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      Interference mitigation and awareness for improved reliability

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      Author(s)
      Arslan, H.
      Yarkan S.
      Şahin, M. E.
      Gezici, Sinan
      Date
      2011
      Publisher
      Cambridge University Press
      Pages
      190 - 233
      Language
      English
      Type
      Book Chapter
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      Book Title
      Reliable communications for short-range wireless systems
      Abstract
      Wireless systems are commonly affected by interference from various sources. For example, a number of users that operate in the same wireless network can result in multiple-access interference (MAI). In addition, for ultrawideband (UWB) systems, which operate at very low power spectral densities, strong narrowband interference (NBI) can have significant effects on the communications reliability. Therefore, interference mitigation and awareness are crucial in order to realize reliable communications systems. In this chapter, pulse-based UWB systems are considered, and the mitigation of MAI is investigated first. Then, NBI avoidance and cancelation are studied for UWB systems. Finally, interference awareness is discussed for short-rate communications, next-generation wireless networks, and cognitive radios.Mitigation of multiple-access interference (MAI)In an impulse radio ultrawideband (IR-UWB) communications system, pulses with very short durations, commonly less than one nanosecond, are transmitted with a low-duty cycle, and information is carried by the positions or the polarities of pulses [1-5]. Each pulse resides in an interval called frame, and the positions of pulses within frames are determined according to time-hopping (TH) sequences specific to each user. The low-duty cycle structure together with TH sequences provide a multiple-access capability for IR-UWB systems [6].Although IR-UWB systems can theoretically accommodate a large number of users in a multiple-access environment [2, 4], advanced signal processing techniques are necessary in practice in order to mitigate the effects of interfering users on the detection of information symbols efficiently [6]. © Cambridge University Press 2011.
      Keywords
      Broadband networks
      Cognitive radio
      Interference suppression
      Power spectral density
      Signal processing
      Spectral density
      Ultra-wideband (UWB)
      Wireless networks
      Advanced signal processing
      Communications systems
      Impulse radio ultra wideband (IR-UWB)
      Interference mitigation
      Narrow band interference
      Next-generation wireless network
      Reliable communication
      Time hopping sequences
      Multiple access interference
      Permalink
      http://hdl.handle.net/11693/37792
      Published Version (Please cite this version)
      https://doi.org/10.1017/CBO9780511974366.008
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      • Department of Electrical and Electronics Engineering 3863
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