Table of Contents
Sensors, Volume 18, Issue 2 (February 2018) – 362 articles
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Cover Story (view full-size image) Pec and co-workers report a random access preamble (RAP) design technique for underwater acoustic [...] Read more. Pec and co-workers report a random access preamble (RAP) design technique for underwater acoustic cellular systems. After showing that the conventional RAP used in long term evolution (LTE) systems is not appropriate for underwater acoustic cellular systems, two different types of RAPs (RAP 1 and RAP 2) are proposed to detect the identity of underwater equipment/nodes (UE) and estimate the time delay between a UE and an underwater base station at the physical layer. The performance of RAP detection is investigated by analyzing the detection probabilities and false alarm probabilities of RAP 1 and RAP 2 in a Doppler environment. By evaluating the performances of RAP 1 and RAP 2 in various situations, it was concluded that RAP 2 is more suitable for underwater acoustic cellular systems. The AF and CAF analytically obtained in this paper are shown to be similar to those obtained using experimental data. View this paper