Recursive QR packet combining for uplink single-carrier multi-user MIMO HARQ using near ML detection

Tetsuya Yamamoto, Koichi Adachi, Sumei Sun, Fumiyuki Adachi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

QR decomposition based near maximum likelihood (ML) block detection significantly improves the transmission performance of uplink single-carrier (SC) multi-user multiple-input multiple-output (MU-MIMO). Hybrid automatic repeat request (HARQ) is an indispensable error control technique for high quality packet data transmission. The achievable diversity gain of HARQ depends on the packet combining strategy. In uplink MU-MIMO HARQ, received signal may consist of new packets and retransmitted packets as retransmission for each user acts independently. In this paper, a recursive QR packet combining scheme suitable for uplink SC MU-MIMO HARQ is proposed, which takes into account the number of retransmissions for each user in the detection order. The proposed scheme helps reduce the computational complexity and storage requirement significantly. Moreover, it improves the packet error rate (PER) performance significantly over the conventional bit-level log likelihood ratio (LLR) packet combining, as shown by our computer simulation results.

Original languageEnglish
Title of host publicationIWCMC 2012 - 8th International Wireless Communications and Mobile Computing Conference
Pages407-412
Number of pages6
DOIs
Publication statusPublished - 2012 Nov 22
Event8th IEEE International Wireless Communications and Mobile Computing Conference, IWCMC 2012 - Limassol, Cyprus
Duration: 2012 Aug 272012 Aug 31

Publication series

NameIWCMC 2012 - 8th International Wireless Communications and Mobile Computing Conference

Other

Other8th IEEE International Wireless Communications and Mobile Computing Conference, IWCMC 2012
CountryCyprus
CityLimassol
Period12/8/2712/8/31

Keywords

  • HARQ
  • M-algorithm
  • MU-MIMO
  • QR decomposition
  • Single-carrier
  • packet combining

ASJC Scopus subject areas

  • Computer Networks and Communications

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