EURASIP Journal on Applied Signal Processing
Volume 2004 (2004), Issue 5, Pages 772-782
doi:10.1155/S1110865704311042
Abstract
We propose a new automatic repeat request (ARQ) scheme
for MIMO systems with multiple transmit and receive antennas. The
substreams emitted from various transmit antennas encounter
distinct propagation channels and thus have different error
statistics. When per-antenna encoders are used, separating ARQ
processes among the substreams results in a throughput
improvement. Moreover, it facilitates the interference
cancellation in certain MIMO techniques. Quantitative results
from UMTS simulations demonstrate that the proposed multiple ARQ
structure yields more than 30% gain in link throughput.