Title :
Strategies for ARQ in 2x2 MIMO Systems
Author :
de Carvalho, Elisabeth ; Popovski, Petar
Author_Institution :
Dept. of Electron. Syst., Aalborg Univ., Aalborg
fDate :
6/1/2008 12:00:00 AM
Abstract :
Packet retransmission strategies are presented for 2x2 MIMO spatial multiplexing systems. Antennas for retransmission are selected to maximize an approximation of the throughput of the system. A sign change or conjugate operation is allowed for retransmitted packets. The proposed scheme performs selection of retransmission antennas based on the CSI at the receiver: only 1 bit of feedback is additionally required, along with the acknowledgement bits. When 2 packets are decoded with errors, retransmission follows a space time block code structure, allowing a seamless switching between spatial multiplexing and space time block coding.
Keywords :
MIMO systems; automatic repeat request; block codes; multiplexing; receiving antennas; space-time codes; MIMO spatial multiplexing systems; automatic repeat request; packet retransmission; retransmission antennas; sign change; space time block coding; Automatic repeat request; Block codes; Decoding; Feedback; MIMO; Modulation coding; Packet switching; Samarium; Throughput; Transmitting antennas;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2008.080259
