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Title: A cooperative retransmission scheme in wireless networks with imperfect channel state information
Authors: Shirazi, G.N.
Kong, P.-Y. 
Tham, C.-K. 
Issue Date: 2009
Citation: Shirazi, G.N.,Kong, P.-Y.,Tham, C.-K. (2009). A cooperative retransmission scheme in wireless networks with imperfect channel state information. IEEE Wireless Communications and Networking Conference, WCNC : -. ScholarBank@NUS Repository.
Abstract: A transmitted packet that fails to reach its intended destination may be correctly received by neighbor nodes due to the broadcast nature of the wireless medium. In a cooperative retransmission scheme, these neighbor nodes, known as relays, can retransmit the failed packet on behalf of the original source node. The challenge is that multiple concurrent transmissions may lead to collision at the destination, and thus the problem is to decide which relay should help in retransmitting the failed packet so that the destination can successfully receive it. This paper proposes a decentralized partially observable Markov decision process (DEC-POMDP) model for selecting the relays to perform the cooperative retransmission. The proposed DECPOMDP model does not require global channel state information (CSI). In addition, it is robust to noise in CSI measurements. Furthermore, the proposed DEC-POMDP scheme utilizes the gradient descent learning method to eliminate the need for a wireless channel model. We show that the proposed learning method based on the DEC-POMDP model can perform near optimally in the absence of a channel model and despite its implementation simplicity. © 2009 IEEE.
Source Title: IEEE Wireless Communications and Networking Conference, WCNC
ISBN: 9781424429486
ISSN: 15253511
DOI: 10.1109/WCNC.2009.4917494
Appears in Collections:Staff Publications

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