Adaptive Multiuser MCDM for Underwater Acoustic Communications
Song-Wen Huang, Dimitris A. Pados

TL;DR
This paper introduces an adaptive multiuser multicarrier chirp-division multiplexing system for underwater acoustic communications, enhancing performance and supporting multiple users through novel chirp-based modulation and adaptive strategies.
Contribution
It proposes a new MU-MCDM system with orthogonal chirp spread spectrum, develops OCT and DOCT for implementation, and designs an ML receiver for synchronization and detection in UW-A channels.
Findings
Improved BER performance in simulations.
Supports multiple users adaptively.
Potential for higher data rates with higher order modulations.
Abstract
Chirp signals have been exploited extensively in radar and underwater acoustic (UW-A) communication systems for their robustness to multipath and superior correlation properties. We present a multiuser multicarrier chirp-division multiplexing (MU-MCDM) system which orthogonal chirp spread spectrum are utilized in frequency subcarriers for multiuser applications. Furthermore, orthogonal chirp transform (OCT) and discrete orthogonal chirp transform (DOCT) are developed for continuous and discrete implementations of MCDM systems. In addition, we design a maximum likelihood (ML) receiver capable of synchronization, channel estimation, and symbol detection. MU-MCDM systems consider factors, including preamble length, number of subcarriers, portion of pilots, guard period, and multiuser access scenarios to adapt time-variant UW-A channels. The bit-error-rate (BER) performance and adaptive…
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Taxonomy
TopicsUnderwater Vehicles and Communication Systems · Radar Systems and Signal Processing · Underwater Acoustics Research
