Chip-level HARQ chase combining for HSUPA

Authors:
Mohamed Et Tolba;Samir Saoudi;Raphaël Visoz;Tarik Ait-Idir
Affiliations:
Lab-STICC, Institut Telecom, Telecom Bretagne, UMR CNRS 3192 Lab-STICC, Technopôle Brest-Iroise, Brest Cedex 3, France and TELECOM Bretagne institution, Université européenne de Bre ...;Lab-STICC, Institut Telecom, Telecom Bretagne, UMR CNRS 3192 Lab-STICC, Technopôle Brest-Iroise, Brest Cedex 3, France and TELECOM Bretagne institution, Université européenne de Bre ...;Orange Labs, Issy Moulineaux Cedex 9, France;Communication Systems Department, Institut National des Postes et Télécommunications, Rabat, Morocco
Venue:
Research Letters in Communications
Year:
2009

Citing 1
Cited 1

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Cooperative chip-level HARQ-chase combining for the 3GPP enhanced uplink system

ISWPC'10 Proceedings of the 5th IEEE international conference on Wireless pervasive computing

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Abstract

Hybrid automatic repeat request (HARQ) is used in high-speed uplink packet access (HSUPA) to increase the data rate. Chase combining is the simplest of HARQ algorithms. It provides a time diversity and requires a small memory. In this paper, we propose a technique to increase the chase combining efficiency. In this method, HARQ transmissions are seen as additional receive antennas which are jointly combined at chip-level using a space-time linear minimum square error (LMMSE). We demonstrate that the chase combining diversity gain is considerably increased especially for high-order modulation.