Performance Evaluation of an Ultra-Wideband Transmit Diversity in a Living Animal Experiment
Performance Evaluation of an Ultra-Wideband Transmit Diversity in a Living Animal Experiment
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DOI：
10.1109/tmtt.2017.2669039
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发表时间：
2017-03
影响因子：
4.3
通讯作者：
Yuto Shimizu;D. Anzai;R. Chávez-Santiago;P. Floor;I. Balasingham;Jianqing Wang
中科院分区：
文献类型：
--
作者：
Yuto Shimizu;D. Anzai;R. Chávez-Santiago;P. Floor;I. Balasingham;Jianqing Wang
为了实现高数据速率的植入式通信，超宽带(UWB)传输作为一种很有前途的候选技术受到了广泛的关注。然而，由于工作频率较高，UWB通信链路受到很大的衰减。这代表了实现可靠通信的困难。为了缓解这样的问题，文献中提出了空间分集技术，其中一些技术在没有任何频率扩展的情况下工作。相比之下，由于发射机天线尺寸小型化的困难，植入侧分集技术很少被讨论。本文设计了一种超宽带发射机分集天线，并对其性能进行了数值和实验评估。首先，我们在液体体模中进行了有限差分的时域仿真和物理实验，分析了天线的性能。此后，我们使用液体体模和活体猪受试者测量了植入式通信链路中的路径损耗性能。最后，利用所研制的天线评估了植入侧极化分集系统对通信性能的影响。基于测量的极化通道之间的隔离度，我们的测量结果表明，在典型的人体环境下，在预测中断率为0.01、范围为15 cm的情况下，信噪比原则上可以提高7分贝。
To realize implant communications with a high data rate, ultra-wideband (UWB) transmission has gathered a lot of attention as a promising candidate. However, due to high operation frequency, the UWB communication link suffers from large attenuation. This represents the difficulty to achieve reliable communications. To mitigate such a problem, spatial diversity techniques have been proposed in the literature, where some of them work without any frequency extension. In contrast, the implant side diversity technique has been rarely discussed because of the difficulty in miniaturizing the size of the transmitter antenna. In this paper, we designed a UWB transmitter diversity antenna and evaluated its performance numerically and experimentally. First, we analyzed the antenna performance using a finite-difference time-domain simulation and physical experiment in a liquid phantom. Thereafter, we measured the path loss performance in an implant communication link using a liquid phantom and a living porcine subject. Finally, we evaluated the impact of the implant side polarization diversity system with the developed antenna on the communication performance. Based on the measured isolation between the polarization channels, our measurements show that a signal-to-noise power ratio improvement of 7 dB can be in principle achieved with a predicted outage rate of 0.01 and a range of 15 cm in typical body environments.