El Khaled Mohamad, Bahrami Hadi, Fortier Paul, Gosselin Benoit, Rusch Leslie Ann
Annu Int Conf IEEE Eng Med Biol Soc. 2014;2014:3965-8. doi: 10.1109/EMBC.2014.6944492.
Ultra wide-band (UWB) short-range communication systems are valuable in medical technology, particularly for implanted devices, due to their low-power consumption, low cost, small size and high data rates. Monitoring of neural responses in the brain requires high data rate if we target a system supporting a large number of sensors. In this work, we are interested in the evaluation of the capacity of the ultra wide-band (UWB) channel that we could exploit using a realistic model of the biological channel. The channel characteristics are examined under two scenarios that are related to TX antenna placements. Using optimal power spectrum allocation (OPSA) at the transmitter side, we have computed this capacity by taking into account the fading characteristics of the channel. The results show the pertinence of the optimal power spectrum allocation for this type of channel. An improvement by a factor of 2 to 3 over a uniform power spectrum allocation (UPSA) when the SNR <; 0 dB was obtained. When the SNR is > 40 dB, both approaches give similar results. Antennas placement is examined under two scenarios having contrasting power constraints.
超宽带（UWB）短程通信系统在医疗技术中具有重要价值，特别是对于植入式设备，这是由于其低功耗、低成本、小尺寸和高数据速率。如果我们的目标是一个支持大量传感器的系统，那么对大脑中的神经反应进行监测就需要高数据速率。在这项工作中，我们感兴趣的是评估超宽带（UWB）信道的容量，我们可以使用生物信道的实际模型来利用该容量。在与发射天线放置相关的两种场景下检查信道特性。通过在发射机端使用最优功率谱分配（OPSA），我们在考虑信道衰落特性的情况下计算了该容量。结果表明了最优功率谱分配对于此类信道的相关性。当信噪比（SNR）<0 dB时，相对于均匀功率谱分配（UPSA）有2到3倍的提升。当SNR>40 dB时，两种方法给出的结果相似。在具有不同功率约束的两种场景下检查天线放置情况。
