Chip-Level LMMSE Based HARQ Chase Combining for HSUPA

Author

Tolba, Mohamed Et ; Saoudi, Samir ; Visoz, Raphäel ; Ait-Idir, Tarik

Author_Institution

Technopole Brest-Iroise, Inst. TELECOM, Brest

fYear

2009

fDate

26-29 April 2009

Firstpage

1

Lastpage

5

Abstract

Hybrid automatic repeat request (HARQ) is one of the main technologies used in HSUPA system to increase the uplink data throughput. Chase combining (CC) and incremental redundancy (IR) are the most known HARQ algorithms. The first provides a time diversity, while the second offers a coding gain. In this paper, we propose a method to increase the chase combining efficiency. In this method, all HARQ transmissions are considered as additional receive antennas, and combined at the chip-level using a linear minimum mean square error (LMMSE). It is shown that with our approach, the Chase combining diversity gain is considerably increased especially in the case of high order modulation.

Keywords

3G mobile communication; automatic repeat request; code division multiple access; diversity reception; least mean squares methods; HARQ chase combining; HSUPA; additional receive antennas; chip-level LMMSE; coding gain; high speed uplink packet access; hybrid automatic repeat request; incremental redundancy; linear minimum mean square error method; time diversity; 3G mobile communication; Automatic repeat request; Diversity methods; Diversity reception; Equalizers; Fading; Multiaccess communication; Receiving antennas; Redundancy; Telecommunications;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2009. VTC Spring 2009. IEEE 69th

Conference_Location

Barcelona

ISSN

1550-2252

Print_ISBN

978-1-4244-2517-4

Electronic_ISBN

1550-2252

Type

conf

DOI

10.1109/VETECS.2009.5073441

Filename

5073441