Digital Communication:Free Books on Error Control code

1. Intuitive Guide to Principles of Communications-complextoreal
2. Introduction to Binary Convolutional Codes- Yunghsiang S. Han
3. On Woven Convolutional Codes-Stefan Höst (PdD Thesis)
4. Essential Coding Theory, Prof. Madhu Sudan
5. Algorithmic Information Theory, G J Chaitin
6. Complexity Issues in Coding Theory, Alexander Barg
7. Theory of Codes, Jean Berstel, Dominique Perrin, C. Reutenauer
8. Codes and Automata, Jean Berstel, Dominique Perrin, C. Reutenauer
9. A Tutorial on Convolutional Coding with Viterbi Decoding-Chip Fleming
10. Evaluation of Soft Output Decoding for Turbo Codes-Huang, Fu-hua
11. The Error Correcting Codes (ECC) (This site contains several computer programs that implement encoding and decoding routines of popular error correcting codes)
12. Error Bounds for Convolutional Codes and an Asymptotically Optimum Decoding Algorithm-ANDREW J. VITERBI
13. Codes and Decoding on General Graphs-Niclas Wiberg
14. Tutorials in Communications Engineering