Abstract
Cooperative communication in wireless sensor network (WSN) explores the energy efficient wireless communication schemes between multiple sensors and data gathering node (DGN) by exploiting multiple input multiple output (MIMO) and multiple input single output (MISO) configurations. In this paper, an energy efficient cooperative MIMO (C-MIMO) technique is proposed where low density parity check (LDPC) code is used as an error correcting code. The rate of LDPC code is varied by varying the length of message and parity bits. Simulation results show that the cooperative communication scheme outperforms SISO scheme in the presence of LDPC code. LDPC codes with different code rates are compared using bit error rate (BER) analysis. BER is also analyzed under different Nakagami fading scenario. Energy efficiencies are compared for different targeted probability of bit error pb. It is observed that C-MIMO performs more efficiently when the targeted pb is smaller. Also the lower encoding rate for LDPC code offers better error characteristics.
Highlights
Recent advances in micro-electro-mechanical systems technology have enabled the development of wireless sensor nodes in a wireless sensor network (WSN)
C-multiple input multiple output (MIMO) is a kind of MIMO technique where the multiple inputs and outputs are formed via cooperation in a network of single antenna nodes
low density parity check (LDPC) code is considered in this paper as an Error control coding (ECC) tool at WSN for its superior error correcting capabilities
Summary
Recent advances in micro-electro-mechanical systems technology have enabled the development of wireless sensor nodes in a wireless sensor network (WSN). These tiny sensor nodes are able to sense, process and communicate with each other [1,2]. C-MIMO is a kind of MIMO technique where the multiple inputs and outputs are formed via cooperation in a network of single antenna nodes. To the best knowledge of the authors, there has been no document on the implementation of LDPC encoder/decoder in a wireless sensor node using cooperative communication. LDPC code is incorporated in cooperative communication as an error control code.
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