Free Books on Information Theory and Communication System

1. Fundamentals of Wireless Communication, David Tse and Pramod Viswanath
2. Information Theory, Inference and Learning Algorithms, David J. C. MacKay
3. Entropy and Information Theory, R.M. Gray
4. Complexity Issues in Coding Theory, Alexander Barg
5. Network Coding Theory, Raymond W. Yeung, Shuo-Yen Robert Li, Ning Cai and Zhen Zhang
6. Notes on Coding Theory, Jonathan I. Hall
7. A Short Course in Information Theory, David J.C. MacKay
8. Information, Randomness and Incompleteness, G J Chaitin, IBM Research
9. Introduction to Data Communications, by Eugene Blanchard
10. Understanding Optical Communications
11. Primer on Information Theory, Thomas Schneider
12. High-Speed Communication Circuits and Systems, Prof. Michael Perrott
13. Communication System Design, Prof. Vladimir Stojanovic
14. Essential Coding Theory, Prof. Madhu Sudan
15. Speech Communication, Prof. Kenneth Steven
16. Quantum Optical Communication, Prof. Jeffrey H. Shapiro
17. Principles of Digital Communications I, Prof. Robert Gallager, Prof. Lizhong Zheng
18. Principles of Digital Communication II, Prof. David Forney
19. Transmission of Information, Prof. Muriel Medard, Prof. Lizhong Zheng
20. Data Communication Networks, Prof. Eytan Modiano
21. Primer on Information Theory by Thomas Schneider

Free ebook and online resources on Free Space Optics ( Optical Wireless Communication)

1. Handbook of Optical Through the Air Communications, David A. Johnson
2. Wireless Infrared Communications- Kahn and Barry
3. Short-Range Optical Wireless Communications-O’Brien, Katz, Green
4. A Review on Indoor Optical Wireless Systems-Singh, John, FIETE
5. Optical Wireless: The Story So Far-Heatley, Wisely, Neild, and Cochrane
6. Indoor Optical Wireless Communication Systems – Part I: Review- Z. Ghassemlooy
7. THE PHYSICS OF FREE-SPACE OPTICS -Scott Bloom
8. Analysis of Free Space Optics as a Transmission Technology - Garlington, Babbitt and Long
9. Common Misconceptions about Free Space Optics-fSona
10. Free Space optics (fso): An Introduction
11. What is Free Space Optics (FSO)
12. Overview : Free-Space Optical Communications at JPL/NASA- Hamid Hemmati
13. Understanding the performance of free-space optics - Bloom,Korevaar, Schuster and Willebrand
14. Optical (through-the-air)communications
15. Free-space optics technology improves situational awareness on the battlefield-Al-Akkoumi,Huck and Sluss
16. FREE SPACE OPTICS :High bandwidth solution in network world-MONIKA MEHRA
17. Multi-Gigabits-per-second Optical Wireless Communications - Dr. Jeganathan and Dr.Ionov
18. Challenges In Outdoor and Indoor Optical Wireless Communications -Qazi

Visible Light Communications

1. Visible Light Communications - Sylvester C.S. Lo

Web resources 
Indoor Free-Space Optical Communication -J.M. Kahn
Optical Wireless at Oxford
Optical Wireless at Northumbria - Zhassemlooy
Fsona
LightPointe
Support Solutions Inc
Optical Communication Group- Nasa
IrDA

Manufacturer Website
Fsona
LightPointe
CanoBeam
Cablefree IrDA MOSTCOM
PAV 
free space optics solutions

Laser Information Telecommunications