An enhanced embedded-pilot channel estimation architecture for MIMO MC-CDMA systems

Marousis, AD; Skentos, ND; Constantinou, P

dc.contributor.author	Marousis, AD	en
dc.contributor.author	Skentos, ND	en
dc.contributor.author	Constantinou, P	en
dc.date.accessioned	2014-03-01T01:35:08Z
dc.date.available	2014-03-01T01:35:08Z
dc.date.issued	2011	en
dc.identifier.issn	0929-6212	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20973
dc.subject	Channel estimation	en
dc.subject	Embedded pilot	en
dc.subject	Iterative scheme	en
dc.subject	MIMO MC-CDMA	en
dc.subject	Superimposed code-multiplexed pilots	en
dc.subject	Virtual users	en
dc.subject.classification	Telecommunications	en
dc.subject.other	Adaptivity	en
dc.subject.other	Channel estimator	en
dc.subject.other	De-spreading	en
dc.subject.other	Dynamic assignment	en
dc.subject.other	Embedded pilots	en
dc.subject.other	Estimation process	en
dc.subject.other	Interference cancellation	en
dc.subject.other	Iterative schemes	en
dc.subject.other	Low overhead	en
dc.subject.other	MIMO MC-CDMA system	en
dc.subject.other	Modulation and coding schemes	en
dc.subject.other	Multi-carrier CDMA systems	en
dc.subject.other	Multi-user interference	en
dc.subject.other	Multiple transmit and receive antennas	en
dc.subject.other	Performance improvements	en
dc.subject.other	Propagation channels	en
dc.subject.other	Proposed architectures	en
dc.subject.other	Receive antenna	en
dc.subject.other	Semi-blind	en
dc.subject.other	Spatial diversity systems	en
dc.subject.other	Spreading codes	en
dc.subject.other	Subcarrier	en
dc.subject.other	Superimposed code-multiplexed pilots	en
dc.subject.other	System throughput	en
dc.subject.other	Time variant	en
dc.subject.other	Virtual users	en
dc.subject.other	Channel coding	en
dc.subject.other	Channel estimation	en
dc.subject.other	Computer aided software engineering	en
dc.subject.other	Embedded systems	en
dc.subject.other	Estimation	en
dc.subject.other	Multicarrier modulation	en
dc.subject.other	Multiplexing	en
dc.subject.other	Receiving antennas	en
dc.subject.other	Code division multiple access	en
dc.title	An enhanced embedded-pilot channel estimation architecture for MIMO MC-CDMA systems	en
heal.type	journalArticle	en
heal.identifier.primary	10.1007/s11277-010-9933-7	en
heal.identifier.secondary	http://dx.doi.org/10.1007/s11277-010-9933-7	en
heal.language	English	en
heal.publicationDate	2011	en
heal.abstract	In this work an enhanced semi-blind channel estimator is presented for multicarrier CDMA systems with multiple transmit and receive antennas. The novel scheme is based on embedded pilots that are characterized as virtual users and their number is determined in a dynamic fashion according to the propagation channel conditions. The superimposed code-multiplexed pilots are used initially for channel estimation before the despreading operation, thus achieving per subcarrier estimation using the known unique multi-layer pattern of the virtual users. Afterwards, the estimation is enhanced by using the despread pilots. Furthermore, an iterative scheme is incorporated in channel estimation process minimizing the effect of multiuser interference and operates either in interference cancellation, or in virtual user mode. The proposed architecture is evaluated for spatial diversity systems (space- frequency block coded) with two transmit and up to four receive antennas operating in realistic propagation channels for various modulation and coding schemes. The results demonstrate a significant performance improvement especially as the channel is dominated by its time variant characteristics. The dynamic assignment of spreading codes in the payload and the pilots offers to the system realistic flexibility and adaptivity in demanding channels achieving concurrently maximization of the real overall system throughput, while maintaining low overhead and complexity burden. © 2010 Springer Science+Business Media, LLC.	en
heal.publisher	WILEY-BLACKWELL	en
heal.journalName	Wireless Personal Communications	en
dc.identifier.doi	10.1007/s11277-010-9933-7	en
dc.identifier.isi	ISI:000293285300010	en
dc.identifier.volume	59	en
dc.identifier.issue	4	en
dc.identifier.spage	713	en
dc.identifier.epage	739	en