Lifetime improvement in wireless sensor networks via collaborative beamforming and cooperative transmission

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31 Scopus citations


Collaborative beamforming (CB) and cooperative transmission (CT) have recently emerged as communication techniques that can make effective use of collaborative/cooperative nodes to create a virtual multiple-input/multiple- output system. Extending the lifetime of networks composed of battery-operated nodes is a key issue in the design and operation of wireless sensor networks. The effects on network lifetime of allowing closely located nodes to use CB/CT to reduce the load or even to avoid packet-forwarding requests to nodes that have critical battery life are considered. First, the effectiveness of CB/CT in improving the signal strength at a faraway destination using energy in nearby nodes is studied. Then, the performance improvement obtained by this technique is analysed for a special 2D disc case. Further, for general networks in which information-generation rates are fixed, a new routing problem is formulated as a linear-programming problem, whereas for other general networks, the cost for routing is dynamically adjusted according to the amount of energy remaining and the effectiveness of CB/CT. From the analysis and the simulation results, it is seen that the proposed method can reduce the payloads of energy-depleting nodes by about 90 in the special case network considered and improve the lifetimes of general networks by about 10, compared with existing techniques.

Original languageEnglish (US)
Pages (from-to)1103-1110
Number of pages8
JournalIET Microwaves, Antennas and Propagation
Issue number6
StatePublished - 2007

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering


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