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Slow wireless communication testbed based on software-defined radio

Wang, Zhiyuan (2017) Slow wireless communication testbed based on software-defined radio.

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Abstract:The Internet of Things (IoT) extends the virtual cyber world into the real physical world by networking everyday smart physical objects, representing an upgraded version of Internet. The wireless sensor networks (WSN) are playing diverse sensing functions and feeding information from the physical world for IoT. Nowadays, most of the WSNs are deployed to detect slow-changing physical quantities and data from sensor nodes in these WSNs vary very slowly over a long time interval. Accordingly, a low data transmission rate is sufficient for the sensor nodes. Moreover, the low data transmission rate also enables very narrowband (VNB) radio communication with a bandwidth of several kHz to be applied in wireless sensor nodes. It is noteworthy that most of wireless sensor nodes are transmitting data in the unlicensed 2.4 GHz frequency band where the dominant interference is characterized by its wideband nature. Therefore, if the very narrowband (VNB) radio is adopted in a wireless sensor node, only a small portion of co-channel wideband interference will overlap with the VNB signal transmitted by the wireless sensor node. Because only a little of the wideband interference is superimposed onto the VNB signal, the VNB signal captured by a receiver has a relatively high signal-to-noise ratio (SNR), making it possible to reduce the power of the transmitter or release the noise of the receiver. Power consumption is a key factor that determines the lifetime of a sensor node because most of sensor nodes are powered by batteries. Once a battery is depleted, the lifetime of a sensor node will expire. The radio transceiver on a wireless sensor node consumes a lot of power when it is working but the VNB signal enables the radio transceiver to decrease its transmission power while guaranteeing arbitrarily low bit error ratio (BER). Thus, low power consumption is made possible at the VNB radio transceiver. In this research project, the VNB radio transceiver applied in a wireless sensor node is called “slow wireless radio”. The slow wireless radio aims at the wireless sensor nodes that are transmitting data at very-low average bit-rate of 100 bits/s in the 2.4 GHz frequency band full of wideband interference while achieving low power consumption. The goal of this project is to build up a point-to-point slow wireless radio communication testbed based on software-defined radio (SDR), where successful VNB wireless communication will be implemented and related communication performances such as signal-to-noise ratio (SNR) and bit error ratio (BER) will be measured in real-time. The testbed will serve as a design reference to investigate the feasibility of the slow-wireless radio communication when it is used in wireless sensor nodes and facilitate the development of a slow-wireless sensor node prototype.
Item Type:Essay (Master)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:53 electrotechnology
Programme:Embedded Systems MSc (60331)
Link to this item:http://purl.utwente.nl/essays/74086
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