Turbo decoder

We propose an adaptive channel SNR estimation algorithm required for the iterative MAP decoding of turbo decoders. The proposed algorithm uses the extrinsic values generated within the iterative MAP decoder to update the channel SNR estimate toward its optimum value per each decoder iteration or per each turbo code frame.

[1]  A. Glavieux,et al.  Near Shannon limit error-correcting coding and decoding: Turbo-codes. 1 , 1993, Proceedings of ICC '93 - IEEE International Conference on Communications.

[2]  B. Sklar,et al.  A primer on turbo code concepts , 1997, IEEE Commun. Mag..

[3]  Stephen G. Wilson,et al.  SNR mismatch and online estimation in turbo decoding , 1998, IEEE Trans. Commun..

[4]  John Cocke,et al.  Optimal decoding of linear codes for minimizing symbol error rate (Corresp.) , 1974, IEEE Trans. Inf. Theory.

[5]  Nam C. Phamdo,et al.  Turbo decoders which adapt to noise distribution mismatch , 1998, IEEE Communications Letters.

[6]  Joachim Hagenauer,et al.  Iterative decoding of binary block and convolutional codes , 1996, IEEE Trans. Inf. Theory.