Compound compensation strategies for wireless data communications over the multimodal acoustic ocean waveguide

Bessios, AG

dc.contributor.author	Bessios, AG	en
dc.date.accessioned	2014-03-01T01:44:40Z
dc.date.available	2014-03-01T01:44:40Z
dc.date.issued	1996	en
dc.identifier.issn	03649059	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/24450
dc.subject.other	Acoustic signal processing	en
dc.subject.other	Adaptive filtering	en
dc.subject.other	Carrier communication	en
dc.subject.other	Communication channels (information theory)	en
dc.subject.other	Computational complexity	en
dc.subject.other	Electric network topology	en
dc.subject.other	Frequency response	en
dc.subject.other	Green's function	en
dc.subject.other	Intersymbol interference	en
dc.subject.other	Local area networks	en
dc.subject.other	Modulation	en
dc.subject.other	Waveguides	en
dc.subject.other	Blind adaptive equalization	en
dc.subject.other	Multicarrier modulation	en
dc.subject.other	Multimodal acoustic ocean waveguides	en
dc.subject.other	Single carrier transmission rate	en
dc.subject.other	Underwater acoustic communications	en
dc.subject.other	Wireless data communications	en
dc.subject.other	Data communication systems	en
dc.title	Compound compensation strategies for wireless data communications over the multimodal acoustic ocean waveguide	en
heal.type	journalArticle	en
heal.identifier.primary	10.1109/48.486792	en
heal.identifier.secondary	http://dx.doi.org/10.1109/48.486792	en
heal.publicationDate	1996	en
heal.abstract	Underwater acoustic communications (UAC) at the reverberation-limited range results in severely distorted information signals. Wide-band signals are subject to both intermodal and intramodal-type of dispersions. The underwater acoustic channel impulse response and the sidelobes strongly depend on the waveguide structure and the source and receiver positions. The motion and displacement from this position, as well as other environmental variabilities impose a real-time adaptivity for the receiver operation to keep track of the fluctuations. To increase the system's reliability and data rate, there is a need to employ adaptive equalizers and diversity techniques to improve the margins against noise, and intersymbol interference (ISI). Blind adaptive equalization (BAE) is the ideal adaptive compensation when operating point-to-multipoint network, and centralized communication systems in general. Inherent optimum Multiple resonant modes within the ocean acoustic waveguide can be exploited judiciously via a new proposed parallel data multicarrier modulation (MCM) scheme by sending data over the multiple subcarriers. MCM might eventually obviate equalization which introduces higher-order computational complexity to the receiver. The above modulation eliminates multipaths and allows operation at multiples of the single-carrier transmission rate. The system's immunity to distortions such as ISI, fast fades, and impulsive noises, is increased due to incorporation of symbol guard space. Direct comparisons with single carrier schemes (such as higher-order statistics (HOS)-based equalization) are of great interest, since the proposed new receiver configuration has low-complexity to provide a compact, portable and low-power practical acoustic modem. Finally, network topology issues are considered to determine optimum network architectures for underwater acoustic LAN's. A central topology (CT) supported by BAE and MCM transmission is proposed conclusively.	en
heal.journalName	IEEE Journal of Oceanic Engineering	en
dc.identifier.doi	10.1109/48.486792	en
dc.identifier.volume	21	en
dc.identifier.issue	2	en
dc.identifier.spage	167	en
dc.identifier.epage	180	en