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Relay Selection for Low-Complexity Coded Cooperation

Summary: Relay Selection for Low-Complexity
Coded Cooperation
Josephine P. K. Chu, Raviraj S. Adve and Andrew W. Eckford
Dept. of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, Canada
Dept. of Computer Science and Engineering, York University, Toronto, Ontario, Canada
E-mail: {chuj,rsadve}@comm.utoronto.ca, aeckford@yorku.ca
Abstract-- This paper explores relay selection and selection
diversity for coded cooperation in wireless sensor networks, with
complexity constraints for the sensor nodes. In previous work,
a relaying scheme based on repeat-accumulate (RA) codes was
introduced, where the relay is assumed incapable of decoding the
received signal's error-correcting code, and simply uses demodu-
lated bits to form codewords. However, in a network setting with
multiple potential relays where relays do not decode the source
transmission, it is not obvious how to select the best relay. The
optimal choice involves the source-relay, relay-destination, and
source-destination channels. In this paper, optimal relay selection
is discussed, and is shown to be impractical for low-complexity
sensor nodes. However, it is shown that the mutual information
of the equivalent relay channel is a good selection heuristic. The


Source: Adve, Raviraj - Department of Electrical and Computer Engineering, University of Toronto


Collections: Engineering