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In this paper, a time varying Doppler-shift compensation scheme for wideband orthogonal frequency division multiplexing (OFDM) suitable for shallow water communications is proposed. This scheme accommodates a channel model having velocity that accelerate and de-accelerate during a packet of multiple OFDM frames. Furthermore, it assumes that the Doppler-shift varies linearly during the symbol time...
An iterative receiver scheme combining decision feedback equalizer (DFE) and bit interleaved coded modulation (BCIM-ID), suitable for transmission over frequency selective channels with large delay spread is proposed, where adaptive equalization and channel decoding are jointly optimized. Extensive simulation results presented for a realistic underwater time varying multipath channel exhibiting multipath...
Many applications exist whereby it would be useful to communicate into or out of conducting enclosures such as pipelines, storage containers or the compartments formed by the hull and bulkheads of a naval vessel. To maintain the structural integrity or simply for ease of use it is often not desirable to break the wall of the enclosure, preventing any hard-wired solution. The conducting nature of the...
Broadband fixed wireless access (BFWA) systems enable services such as high-speed data communication, high quality voice/video conferencing and high-speed internet access in areas where a wired link is not possible. However, the BFWA channel is a slow-fading channel having deep frequency-selective fading caused by clusters of scatterers in the environment that introduce inter-symbol interference (ISI)...
The focus of this paper is concentrated on the design of an adaptive RAKE receiver design for spread-spectrum based communications in shallow water acoustic channels. The objective is to exploit the multipath profile and to combine, rather than cancel, the energy arriving at the receiver via bottom and surface reflections. The optimisation of the receiver parameters such as filter weights and phase...
Despite the rapidly reducing cost of DSP technology and other digital electronics, the cost of multibeam sonar systems remains very high. This is largely due to large receiving arrays (typically 100-200 channels) each with transducer, amplifier/filters and ADC. The power consumption of such complex systems is also a problem for battery operated systems such as AUVs. This paper describes novel work...
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