TY - JOUR
T1 - Adaptive space-time diversity slotted ALOHA over 2 × m MIMO multiaccess channels
AU - Guo, Haiyou
AU - Hu, Honglin
AU - Zhang, Yan
AU - Chen, Hsiao Hwa
N1 - Funding Information:
Manuscript received August 3, 2008; revised February 18, 2009. First published March 6, 2008; current version published August 14, 2009. This work was supported in part by the Science and Technology Commission of Shanghai Municipality under Grant 08511500500 and in part by the Taiwan National Science Council under Grant 97-2219-E-006-004. The review of this paper was coordinated by Dr. S. Cui.
PY - 2009
Y1 - 2009
N2 - This paper proposes a new random-access protocol over 2 × M multiple-input-multiple-output (MIMO) multiaccess channels, namely, adaptive space-time diversity slotted ALOHA (ASTDSA), to address the issues on collision diversity while maintaining implementation simplicity. The proposed scheme exploits the advantages of both V-BLAST and Alamouti space-time block coding (STBC). In particular, it adaptively only transmits space-time-coded copies to remediable collisions. The coded replicas contain the same information as the packets involved in collisions and are immediately sent after a colliding slot. Combining the packets received in two consecutive slots, the Alamouti STBC scheme can be reconstructed to linearly resolve the collision without sacrificing the space-time diversity gain. An embedded Markov chain is developed to derive performance metrics with respect to throughput, diversity gain, delay, and stability. The tradeoff among those metrics is investigated. The results demonstrate that ASTDSA significantly outperforms the existing schemes, and simulations are used to validate the analytical model.
AB - This paper proposes a new random-access protocol over 2 × M multiple-input-multiple-output (MIMO) multiaccess channels, namely, adaptive space-time diversity slotted ALOHA (ASTDSA), to address the issues on collision diversity while maintaining implementation simplicity. The proposed scheme exploits the advantages of both V-BLAST and Alamouti space-time block coding (STBC). In particular, it adaptively only transmits space-time-coded copies to remediable collisions. The coded replicas contain the same information as the packets involved in collisions and are immediately sent after a colliding slot. Combining the packets received in two consecutive slots, the Alamouti STBC scheme can be reconstructed to linearly resolve the collision without sacrificing the space-time diversity gain. An embedded Markov chain is developed to derive performance metrics with respect to throughput, diversity gain, delay, and stability. The tradeoff among those metrics is investigated. The results demonstrate that ASTDSA significantly outperforms the existing schemes, and simulations are used to validate the analytical model.
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U2 - 10.1109/TVT.2009.2016975
DO - 10.1109/TVT.2009.2016975
M3 - Article
AN - SCOPUS:69549124220
SN - 0018-9545
VL - 58
SP - 3271
EP - 3282
JO - IEEE Transactions on Vehicular Technology
JF - IEEE Transactions on Vehicular Technology
IS - 7
ER -