Chip‐Level HARQ Chase Combining for HSUPA

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 eff...

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Bibliographic Details
Published in:Journal of electrical and computer engineering 2009-01, Vol.2009 (1)
Main Authors: Et Tolba, Mohamed, Saoudi, Samir, Visoz, Raphaël, Ait-Idir, Tarik
Format: Article
Language:English
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Summary: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.
ISSN:2090-0147
2090-0155
DOI:10.1155/2009/230276