Alamouti coding for indoor optical wireless communications using ACO-OFDM

This paper describes the use of Alamouti coding in indoor optical wireless systems using asymmetrically clipped optical OFDM. The performance is compared with systems in which the same signal is simultaneously transmitted from both transmitters. Expressions are calculated for the signal to noise ratio as a function of distance between the transmitters and reeivers for the case where there is line of sight between transmitters and receivers. It is shown that while the performance of Alamouti coding is independent of the difference in delay for the two paths, the performance of repetition coding depends on the delay and the OFDM subcarrier frequency. ??

[1]  Mohsen Kavehrad,et al.  Shadowing and blockage in indoor optical wireless communications , 2003, GLOBECOM '03. IEEE Global Telecommunications Conference (IEEE Cat. No.03CH37489).

[2]  Charles L. Brown.  Performance Bounds for Free-Space Optical MIMO Systems with APD Receivers in Atmospheric Turbulence , 2008 .

[3]  Joseph M. Kahn,et al.  Wireless Infrared Communications , 1994 .

[4]  Marvin K. Simon,et al.  Alamouti-type space-time coding for free-space optical communication with direct detection , 2005, IEEE Transactions on Wireless Communications.

[5]  Jean Armstrong,et al.  Power efficient optical OFDM , 2006 .

[6]  Maïté Brandt-Pearce,et al.  Free-space optical MIMO transmission with Q-ary PPM , 2005, IEEE Transactions on Communications.

[7]  Jean Armstrong,et al.  Comparison of Asymmetrically Clipped Optical OFDM and DC-Biased Optical OFDM in AWGN , 2008, IEEE Communications Letters.

[8]  William G. Cowley,et al.  The Gaussian free space optical MIMO channel with Q-ary pulse position modulation , 2008, IEEE Transactions on Wireless Communications.

[9]  Helmut Bölcskei,et al.  An overview of MIMO communications - a key to gigabit wireless , 2004, Proceedings of the IEEE.

[10]  Oswaldo González,et al.  Adaptive OFDM system for multi-user communications over the indoor wireless optical channel , 2007, SPIE Microtechnologies.

[11]  Siavash M. Alamouti,et al.  A simple transmit diversity technique for wireless communications , 1998, IEEE J. Sel. Areas Commun..

[12]  A.F. Molisch,et al.  MIMO systems with antenna selection , 2004, IEEE Microwave Magazine.

[13]  Murat Uysal,et al.  Do We Really Need OSTBCs for Free-Space Optical Communication with Direct Detection? , 2008, IEEE Transactions on Wireless Communications.