Relay characteristic impact on energy consumption for heterogeneous networks in a LOS channel

Indoor heterogeneous wireless sensor networks are considered in this letter. We analyze the power consumption for multihop communications with non-regenerative relays that can only amplify the received signal without decoding and coding it. Since sensor nodes are usually battery operated so that energy consumption is a crucial issue, we determine the minimal consumption in the different configurations for a given quality of service. The important aspects of the work is that we propose a narrowband ricean propagation environment that varies with source-destination distance and take into account hardware aspects, and especially the relays' efficiency. We show not only that this characteristic has an important impact on the gain that multihop can bring, but also that in a few cases with a high impact on the consumption, the direct link is preferable to the two or three hops scenarios.

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