It is well known that decode and forward relaying protocols, in which the relays decode and re-encode the message, can achieve full diversity when combined with distributed space time coding or relay selection schemes. However, in wireless sensor networks, decoding and re-encoding the message at the relays can be costly due to severe energy limitations. A question arises: is it possible to achieve full diversity when the relays only detect (or demodulate) and forward the message? In this paper a distributed detection scheme is developed that achieves full diversity in wireless sensor network, with the relays only detecting and forwarding the message. It is seen that such a relaying scheme is SNR threshold-based, i.e., the relays will perform detection only if the receive SNR is above a certain threshold. The threshold that achieves full diversity is derived. Furthermore, a single bit feedback scheme is developed to make relaying more spectral efficient, such that the network can achieve the diversity-multiplexing tradeoff of a point-to-point multipleinput single-output (MISO) system in the high SNR regime.

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Conference 2008 42nd Asilomar Conference on Signals, Systems and Computers, ASILOMAR 2008
Fan, Y. (Yijia), Onat, F.A. (Furuzan Atay), Yanikömeroǧlu, H, & Poor, H.V. (H. Vincent). (2008). Threshold based distributed detection that achieves full diversity in wireless sensor networks. In Conference Record - Asilomar Conference on Signals, Systems and Computers (pp. 74–79). doi:10.1109/ACSSC.2008.5074365