Coded-DPIM for Non-Diffuse Indoor Optical Wireless Communications

Digital Pulse Interval Modulation (DPIM) technique coded using a 1/3 code rate convolutional codes with 3- constraint length is presented. The channel model used is that of the non-diffuse environment with no multipath induced dispersion. Coding DPIM results in an improved packet error rate performance compared with uncoded DPIM but at the price of increased bandwidth requirement while maintaining the same energy per symbol. Results also show that DPIM with one guard band does not significantly out perform DPIM without a guard band in a non-distorting channel.

[1]  Jing Li,et al.  Optical wireless communications: system model, capacity and coding , 2003, 2003 IEEE 58th Vehicular Technology Conference. VTC 2003-Fall (IEEE Cat. No.03CH37484).

[2]  John G. Proakis,et al.  Digital Communications , 1983 .

[3]  J R Barry,et al.  Link design for nondirected wireless infrared communications. , 1995, Applied optics.

[4]  M.F.L. Abdullah,et al.  Optical wireless communication front-ends , 2004, High Frequency Postgraduate Student Colloquium, 2004.

[5]  Edward A. Lee,et al.  High-speed non-directional infrared communication for wireless local-area networks , 1992, [1992] Conference Record of the Twenty-Sixth Asilomar Conference on Signals, Systems & Computers.

[6]  Zabih Ghassemlooy,et al.  Digital pulse interval modulation for optical communications , 1998 .

[7]  Zabih Ghassemlooy,et al.  Performance of DH-PIM employing equalisation for diffused infrared communications , 2005 .

[8]  Antonio M. Tavares,et al.  Performance of wireless infrared transmission systems considering both ambient light interference and intersymbol interference due to multipath dispersion , 1999, Other Conferences.

[9]  Joseph M. Kahn,et al.  Coding and equalization for PPM on wireless infrared channels , 1998, IEEE GLOBECOM 1998 (Cat. NO. 98CH36250).