Optimal Packet Length for Free-Space Optical Communications with Average SNR Feedback Channel

In this article, a method to enhance data rates of free-space optical (FSO) systems using packet length optimization is proposed. The average signal-to-noise ratio (ASNR) is measured at the receiver and sent back to the transmitter to optimize packet length. In addition, the length of packet is optimized to enhance the average throughput. We concluded that packet length can be reduced at low ASNR. However, packet length should be increased at higher values of received ASNR. For each ASNR, we also choose the optimal modulation and coding scheme (MCS) and optimal packet length to maximize the throughput. Different MCSs are investigated such as 4-pulse amplitude modulation (PAM) with and without channel coding, 8-PAM, 16-PAM, and 32-PAM. The proposed method gives 0.8–1.9 dB gain with respect to conventional FSO with adaptive modulation and coding (AMC) and fixed packet length. This is the first paper to deal with packet length optimization for FSO systems.

[1]  Mohamed-Slim Alouini,et al.  On the Performance Analysis of Hybrid ARQ With Incremental Redundancy and With Code Combining Over Free-Space Optical Channels With Pointing Errors , 2014, IEEE Photonics Journal.

[2]  Sanya Anees,et al.  Performance of an amplify-and-forward dual-hop asymmetric RF–FSO communication system , 2015, IEEE/OSA Journal of Optical Communications and Networking.

[3]  Murat Uysal,et al.  An adaptive modulation scheme for coded free-space optical systems , 2014, 2014 19th European Conference on Networks and Optical Communications - (NOC).

[4]  J. Kahn,et al.  Rate-adaptive modulation and low-density parity-check coding for optical fiber transmission systems , 2012, IEEE/OSA Journal of Optical Communications and Networking.

[5]  S. Hranilovic,et al.  Outage Capacity Optimization for Free-Space Optical Links With Pointing Errors , 2007, Journal of Lightwave Technology.

[6]  Jaedon Park,et al.  Performance Analysis of the Asymmetric Dual-Hop Relay Transmission With Mixed RF/FSO Links , 2011, IEEE Photonics Technology Letters.

[7]  Manav R. Bhatnagar,et al.  Experimental Investigation of All-Optical Relay-Assisted 10 Gb/s FSO Link Over the Atmospheric Turbulence Channel , 2017, Journal of Lightwave Technology.

[8]  Ivan B. Djordjevic,et al.  Shannon capacities and error-correction codes for optical atmospheric turbulent channels , 2005 .

[9]  Mohamed-Slim Alouini,et al.  Performance Analysis of Relay-Assisted All-Optical FSO Networks Over Strong Atmospheric Turbulence Channels With Pointing Errors , 2014, Journal of Lightwave Technology.

[10]  Anh T. Pham,et al.  Performance analysis of TCP over free-space optical links with ARQ-SR , 2013, Proceedings of the 2013 18th European Conference on Network and Optical Communications & 2013 8th Conference on Optical Cabling and Infrastructure (NOC-OC&I).

[11]  George K. Karagiannidis,et al.  BER Performance of FSO Links over Strong Atmospheric Turbulence Channels with Pointing Errors , 2008, IEEE Communications Letters.

[12]  Mohamed-Slim Alouini,et al.  On the Performance of Mixed RF/FSO Variable Gain Dual-Hop Transmission Systems with Pointing Errors , 2013, 2013 IEEE 78th Vehicular Technology Conference (VTC Fall).

[13]  J. M. Kahn,et al.  Rate-Adaptive Modulation and Coding for Optical Fiber Transmission Systems , 2011, Journal of Lightwave Technology.

[14]  Anshul Jaiswal,et al.  Performance evaluation of space shift keying in free-space optical communication , 2017, IEEE/OSA Journal of Optical Communications and Networking.

[15]  Giwan Yoon,et al.  Average Bit-Error Rate of the Alamouti Scheme in Gamma-Gamma Fading Channels , 2011, IEEE Photonics Technology Letters.

[16]  Jay L. Gao.  A study of adaptive coding and modulation over free space optical link using OCTL data , 2016, 2016 IEEE Aerospace Conference.

[17]  Mohamed-Slim Alouini,et al.  Unified performance analysis of hybrid-ARQ with incremental redundancy over free-space optical channels , 2014, 2014 IEEE 25th Annual International Symposium on Personal, Indoor, and Mobile Radio Communication (PIMRC).

[18]  Mohamed-Slim Alouini,et al.  Impact of Pointing Errors on the Performance of Mixed RF/FSO Dual-Hop Transmission Systems , 2013, IEEE Wireless Communications Letters.

[19]  I. Djordjevic.  Adaptive Modulation and Coding for Free-Space Optical Channels , 2010, IEEE/OSA Journal of Optical Communications and Networking.

[20]  Alister G. Burr,et al.  A General Upper Bound to Evaluate Packet Error Rate over Quasi-Static Fading Channels , 2011, IEEE Transactions on Wireless Communications.

[21]  Halim Yanikomeroglu,et al.  On the approximation of the generalized-Κ distribution by a gamma distribution for modeling composite fading channels , 2010, IEEE Transactions on Wireless Communications.

[22]  Hatem Boujemaa.  Delay Analysis of Cooperative Truncated HARQ With Opportunistic Relaying , 2009, IEEE Transactions on Vehicular Technology.

[23]  Zeng,et al.  Adaptive pulse amplitude and position modulation for optical wireless channels , 1996 .

[24]  Ben He,et al.  Bit-interleaved coded modulation for hybrid RF/FSO systems , 2009, IEEE Transactions on Communications.

[25]  Mohamed-Slim Alouini,et al.  Multihop communications over CSI-assisted relay IM/DD FSO systems with pointing errors , 2015, 2015 IEEE International Conference on Communication Workshop (ICCW).

[26]  Manav R. Bhatnagar,et al.  Average BER analysis of relay selection based decode-and-forward cooperative communication over Gamma-Gamma fading FSO links , 2013, 2013 IEEE International Conference on Communications (ICC).

[27]  Manav R. Bhatnagar,et al.  Performance Analysis of Hybrid Satellite-Terrestrial FSO Cooperative System , 2013, IEEE Photonics Technology Letters.

[28]  Murat Uysal,et al.  Information Theoretic Analysis of Hybrid-ARQ Protocols in Coherent Free-Space Optical Systems , 2012, IEEE Transactions on Communications.

[29]  Manav R. Bhatnagar,et al.  Performance Analysis of Gamma–Gamma Fading FSO MIMO Links With Pointing Errors , 2016, Journal of Lightwave Technology.

[30]  Murat Uysal,et al.  Outage analysis of Hybrid-ARQ protocols in coherent free-space optical communications , 2011, 2011 IEEE 22nd International Symposium on Personal, Indoor and Mobile Radio Communications.

[31]  Anshul Jaiswal,et al.  Adaptive coding and modulation (ACM) technique for performance enhancement of FSO Link , 2016, 2016 IEEE First International Conference on Control, Measurement and Instrumentation (CMI).

[32]  Erich Leitgeb,et al.  Adaptive coded modulation for FSO links , 2012, 2012 8th International Symposium on Communication Systems, Networks & Digital Signal Processing (CSNDSP).