Abstract

In this paper, we investigate the cooperative diversity technique as a candidate solution for combating turbulence-induced fading over free-space optical (FSO) links. In particular, we propose a novel cooperation strategy that is suitable for quantum-limited FSO systems with any number of relays and we derive closed-form expressions for the error performance of this strategy. In scenarios where the channel-state-information (CSI) is available at the different nodes, we propose an optimal power allocation strategy that satisfies the Karush-Kuhn-Tucker (KKT) conditions and that further boosts the performance of FSO networks. It turned out that this closed-form optimal solution corresponds to transmitting the entire optical power along the “strongest link” between the source and the destination nodes. A simple procedure is proposed for selecting this link and for distributing the power among its different hops.

© 2011 IEEE

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  1. D. Kedar, S. Arnon, "Urban optical wireless communications networks: The main challenges and possible solutions," IEEE Commun. Mag. 42, 2-7 (2003).
  2. X. Zhu, J. Kahn, "Free-space optical communication through atmospheric turbulence channels," IEEE Trans. Commun. 50, 1293-1300 (2002).
  3. S. G. Wilson, M. Brandt-Pearce, Q. Cao, J. H. Leveque, "Free-space optical MIMO transmission with Q-ary PPM," IEEE Trans. Commun. 53, 1402-1412 (2005).
  4. A. Garcia-Zambrana, C. Castillo-Vazquez, B. Castillo-Vazquez, A. Hiniesta-Gomez, "Selection transmit diversity for FSO links over strong atmospheric turbulence channels," IEEE Photon. Technol. Lett. 21, 1017-1019 (2009).
  5. M. Safari, M. Uysal, "Do we really need OSTBCs for free-space optical communication with direct detection?," IEEE Trans. Wireless Commun. 7, 4445-4448 (2008).
  6. J. Laneman, D. Tse, G. Wornell, "Cooperative diversity in wireless networks: Efficient protocols and outage behavior," IEEE Trans. Inf. Theory 50, 3062-3080 (2004).
  7. M. Karimi, M. Nasiri-Kenari, "BER analysis of cooperative systems in free-space optical networks," J. Lightw Technol. 27, 5639-5647 (2009).
  8. C. Abou-Rjeily, A. Slim, "Cooperative diversity for free-space optical communications: Transceiver design and performance analysis," IEEE Trans. Commun. .
  9. S. Halme, B. Levitt, R. Orr, “Bounds and approximations for some integral expression involving lognormal statistics,” MIT Res. Lab. Electron. Quart. Prog. Rept. (1969).

2009

A. Garcia-Zambrana, C. Castillo-Vazquez, B. Castillo-Vazquez, A. Hiniesta-Gomez, "Selection transmit diversity for FSO links over strong atmospheric turbulence channels," IEEE Photon. Technol. Lett. 21, 1017-1019 (2009).

M. Karimi, M. Nasiri-Kenari, "BER analysis of cooperative systems in free-space optical networks," J. Lightw Technol. 27, 5639-5647 (2009).

2008

M. Safari, M. Uysal, "Do we really need OSTBCs for free-space optical communication with direct detection?," IEEE Trans. Wireless Commun. 7, 4445-4448 (2008).

2005

S. G. Wilson, M. Brandt-Pearce, Q. Cao, J. H. Leveque, "Free-space optical MIMO transmission with Q-ary PPM," IEEE Trans. Commun. 53, 1402-1412 (2005).

2004

J. Laneman, D. Tse, G. Wornell, "Cooperative diversity in wireless networks: Efficient protocols and outage behavior," IEEE Trans. Inf. Theory 50, 3062-3080 (2004).

2003

D. Kedar, S. Arnon, "Urban optical wireless communications networks: The main challenges and possible solutions," IEEE Commun. Mag. 42, 2-7 (2003).

2002

X. Zhu, J. Kahn, "Free-space optical communication through atmospheric turbulence channels," IEEE Trans. Commun. 50, 1293-1300 (2002).

IEEE Commun. Mag.

D. Kedar, S. Arnon, "Urban optical wireless communications networks: The main challenges and possible solutions," IEEE Commun. Mag. 42, 2-7 (2003).

IEEE Photon. Technol. Lett.

A. Garcia-Zambrana, C. Castillo-Vazquez, B. Castillo-Vazquez, A. Hiniesta-Gomez, "Selection transmit diversity for FSO links over strong atmospheric turbulence channels," IEEE Photon. Technol. Lett. 21, 1017-1019 (2009).

IEEE Trans. Commun.

X. Zhu, J. Kahn, "Free-space optical communication through atmospheric turbulence channels," IEEE Trans. Commun. 50, 1293-1300 (2002).

S. G. Wilson, M. Brandt-Pearce, Q. Cao, J. H. Leveque, "Free-space optical MIMO transmission with Q-ary PPM," IEEE Trans. Commun. 53, 1402-1412 (2005).

C. Abou-Rjeily, A. Slim, "Cooperative diversity for free-space optical communications: Transceiver design and performance analysis," IEEE Trans. Commun. .

IEEE Trans. Inf. Theory

J. Laneman, D. Tse, G. Wornell, "Cooperative diversity in wireless networks: Efficient protocols and outage behavior," IEEE Trans. Inf. Theory 50, 3062-3080 (2004).

IEEE Trans. Wireless Commun.

M. Safari, M. Uysal, "Do we really need OSTBCs for free-space optical communication with direct detection?," IEEE Trans. Wireless Commun. 7, 4445-4448 (2008).

J. Lightw Technol.

M. Karimi, M. Nasiri-Kenari, "BER analysis of cooperative systems in free-space optical networks," J. Lightw Technol. 27, 5639-5647 (2009).

Other

S. Halme, B. Levitt, R. Orr, “Bounds and approximations for some integral expression involving lognormal statistics,” MIT Res. Lab. Electron. Quart. Prog. Rept. (1969).

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