Improving control performance across AWGN channels using a relay node

Utsaw Kumar, Jie Liu, Vijay Gupta and J. Nicholas Laneman

International Journal of Systems Science, 2014, vol. 45, issue 7, 1579-1588

Abstract: Consider an unstable linear time-invariant system in which the sensor transmits information to a controller across an additive white Gaussian noise channel. The designer can optionally utilise a relay node to assist the controller; however, the total transmission power consumed by the sensor and the relay node is constant. We consider two topologies: (1) a Gaussian relay channel and (2) a cascade of two Gaussian point-to-point channels. We propose coding schemes and present sufficient conditions for the stabilisability of the plant through such schemes. The analysis suggests that it is useful to utilise a relay node, even if the total transmission power remains the same.

Date: 2014
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DOI: 10.1080/00207721.2013.876683

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