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Sensors 2013, 13(10), 13382-13401; doi:10.3390/s131013382
Article

Adaptive Multi-Node Multiple Input and Multiple Output (MIMO) Transmission for Mobile Wireless Multimedia Sensor Networks

1
,
2
 and
3,*
1 Department of Computer Science and Engineering, Hanyang University, 55 Hanyangdaehak-ro,Sangnok-gu, Ansan, Gyeonggi-do 426-791, Korea 2 Department of Information and Communication Engineering, DGIST, 333 Techno jungang-daero, Hyeonpung-myeon, Dalsung-gun, Deagu 711-873, Korea 3 Department of Information and Communications Engineering, Myongji University, 116 Myongji-ro, Cheoin-gu, Yongin, Gyeonggi-do 449-728, Korea
* Author to whom correspondence should be addressed.
Received: 2 September 2013 / Revised: 25 September 2013 / Accepted: 26 September 2013 / Published: 2 October 2013
(This article belongs to the Section Physical Sensors)
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Abstract

Mobile wireless multimedia sensor networks (WMSNs), which consist of mobile sink or sensor nodes and use rich sensing information, require much faster and more reliable wireless links than static wireless sensor networks (WSNs). This paper proposes an adaptive multi-node (MN) multiple input and multiple output (MIMO) transmission to improve the transmission reliability and capacity of mobile sink nodes when they experience spatial correlation. Unlike conventional single-node (SN) MIMO transmission, the proposed scheme considers the use of transmission antennas from more than two sensor nodes. To find an optimal antenna set and a MIMO transmission scheme, a MN MIMO channel model is introduced first, followed by derivation of closed-form ergodic capacity expressions with different MIMO transmission schemes, such as space-time transmit diversity coding and spatial multiplexing. The capacity varies according to the antenna correlation and the path gain from multiple sensor nodes. Based on these statistical results, we propose an adaptive MIMO mode and antenna set switching algorithm that maximizes the ergodic capacity of mobile sink nodes. The ergodic capacity of the proposed scheme is compared with conventional SN MIMO schemes, where the gain increases as the antenna correlation and path gain ratio increase.
Keywords: mobile wireless multimedia sensor networks; multi-node MIMO; diversity; spatial correlation mobile wireless multimedia sensor networks; multi-node MIMO; diversity; spatial correlation
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.

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Cho, S.; Choi, J.-W.; You, C. Adaptive Multi-Node Multiple Input and Multiple Output (MIMO) Transmission for Mobile Wireless Multimedia Sensor Networks. Sensors 2013, 13, 13382-13401.

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