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Research Letters in Signal Processing
Volume 2009, Article ID 829585, 5 pages
Research Letter

Selective Decoding Scheme-MAC Protocol in Ad Hoc Networks with MIMO Links

Department of Electronic and Telecommunication Engineering, Faculty of Engineering, King Mongkut's University of Technology, Thonburi, Bangmod, Tungkru, Bangkok 10140, Thailand

Received 20 May 2009; Accepted 10 August 2009

Academic Editor: Andreas Jakobsson

Copyright © 2009 Raungrong Suleesathira et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A problem encountered in the IEEE 802.11 MAC is the collision of simultaneous transmissions from either neighboring nodes or hidden nodes within the same contention floor. This paper presents the selective decoding schemes in MAC (SDS-MAC) protocol for MIMO ad hoc networks. It is able to mitigate interferences by means of a minimum mean-squared error (MMSE) technique. As a result, it allows a pair of simultaneous transmissions to the same or different nodes to yield the network utilization increase. The decoding schemes and time line operations are properly selected corresponding to the transmission demand of neighboring nodes to avoid collision. Transmission demand can be determined by the number of RTS packets and type of CTS packets. Simulation results are given to illustrate the SDS-MAC performance.