Performance of multi-hop CDMA wireless sensor networks with correlated interferers using different retransmission strategies and error control schemes

Energy efficient reliable communication is a major challenge for resource constrained wireless sensor networks WSNs. This paper evaluates the end-to-end performance of a CDMA-based static multi-hop WSN with layered architecture in shadowed environment. Two popular information delivery mechanisms with error control are considered. End-to-end error correction and control using HARQ-type I with Bose Chaudhuri Hocquenghem BCH coding is considered, where BCH decoding is used only at the sink which has enough power to run the complex decoding algorithm. Performance of the network system using hop by hop ARQ mechanism at every intermediate node is also compared with that of end-to-end error control scheme. An interference model for multi-hop is presented considering correlation amongst shadow faded interferers. Energy requirement, and delay for successful delivery of a data packet from a source to sink is evaluated for each packet transmission scheme considering a suitable energy model and compared under several conditions of node density, packet length, number of hops between source and sink. Further energy efficiency for each scheme is evaluated and compared. Analytical results are supported by simulation.

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