Iterative joint time-variant channel estimation and multi-user detection for MC-CDMA

Beitrag in einer Fachzeitschrift
(Originalarbeit)


Details zur Publikation

Autor(en): Zemen T, Mecklenbräuker CF, Wehinger J, Müller R
Zeitschrift: IEEE Transactions on Wireless Communications
Verlag: Institute of Electrical and Electronics Engineers (IEEE)
Jahr der Veröffentlichung: 2006
Band: 5
Heftnummer: 6
Seitenbereich: 1469-1478
ISSN: 1536-1276


Abstract


Joint time-variant channel estimation and multiuser detection are key building-blocks for wireless broadband communication for mobile users at vehicular speed. We propose an iterative receiver for a multi-carrier (MC) code division multiple access (CDMA) system in the uplink. Multi-user detection is implemented through iterative parallel interference cancelation and conditional linear minimum mean square error (MMSE) filtering. MC-CDMA is based on orthogonal frequency division multiplexing (OFDM), thus time-variant channel estimation can be performed for every subcarrier individually. The variation of a subcarrier over the duration of a data block is upper bounded by the maximum Doppler bandwidth which is determined by the maximum velocity of the users. We exploit results from the theory of time-concentrated and bandlimited sequences and apply a Slepian basis expansion for time-variant subcarrier estimation. This approach enables time-variant channel estimation without complete knowledge of the second-order statistics of the fading process. The square bias of the Slepian basis expansion is one order of magnitude smaller compared to the Fourier basis expansion. The square bias of the basis expansion is the determining factor for the performance of the iterative joint channel estimation and data detection. We present an iterative linear MMSE estimation algorithm for the basis expansion coefficients in a multi-user system. The consistent performance of the iterative receiver using the Slepian basis expansion is validated by simulations for a wide range of velocities. © 2006 IEEE.


FAU-Autoren / FAU-Herausgeber

Müller, Ralf Prof. Dr.-Ing.
Professur für Informationsübertragung


Autor(en) der externen Einrichtung(en)
Intel GmbH
Technische Universität Wien


Zitierweisen

APA:
Zemen, T., Mecklenbräuker, C.F., Wehinger, J., & Müller, R. (2006). Iterative joint time-variant channel estimation and multi-user detection for MC-CDMA. IEEE Transactions on Wireless Communications, 5(6), 1469-1478. https://dx.doi.org/10.1109/TWC.2006.1638667

MLA:
Zemen, Thomas, et al. "Iterative joint time-variant channel estimation and multi-user detection for MC-CDMA." IEEE Transactions on Wireless Communications 5.6 (2006): 1469-1478.

BibTeX: 

Zuletzt aktualisiert 2018-12-12 um 14:23