Multiuser communications for underwater acoustic networks using MIMO-OFDM-IDMA

Linton, Lance; Conder, Phillip; Faulkner, M.

doi:10.1109/icspcs.2008.4813656

Cited by 9 publications

(2 citation statements)

References 15 publications

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“…While ad-hoc networks operating in terrestrial radio environments have been studied extensively [8], [9], the analysis of ad-hoc network performance in an underwater acoustic environment remains a very challenging and complicated task. There has been recent progress on the design of multiple-access methods [10], [11], [12], medium access control protocols [13], [14], [15], [16], [17], [18] and routing schemes [19], [20], [21], [22], [23] for underwater networks. These are very important considerations in their own right; nonetheless, they focus on certain aspects of the network's performance, rather than the behavior of the network as a whole.…”

Section: Introductionmentioning

confidence: 99%

Design and Performance Analysis of Underwater Acoustic Networks

Stefanov

Stojanovic

2011

IEEE J. Select. Areas Commun.

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Abstract-We analyze the performance of underwater acoustic ad-hoc networks in the presence of interference. We assume a uniform distribution of nodes over a finite area, and focus for simplicity on a two-dimensional network. The node-to-node channel is modeled using frequency dependent path loss and Ricean fading. We adopt a communication theoretic approach and study the sustainable number of hops through the network as an indicator of the network connectivity, as well as power and bandwidth requirements. The network operation is highly dependent on the node density with two distinct regions of limited performance: the coverage-limited region, where the number of nodes in the network is small, and the interference-limited region, where the number of nodes is large. We show that a desired level of connectivity can be achieved through a judicious selection of the operating frequency, power and bandwidth. Numerical examples illustrate the results of the analysis.These results motivate us to propose a hierarchical underwater acoustic sensor network architecture in which the sensors and the collector stations operate in distinct layers. The hierarchical architecture is supported by the property of the acoustic underwater transmission medium that for each transmission distance there exists an operating frequency for which the narrowband signal-to-noise ratio is maximized. The sensors and the collector stations are consequently allocated different operating frequencies. We assume a uniform distribution of both sensors and collector stations over the finite area of the sensing field, and model the channel accordingly. The analysis is performed under the assumption that there is interference from other nodes within the same layer of the hierarchy. Numerical examples illustrate the network performance and demonstrate that the preferred operating frequencies ensure network operation without any cross-interference between the collector network and the sensor network.Index Terms-Underwater acoustic networks, ad-hoc networks, connectivity, hierarchical sensor networks.

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Section: Introductionmentioning

confidence: 99%

Design and Performance Analysis of Underwater Acoustic Networks

Stefanov

Stojanovic

2011

IEEE J. Select. Areas Commun.

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“…2. The input data stream is generated randomly by BBG, this bit stream is encoded with (7,3) size. This code is permuted by Random interleaver with unique permutation number.…”

Section: Implementation Of Idma-ofdmmentioning

confidence: 99%

Modelling and Simulation of IDMA-OFDM for Underwater Acoustic Communication

Naik

2015

DSJ

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The Ocean exhibits phenomenon of changing acoustic signal transmission due to its non-stationary nature. Water columns in between transmitter and receiver are not fixed at any point of time. Thus, designing of a wireless communication systems for underwater applications becomes significantly challenging. The speed of sound in water is 1500 m/s which introduces large delay spread in acoustic signal due to multipath phenomenon. The large time delay causes Inter-symbol Interference; this ISI degrades the performance of many receivers. However orthogonal frequency division multiplexing is multi-tone modulation reduces long time delay spreads of acoustic channels. The interleave division multiple access distinguishes each user with the unique random interleaver code. The IDMA-OFDM is superior design for reducing error bursts in multi-access underwater applications. A Simulink based simulation modell of IDMA-OFDM system has been discussed in this paper. Satisfactory performance of the implementation was observed through analysis of BER with respect to SNR. The results have been concluded by comparing simulated data in BER tool of Simulink.Defence Science Journal, Vol. 65, No. 4, July 2015, pp. 307-311, DOI: http://dx.doi.org/10.14429/dsj.65.8606

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