On Limits of Wireless Communications in a Fading Environment when UsingMultiple Antennas
Wireless Personal Communications: An International Journal
WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
Layered space-time multiuser detection over wireless uplink systems
IEEE Transactions on Wireless Communications
Turbo frequency domain equalization for single-carrier broadband wireless systems
IEEE Transactions on Wireless Communications
An introduction to the multi-user MIMO downlink
IEEE Communications Magazine
Technical solutions for the 3G long-term evolution
IEEE Communications Magazine
IEEE Journal on Selected Areas in Communications
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QR decomposition-based near maximum likelihood 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, the 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 computational complexity and required storage size can be significantly reduced by the proposed scheme. Moreover, it improves the packet error rate performance and throughput performance significantly over the conventional bit-level log likelihood ratio packet combining, as shown by our computer simulation results. Copyright © 2012 John Wiley & Sons, Ltd.