Ghani Anwar, Naqvi Husnain, Sher Muhammad, Khan Muazzam Ali, Khan Imran, Irshad Azeem
Department of Computer Science & Software Engineering, International Islamic University, Islamabad, Pakistan.
NUST College of EME, National University of Science & Technology, Islamabad, Pakistan.
PLoS One. 2016 Jul 22;11(7):e0159069. doi: 10.1371/journal.pone.0159069. eCollection 2016.
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.
无线传感器网络由资源受限的设备组成。这些资源中最关键的是电池寿命，因为在诸如战场或火山区域监测等大多数应用中，通常无法更换或充电电源。本文提出了一种基于扩频的节能协作通信系统，以实现能源效率以及抗干扰、抗自然干扰、噪声抑制和通用频率复用的能力。使用接收信号功率、误码率（BER）和能耗来评估所提出系统的性能。结果表明功率增益与协作节点数量以及BER和信噪比（Eb/N0）之间存在正比关系。将所提出系统的分析和仿真结果与单输入单输出（SISO）系统进行比较。比较结果表明，在短距离情况下SISO的性能优于协作通信，而在长距离情况下协作通信的性能优于SISO。基于这些结果，可以有把握地得出结论，即使用宽带系统的无线传感器网络中的协作通信可提高网络中节点的寿命，从而延长网络的寿命。
