[1]

Ubolthip Sethakaset and T. Aaron Gulliver, 
Differential Amplitude Pulse-Position Modulation in Indoor Wireless Communications.  [1]
EURASIP Journal on Applied Signal Processing 2005:1, 3–11
2005 Hindawi Publishing Corporation


[2]
Z. Ghassemlooya , A. R. Hayesa and N. L. Seedb
The Effect of Multipath Propagation on the Performance of DPIM on Diffuse Optical
Wireless Communications
http://soe.unn.ac.uk/ocr/downloads/2001/ghassemlooy/DPIM-MP-canada-01/PIM-MLPth-03-01.pdf

[3]
Nawras M. Aldibbiat, Z. Ghassemlooy, R. McLaughlin 
Performance of Dual Header-Pulse Interval Modulation (DH-PIM) for
Optical Wireless Communication Systems


[4]
Da-shan Shiu and Joseph M. Kahn
Differential Pulse-Position Modulation for Power-Efficient Optical Communication
IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 47, NO. 8, AUGUST 1999 1201

[5]
N. M. Aldibbiat, Z. Ghassemlooy and R. McLaughlin, 
“Spectral characteristics of Dual Header-Pulse Interval
Modulation (DH-PIM)”, (Submitted to IEE Proc.-Optoelectron.).

[6]
John R. Barry, Joseph. M. Kahn, William. J. Krause, Edward. A. Lee, and David. G. Messerschmitt, 
"Simulation of Multipath Impulse Response for Indoor Wireless Optical Channels", IEEE J. Sel. Areas in Commun., vol. 11, no. 3, pp. 367-379, April 1993


[7]
K. K. Wong*,s, T. O'Farrell and M. Kiatweerasakul
The performance of optical wireless OOK, 2-PPM and spread spectrum under the effects 
of multipath dispersion and artificial light interference
INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS 2000;

[8]
Antonio M. R. Tavares, Rui J. M. T. Valadas, A. M. de Oliveira Duarte
Performance of wireless infrared transmission systems considering
both ambient light interference and inter-symbol interference
due to multipath dispersion

[9]
Optical interference produced by artificial light
Adriano J.C. Moreira, Rui T. Valadas and A.M. de Oliveira Duarte

[10]
Hyuncheol Park and John R. Barry
Modulation Analysis for Wireless Infrared Communications
To appear in IEEE International Conference on Communications, ICC'95

PPM
[11]
Mlik D. Audeh, Joseph M. Kahn, and Jony R. Barry.
Performance of Pulse-Position Modulation on Measured Non-Direct Indoor Infrared Channels.
IEEE Transactions on Communications, VOL. 44, No. 6, June 1996.

 [12]
Antonio M. R. Tavares, Rui J. M. T. Valadas, A. M. de Oliveira Duarte
Performance of wireless infrared transmission systems considering
both ambient light interference and inter-symbol interference
due to multipath dispersion

 [13]
Adriano J.C. Moreira, Rui T. Valadas and A.M. de Oliveira Duarte.
Optical interference produced by artificial light.
Wireless Networks 3 (1997) 131–140

Possibly good links which we were not able to reach:
Nyquist pulse. What is this? Needed to understand how OOK pulse is recognized
after multipath room response:
[m1]
E.A. Lee and D.G. Messerchmitt, Digital Communication. Boston,
MA: Kluwer Academic, 1988.
Possibly this helps link:
http://books.google.ru/books?id=MAeAIdQsnUkC&pg=PA21&lpg=PA21&dq=E.+A.+Lee,+and+D.+G.+Messerschmitt+1988&source=bl&ots=-gdTysMeqx&sig=f5zdPg50HojlKVjL8Knz4gemC2M&hl=ru&ei=Bl-GSo70E83J-QbB05S7CQ&sa=X&oi=book_result&ct=result&resnum=10#v=onepage&q=Nyquist&f=false

General links:
http://en.wikipedia.org/wiki/Matched_filter


Possibly good source of links and articles

Heap:
http://www.dspguru.com/comp.dsp/tricks/impl/qam_filt.htm