Performance study of variable-rate modulation for underwater communications based on experimental data

In this paper, we present an analysis of the performance of a variable-rate adaptive modulation system based on instantaneous SNR information. The SNR traces we consider are part of the SubNet'09 experimental dataset, and have been derived by processing an hyperbolic frequency-modulated signal in the 9-14 kHz band. We start by deriving the high level behavior of the channel in terms of the statistics of channel fading effects, which are found to be well modeled by a Nakagami-m distribution, where the parameter m is estimated over a whole experiment or over smaller time windows throughout the experiment, depending on the variability of the SNR. The statistics of the channel behavior are then used to derive the performance of a variable-rate modulation scheme switching between five different constellations; the cases of both instantaneous and outdated channel knowledge are considered. Analytical results are compared to simulations to show that the Nakagami-m distribution can satisfactorily capture the statistics of the channel, provided that the estimation of the m parameter, as well as of the correlation of the SNR process, is repeated in case of macroscopic channel variations.

[1]  W. T. Webb,et al.  Variable rate QAM for mobile radio , 1995, IEEE Trans. Commun..

[2]  Georgios B. Giannakis,et al.  How accurate channel prediction needs to be for transmit-beamforming with adaptive modulation over Rayleigh MIMO channels? , 2004, IEEE Transactions on Wireless Communications.

[3]  Andrea Zanella,et al.  APOS: Adaptive Parameters Optimization Scheme for Voice over IEEE 802.11g , 2008, 2008 IEEE International Conference on Communications.

[4]  Milica Stojanovic,et al.  Recent advances in high-speed underwater acoustic communications , 1996 .

[5]  Lajos Hanzo,et al.  Adaptive modulation techniques for duplex OFDM transmission , 2000, IEEE Trans. Veh. Technol..

[6]  Mani B. Srivastava,et al.  Software-defined underwater acoustic networking platform , 2009, WUWNet.

[7]  Parastoo Qarabaqia.  STATISTICAL MODELING OF A SHALLOW WATER ACOUSTIC COMMUNICATION CHANNEL , 2009 .

[8]  Milica Stojanovic,et al.  Reconfigurable acoustic modem for underwater sensor networks , 2006, Underwater Networks.

[9]  Milica Stojanovic,et al.  Underwater Acoustic Communications and Networking: Recent Advances and Future Challenges , 2008 .

[10]  Michele Zorzi,et al.  Experimental study of the space-time properties of acoustic channels for underwater communications , 2010, OCEANS'10 IEEE SYDNEY.

[11]  Mohamed-Slim Alouini,et al.  Digital Communication Over Fading Channels: A Unified Approach to Performance Analysis , 2000 .

[12]  Milica Stojanovic,et al.  Statistical characterization and capacity of shallow water acoustic channels , 2009, OCEANS 2009-EUROPE.

[13]  A. Goldsmith,et al.  Variable-rate variable-power MQAM for fading channels , 1996, Proceedings of Vehicular Technology Conference - VTC.

[14]  F. De Rango,et al.  Markovian approach to model Underwater Acoustic channel: Techniques comparison , 2008, MILCOM 2008 - 2008 IEEE Military Communications Conference.

[15]  J. Wallace,et al.  Power and complex envelope correlation for modeling measured indoor MIMO channels: a beamforming evaluation , 2003, 2003 IEEE 58th Vehicular Technology Conference. VTC 2003-Fall (IEEE Cat. No.03CH37484).

[16]  Dongweon Yoon,et al.  On the general BER expression of one- and two-dimensional amplitude modulations , 2002, IEEE Trans. Commun..

[17]  F. Henyey,et al.  Effect of the Internal Tide on Acoustic Transmission Loss at Midfrequencies , 2010, IEEE Journal of Oceanic Engineering.

[18]  X. Yu.  Wireline quality underwater wireless communication using high speed acoustic modems , 2000, OCEANS 2000 MTS/IEEE Conference and Exhibition. Conference Proceedings (Cat. No.00CH37158).

[19]  I. S. Gradshteyn,et al.  Table of Integrals, Series, and Products , 1976 .

[20]  Andrea J. Goldsmith,et al.  Variable-rate variable-power MQAM for fading channels , 1997, IEEE Trans. Commun..

[21]  Mohamed-Slim Alouini,et al.  Adaptive Modulation over Nakagami Fading Channels , 2000, Wirel. Pers. Commun..