A Study on Energy Consumption Optimization for Cooperative Beamforming in Wireless Sensor Networks

Abstract:

In wireless sensor networks where the volume and energy of nodes are limited by batteries, which are difficult or prohibitively expensive to replace or recharge in the most of its application scenarios, so improving energy efficiency has very important significance.Cooperative beamforming forms virtual antenna arrays by multiple adjacent wireless sensor nodes, which improves the signal strength at the receiver and reduces the energy consumption of the transmitter by multiplexing gain and interference management.In this paper, the problem of energy consumption optimization for cooperative beamforming in wireless sensor networks was studied. First, considering both amplifier energy consumption and circuit energy consumption,energy consumption models for both broadcast phase and cooperative beamforming phase was presented.Then,we propose a two-step optimization to minimize the total energy consumption by optimizing the modulation parameter and the number of cooperative nodes.We simulate the total energy consumption for various transmission distances,modulation parameters , path losses and the number of cooperative nodes.The numerical results show that,for different system parameters, selecting the optimal modulation parameter and the optimal number of cooperative nodes can reduce total energy consumption and improve energy efficiency.

• Periodical: Key Engineering Materials (Volume 620)
• Pages: 625-631
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.620.625
• Online since: August 2014
• Authors: Guang You Yang*, Xiong Gan, Tuo Zheng, Zhi Yan Ma
• Keywords: Cooperative Beamforming, Energy Consumption Optimization, Wireless Sensor Network (WSN)

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