NDLI: Limited-feedback-based channel-aware power allocation for linear distributed estimation

Content Provider	IEEE Xplore Digital Library
Author	Fanaei, M. Valenti, M.C. Schmid, N.A.
Copyright Year	2013
Description	Author affiliation: Lane Dept. of Comput. Sci. & Electr. Eng., West Virginia Univ., Morgantown, WV, USA (Fanaei, M.; Valenti, M.C.; Schmid, N.A.)
Abstract	This paper investigates the problem of distributed best linear unbiased estimation (BLUE) of a random parameter at the fusion center (FC) of a wireless sensor network (WSN). In particular, the application of limited-feedback strategies for the optimal power allocation in distributed estimation is studied. In order to find the BLUE estimator of the unknown parameter, the FC combines spatially distributed, linearly processed, noisy observations of local sensors received through orthogonal channels corrupted by fading and additive Gaussian noise. Most optimal power-allocation schemes proposed in the literature require the feedback of the exact instantaneous channel state information from the FC to local sensors. This paper proposes a limited-feedback strategy in which the FC designs an optimal codebook containing the optimal power-allocation vectors, in an iterative offline process, based on the generalized Lloyd algorithm with modified distortion functions. Upon observing a realization of the channel vector, the FC finds the closest codeword to its corresponding optimal power-allocation vector and broadcasts the index of the codeword. Each sensor will then transmit its analog observations using its optimal quantized amplification gain. This approach eliminates the requirement for infinite-rate digital feedback links and is scalable, especially in large WSNs.
Sponsorship	IEEE Signal Process. Soc.
Starting Page	547
Ending Page	551
File Size	218989
Page Count	5
File Format	PDF
e-ISBN	9781479923908
DOI	10.1109/ACSSC.2013.6810338
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-11-03
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Sensors Vectors Fading Estimation Wireless sensor networks Channel estimation Algorithm design and analysis wireless sensor networks Limited feedback best linear unbiased estimator (BLUE) generalized Lloyd algorithm power allocation distributed estimation fusion center
Content Type	Text
Resource Type	Article

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