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arXiv 0912.0765cs.ITmath.IT
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无线传感器网络中LT码的能量有效性研究

On the Energy Efficiency of LT Codes in Proactive Wireless Sensor Networks

Jamshid Abouei, J. David Brown, Konstantinos N. Plataniotis, Subbarayan Pasupathy

摘要:

本文首次深入分析了在具有路径损耗的瑞利平坦衰落信道下,在主动无线传感器网络(WSN)中采用非相干M进制频移键控(NC-MFSK)(称为绿色调制[1])的LT码的能量效率。我们描述的主动系统模型,根据一个预先确定的基于时间的过程中使用的实际传感器节点。目前的分析是基于现实的参数,包括在IEEE 802.15.4标准中使用的信道带宽的效果,和活动模式持续时间。通过对LT码速率和编码增益的概率质量函数的仿真研究,综合分析表明,在未编码的NC-MFSK和各种经典信道编码方案中,优化的LT编码的NC-MFSK是最节能的方案,距离$d$大于预定阈值水平$d_T$,其中优化是在编码和调制参数上执行的。另外,尽管未编码的NC-MFSK优于$d < d_T$的编码方案,但是与其它编码方案相比,对于$d < d_T$,LT编码的和未编码的NC-MFSK之间的能量间隙是可忽略的。这些结果来自LT码的灵活性,以调整其速率,以适应瞬时信道条件,并建议LT码是有益的,在实际的低功耗无线传感器网络与动态位置传感器节点。

英文摘要:

This paper presents the first in-depth analysis on the energy efficiency of LT codes with Non Coherent M-ary Frequency Shift Keying (NC-MFSK), known as green modulation [1], in a proactive Wireless Sensor Network (WSN) over Rayleigh flat-fading channels with path-loss. We describe the proactive system model according to a pre-determined time-based process utilized in practical sensor nodes. The present analysis is based on realistic parameters including the effect of channel bandwidth used in the IEEE 802.15.4 standard, and the active mode duration. A comprehensive analysis, supported by some simulation studies on the probability mass function of the LT code rate and coding gain, shows that among uncoded NC-MFSK and various classical channel coding schemes, the optimized LT coded NC-MFSK is the most energy-efficient scheme for distance $d$ greater than the pre-determined threshold level $d_T$, where the optimization is performed over coding and modulation parameters. In addition, although uncoded NC-MFSK outperforms coded schemes for $d < d_T$, the energy gap between LT coded and uncoded NC-MFSK is negligible for $d < d_T$ compared to the other coded schemes. These results come from the flexibility of the LT code to adjust its rate to suit instantaneous channel conditions, and suggest that LT codes are beneficial in practical low-power WSNs with dynamic position sensor nodes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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