Abstract
Wireless sensor networks consist of resource limited devices. Most crucial of these resources is battery life, as in most applications like battle field or volcanic area monitoring, it is often impossible to replace or recharge the power source. This article presents an energy efficient collaborative communication system based on spread spectrum to achieve energy efficiency as well as immunity against jamming, natural interference, noise suppression and universal frequency reuse. Performance of the proposed system is evaluated using the received signal power, bit error rate (BER) and energy consumption. The results show a direct proportionality between the power gain and the number of collaborative nodes as well as BER and signal-to-noise ratio (Eb/N0). The analytical and simulation results of the proposed system are compared with SISO system. The comparison reveals that SISO perform better than collaborative communication in case of small distances whereas collaborative communication performs better than SISO in case of long distances. On the basis of these results it is safe to conclude that collaborative communication in wireless sensor networks using wideband systems improves the life time of nodes in the networks thereby prolonging the network’s life time.
Highlights
The resource limited nature of sensor networks make the power source of a sensor node very crucial resource
This paper presents collaborative communication model for wireless sensor networks using Rayleigh fading and wideband channels to achieve energy efficient communication
The analysis is performed through a comparison between analytical and simulated results using received power, bit error rate and energy consumption as figures of merit
Summary
The resource limited nature of sensor networks make the power source of a sensor node very crucial resource. As a problem statement; for a given “N” number of collaborative transmitter nodes which transmit the same information to a common receiver (BS), this paper strive to design an energy efficient algorithm using collaborative communication in combination with wideband channels including the effect of AWGN noise and Rayleigh fading. Contribution(s) of this article are, a) derivation of mathematical model for collaborative communication (power gain, BER and energy consumption) with imperfect phase synchronization based on spread spectrum with noise and fading. F) The use of spread spectrum approach to mitigate the effect of noise, reduce natural as well as inter symbol interference and transmit information at even low power and single frequency so that it is immune to interference, jamming and eavesdropping This model avoid interference and noise thereby decreasing the number of bits in error. Results and discussion section presents an analysis of the proposed system whereas conclusion section conclude the article
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