Application of Adaptive OFDM Bit Loading for High Data Rate Through-Metal Communication
Application of Adaptive OFDM Bit Loading for High Data Rate Through-Metal Communication
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DOI：
10.1109/glocom.2011.6134139
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发表时间：
2011-12
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影响因子：
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通讯作者：
Magdalena Bielinski;Kevin Wanuga;Richard Primerano;M. Kam;K. Dandekar
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文献类型：
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作者：
Magdalena Bielinski;Kevin Wanuga;Richard Primerano;M. Kam;K. Dandekar
金属通声通道具有强多径分量的特点，这是由于通道内声能的回声引起的。因此，传统的单载波系统很难实现高数据速率的传输。本文将一种自适应比特加载技术应用于超声波信号通过金属屏障的数字信号传输。这里讨论的多载波方法使我们能够减轻金属通通信链路的严重频率选择性，并通过利用信道的固定特性提高频谱效率。在超声波金属通道中测试了钻头加载的实验性能。我们的研究结果表明，非功率比例率自适应比特加载明显优于非自适应调制。与窄带调制技术相比，自适应比特加载在严格的误码率约束下，将数据速率从5mbps提高到12mbps，提高了约240%。
The acoustic through-metal channel is characterized by strong multipath components caused by the echoing of acoustic energy within the channel. Transmission at high data rates is therefore difficult to achieve with traditional single-carrier systems. This paper applies an adaptive bit-loading technique to the transmission of digital signals through metal barriers using ultrasonic signaling. The multi-carrier approach discussed here allows us to mitigate severe frequency selectivity of the through-metal communication link and improve spectral efficiency by exploiting the stationary nature of the channel. Experimental performance of bit loading is examined in an ultrasonic through-metal channel. Our results indicate that non-power-scaled rate adaptive bit loading significantly outperforms non-adaptive modulation. Adaptive bit loading was shown to adhere to a strict BER constraint while increasing data rates by roughly 240% from values of 5 Mbps to approximately 12 Mbps when compared to narrowband modulation techniques.