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Multicarrier code division multiple access (MC-CDMA) technique for underwater acoustic communication networks using short spreading sequences

Multicarrier code division multiple access (MC-CDMA) technique for underwater acoustic communication networks using short spreading sequences

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Code division multiple access (CDMA) techniques have recently been utilised to achieve reliable multiuser communication in asynchronous shallow water acoustic networks. The authors consider this type of communication technique, which has its origins in spread spectrum principles. The performance of multicarrier (MC) CDMA for short length complex spreading sequences, which demonstrate both good cross-correlation and auto-correlation properties, has been evaluated by means of computer simulations. In MC-CDMA, a set of carrier frequencies is employed to achieve frequency diversity. The proposed adaptive receiver architectures integrate the functions of despreading, multi-access and narrowband interference cancellation, equalisation, and phase-carrier tracking. Results show the effectiveness of the system in a rapidly time-varying, frequency-selective channel.

Inspec keywords: sequences; correlation methods; underwater acoustic communication; time-varying channels; code division multiple access; spread spectrum communication; interference suppression; acoustic receivers

Other keywords: cross-auto correlation; narrowband interference cancellation; frequency diversity; adaptive receiver architectures; carrier frequencies; MC-CDMA; multicarrier code division multiple access technique; asynchronous shallow water acoustic networks; multiuser communication; short spreading sequences; frequency-selective channel; underwater acoustic communication networks; spread spectrum principles

Subjects: Acoustic and other telecommunication systems and equipment; Multiple access communication

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