using the inbuilt blocks in Matlab. I used convolution blockset of Matlab and specified the trellis structure. My requirement is 16 bit input, 24 bit output (2/3 rate) with two bit tail biting in trellis. I couldnt specify the trellis for this.

Puncturing is also a requirement, but I was not able to do it in trellis. I will read more on puncturing and try.

 

[helios]

convolution in matlab

hai

Just look at this code and i hope u`ll get some info...

Puncturing will really boost the data rates ... but u must be very careful when u implement it .

-helios

 

[iTdl]

convolution code matlab

My basic problem is achieving the 2/3 rate with convolution code using convolution blockset of matlab and the specifications are as i said 16bit input and 24 bit output. For this I have to write trellis structure to it. If that is solved I can proceed with puncturing.

 

[helios]

convolutional code matlab

i worked with trelis path long ago

so i cant remembers things


did u go to mathworks web site...

I think it will be better if u post the similqar problem in mathworks forum...
u can also browse trou the mathworks code exchange links




-Helios

 

[iTdl]

convolution using matlab

ok, I will get the info.

 

[iTdl]

matlab program for convolution

I got the partial answer of it. I am uploading the .mdl file of matlab. Actually I have to use the convolutional encoder block of simulink for 4-state encoder with rate 1/2 and then puncture it with pattern [1 1 1 0] making it to increase the rate by 4/3 making it effective 2/3. But I am not getting the exact data at the output. I am getting some bitts in error after adding 0s to the punctured bits. I dont know why.

 

[helios]

matlab code for convolutional encoder

oh !!!! :!:
thats a problem ... hea !! where is the mdl file u didnt upload dude?

any ways try experimenting with a diffrent puncture pattern or a diffrent data pattern and reduce the channel noise ...!!!


hope it helped u
-helios

 

[iTdl]

matlab trellis matrix of next states

sorry, I am attaching files for first time, facing probs.
I hope this time this will do.

In the diagram the error should be actually zero. As there is no
descripency in the data. but it is not. I dont know why.

 

[helios]

convolution matlab program

hea !! still i did nt see the file which u have attached

hmmm ... send ur files to r/a/j/a/r/a/j/a/s/e/k/a/r/a/n/@/g/m/a/i/l/./c/o/m

ignore the "/" in my mail id


-helios

 

[helios]

convolution code in matlab

I ran the model in Matlab ... but many warnings are pumped out ... then only i noticed that I dont have a communication toolbox in my MATLAB...

so i think i would not be able to run and tell u wats worng

sorry.

hope u understand that i cant use any illegal version in my comp .


- helios

 

[zahedi79]

covolution coding

this is a 2/3 rate version by MATLAB

 

[leotino]

punctured convolutional codes matlab

how bout the puncturing matlab program...can u show it??thx a lot...

 

[zahedi79]

blocks convolving matrices in matlab

punching in matlab 7.3 help is explaind.