Abstract
With recent developments in terrestrial wireless networks and advances in acoustic communications, multichannel technologies have been proposed to be used in underwater networks to increase data transmission rate over bandwidth-limited underwater channels. Due to high bit error rates in underwater
Highlights
Underwater sensor networks will play an important role in fulfilling enhanced capability of maritime situational awareness and response in coastal waters
Motivated by the approaches applied to logical link control (LLC) designs for terrestrial wireless networks, in this paper we describe a multichannel underwater sensor network system, where each transmitter-receiver pair will be connected by a generic number of forward channels
We plot the simulation results of the average packet delay for the selective-repeat automatic repeat request (SR-ARQ) based LLC with the dynamic and static channel scheduling in Figure 5, Figure 6, and Figure 7. From these plots we observe that the dynamic channel scheduling improves the packet delay performance in multichannel underwater sensor network environments over the static channel scheduling
Summary
Underwater sensor networks will play an important role in fulfilling enhanced capability of maritime situational awareness and response in coastal waters. A multiple-input multiple-output antennas (MIMO) system uses multiple channels consisting of distinct antenna pairs [4], while orthogonal frequency division multiplexing (OFDM) applies disjoint frequency bands to form multiple channels [5, 6] Both technologies have been used in wireless network standards such as WiMax (IEEE 802.16) [7] and LTE (3GPP Long Term Evolution) [8]. In the proposed cross-layer design, a dynamic packet-tochannel scheduling policy takes advantage of the channel state information and is combined with a SRARQ based error control scheme to provide improved network performance. The proposed protocol stack architecture uses a SR-ARQ based design at the logical link control sublayer, can make the channel state information available at the sublayer via cross-layer design.
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