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Underwater acoustic communication (UAC) system designers tend to transmit as much information as possible, per unit of time, at as low as possible error rate. It is a particularly difficult task in a shallow underwater channel in which the signal suffers from strong time dispersion due to multipath propagation and refraction phenomena. The direct-sequence spread spectrum technique (DSSS) applied successfully in the latest standards of wireless communications, gives the chance of reliable data transmission with an acceptable error rate in a shallow underwater channel. It utilizes pseudo-random sequences to modulate data signals, and thus increases the transmitted signal resilience against the inter symbol interference (ISI) caused by multipath propagation. This paper presents the results of simulation tests of DSSS data transmission with the use of different UAC channel models using binary spreading sequences.
The performance analysis of DS/SS system in single-tone interference is usually presented for AWGN channel. While, there usually exists fading over the actual wireless channels. Using the well-known MGF-based analysis approach, the exact symbol error rate of DS/SS system in single-tone interference over flat fading channel is derived in this paper, and the application conditions of two familiar performance analysis methods — standard Gaussian approximation and improved Gaussian approximation for DS/SS system in single-tone interference are discussed.
W artykule analizuje się wskaźnik błędu systemu telekomunikacyjnego DS/SS w kanale z zanikami przy jednotonowej interferencji. Do analizy wykorzystuje się metodę MGF. (Analiza dokładności systemu telekomunikacyjnego DS./SS z interferencją jednotonową w kanale z zanikami)
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