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Rotated Walsh-Hadamard Spreading with Robust Channel Estimation for a Coded MC-CDMA System

Raulefs, R. und Dammann, A. und Sand, S. und Kaiser, S. und Auer, G. (2004) Rotated Walsh-Hadamard Spreading with Robust Channel Estimation for a Coded MC-CDMA System. EURASIP Journal on Wireless Communications and Networking - Special Issue on Innovative SignalTransmission and Detection Techniques for Next Generation Cellular CDMA Systems, Vol. 2004 (No. 1), Seiten 74-83.

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Kurzfassung

We investigate rotated Walsh-Hadamard spreading matrices for a broadband MC-CDMA system with robust channel estimation in the synchronous downlink. The similarities between rotated spreading and signal space diversity are outlined. In a multiuser MC-CDMA system, possible performance improvements are based on the chosen detector, the channel code, and its Hamming distance. By applying rotated spreading in comparison to a standard Walsh-Hadamard spreading code, a higher throughput can be achieved. As combining the channel code and the spreading code forms a concatenated code, the overall minimum Hamming distance of the concatenated code increases. This asymptotically results in an improvement of the bit error rate for high signal-to-noise ratio. Higher convolutional channel code rates are mostly generated by puncturing good low-rate channel codes. The overall Hamming distance decreases significantly for the punctured channel codes. Higher channel code rates are favorable for MC-CDMA, as MC-CDMA utilizes diversity more efficiently compared to pure OFDMA. The application of rotated spreading in an MC-CDMA system allows exploiting diversity even further. We demonstrate that the rotated spreading gain is still present for a robust pilot-aided channel estimator. In a well-designed system, rotated spreading extends the performance by using a maximum likelihood detector with robust channel estimation at the receiver by about 1 dB.

Dokumentart:Zeitschriftenbeitrag
Zusätzliche Informationen: LIDO-Berichtsjahr=2005,
Titel:Rotated Walsh-Hadamard Spreading with Robust Channel Estimation for a Coded MC-CDMA System
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Raulefs, R.NICHT SPEZIFIZIERT
Dammann, A.NICHT SPEZIFIZIERT
Sand, S.NICHT SPEZIFIZIERT
Kaiser, S.NICHT SPEZIFIZIERT
Auer, G.DoCoMo Eurolabs Germany
Datum:2004
Erschienen in:EURASIP Journal on Wireless Communications and Networking - Special Issue on Innovative SignalTransmission and Detection Techniques for Next Generation Cellular CDMA Systems
Referierte Publikation:Ja
In ISI Web of Science:Ja
Band:Vol. 2004
Seitenbereich:Seiten 74-83
Status:veröffentlicht
Stichwörter:code division multiaccess, Walsh-Hadamard spreading sequences, multicarrier, fading channels, concatenated channel coding
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W KN - Kommunikation/Navigation
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W KN - Kommunikation/Navigation
DLR - Teilgebiet (Projekt, Vorhaben):NICHT SPEZIFIZIERT
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Kommunikation und Navigation
Hinterlegt von: elib DLR-Beauftragter
Hinterlegt am:16 Sep 2005
Letzte Änderung:06 Jan 2010 21:42

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