[SOLVED] Turbo code encoder and decoder in MATLAB

• Apr 10, 2010

• #1

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Kurosaki2010

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Hi all,

I hope you would be able to help me out. I have written a turbo code encoder and decoder in MATLAB with the specs below:

Channel Additive White Gaussian Noise (AWGN)
Modulation Binary Phase Shift Keying (BPSK)
Component
Encoders -
Two identical recursive
convolutional codes
RSC
Parameters
n = 2, k = 1,K = 3
G0 = 7, G1 = 5
Interleaver
1000-bit random interleaver
Puncturing
Used
Half parity bits from each component
encoder transmitted give half-rate code
Component
Decoders
Log-MAP
decoder
Iterations 8

I expected for 8 iterations, that the BER would be very small for high snr, but to my surprise, This is not so. the BER is still high in comparison to other journals results. The alg is correct to my knowledge. Thanks in advance for your help.

 

• Feb 11, 2011

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bhagath

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hi please anyone send me the matlab code for dual repeat punctured turbo codes

 

• Mar 16, 2011

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Naresh224

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i hope this will do it.

turbo_logmap_matlab.rar (456.9 KB)

if any one can give me VHDL or Verilog for the same i would welcome...

 

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• turbo_logmap_matlab.rar

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• Apr 6, 2011

• #4

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Projectinfo

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hi,
can someone help me out with the turbo encoder matlab code or verilog code pls...

 

• Aug 15, 2011

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tampun

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Hi, how to verify that the designed turbo encoder has been working OK or not ?

 

• Aug 15, 2011

• #6

Ahmed Alaa

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Go to complex2real website and you'll find a detailed example that you can compare with your decoder's outputs.

 

• Aug 17, 2011

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tampun

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Is this what you mean **broken link removed**, baarakallahu fiik

 

• Aug 17, 2011

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Ahmed Alaa

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Yes, it is, it is very useful.

 

• Aug 18, 2011

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Kurosaki2010

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Hi all, realize this may be too late. was a slight error in programming that caused the creation of this thread . Another good resource for Turbo codes is from William E ryan.
**broken link removed**
also a detailed proof on Turbo can be found using this book:
Turbo Coding, Turbo Equalisation and Space-Time Coding by Lajos Hanzo

Both resources really helped me when I was starting up. Hope this helps you guys.

 

• Aug 24, 2012

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Neetu1

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Hi kurosaki 2010

I need the code for turbo encoder and decoder.

Please upload it here or send it to me by email on sweettttiii@gmail.com

I want to add it with ofdm and want to see improvement in ber.

I request you to upload it soon so that i can complete my M.tech thesis on time.

Thanks in advance

 

• Feb 11, 2013

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krishna chaitanya.

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Naresh224 said:

i hope this will do it.

turbo_logmap_matlab.rar (456.9 KB)

if any one can give me VHDL or Verilog for the same i would welcome...

Click to expand...

can u send me vhdl code for turbo decoder if u have it.Thank you in advance.

 

• Feb 27, 2013

• #12

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pushkar2607

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it is giving error as
Undefined function or method 'encoderm' for input arguments of type 'double'.

Error in ==> turbo_logmap at 74
en_output = encoderm( x, g, alpha, puncture ) ; % encoder output (+1/-1)
please help me...

 

• Mar 3, 2013

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tkmmelvin

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can anyone send the matlab code for turbo encoder and decoder to my mail id tkmmelvin@gmail.com?