Skip to content


  • Research Article
  • Open Access

Multiple ARQ Processes for MIMO Systems

EURASIP Journal on Advances in Signal Processing20042004:479713

  • Received: 4 December 2002
  • Published:


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.

Keywords and phrases

  • MIMO systems
  • automatic repeat request
  • throughput
  • wireless communication
  • UMTS

Authors’ Affiliations

Wireless Research Laboratory, Lucent Technologies, 791 Holmdel-Keyport Road, Holmdel, NJ 07733, USA


© Zheng et al. 2004