TR2006-117

UWB-based Sensor Networks and the IEEE 802.15.4a Standard - A Tutorial


    •  Molisch, A.F.; Orlik, P.; Sahinoglu, Z.; Zhang, J., "UWB-based Sensor Networks and the IEEE 802.15.4a Standard - A Tutorial", International Conference on Communications and Networking in China (CHINACOM), October 2006, pp. 1-6.
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      • @inproceedings{Molisch2006oct1,
      • author = {Molisch, A.F. and Orlik, P. and Sahinoglu, Z. and Zhang, J.},
      • title = {UWB-based Sensor Networks and the IEEE 802.15.4a Standard - A Tutorial},
      • booktitle = {International Conference on Communications and Networking in China (CHINACOM)},
      • year = 2006,
      • pages = {1--6},
      • month = oct,
      • url = {http://www.merl.com/publications/TR2006-117}
      • }
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  • Research Area:

    Communications


This paper gives a tutorial overview of ultrawideband communications systems for sensor networks. In particular, we describe the IEEE 802.15.4a standards, which is currently being developed. While most nodes (reduced-function devices) in sensor networks usually have to consume little energy, and are constrained with respect to the complexity of the processing they can perform, some nodes (full-function devices) do not show these restrictions. We describe a hybrid modulation, coding, and multiple access scheme that is particulary suited for heterogeneous networks that contain both FFDs and RFDs. The scheme is a generalization of the well-known time-hopping impulse radio (TH-IR). It employs systematic coding, joint pulse-position modulation and phase shift keying, as well as a combination of polarity scrambling and time-hopping. We also describe two-way ranging algorithms that serve as the basis for geolocation in 802.15.4a, and we discuss the methods for how the ranging information can be kept secret from snoopers.