DocumentCode :
3036283
Title :
Coding and Enhancement in Wireless Acoustic Sensor Networks
Author :
Zahedi, Adel ; Ostergaard, Jan ; Jensen, Soren Holdt ; Naylor, Patrick ; Bech, Soren
Author_Institution :
Dept. of Electron. Syst., Aalborg Univ., Aalborg, Denmark
fYear :
2015
fDate :
7-9 April 2015
Firstpage :
293
Lastpage :
302
Abstract :
We formulate a new problem which bridges between source coding and enhancement in wireless acoustic sensor networks. We consider a network of wireless microphones, each of which encoding its own measurement under a covariance matrix distortion constraint and sending it to a fusion center. To process the data at the center, we use a recent spatio-temporal prediction filter. We assume that a weighted sum-rate for the network is specified. The problem is to allocate optimal distortion matrices to the nodes in order to achieve a maximum output SNR at the fusion center after processing the received data, while the weighted sum-rate for the network is no more than the specified value. We formulate this problem as an optimization problem for which we derive a set of equalities imposed on the solution by studying the KKT conditions. In particular, for the special case of scalar sources with two microphones and a sum-rate constraint, we derive the distortion allocation in closed form and will show that if the given sum-rate is higher than a critical value, the stationary points from the KKT conditions lead to distortion allocations which maximize the output SNR of the filter.
Keywords :
acoustic communication (telecommunication); covariance matrices; microphones; network coding; optimisation; sensor fusion; spatial filters; wireless sensor networks; KKT conditions; covariance matrix distortion constraint; distortion allocation; fusion center; optimal distortion matrix allocation; optimization problem; source coding; source enhancement; spatio-temporal prediction filter; sum-rate constraint; wireless acoustic sensor network; wireless microphone; Acoustic distortion; Covariance matrices; Microphones; Signal to noise ratio; Wireless communication; Wireless sensor networks;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Data Compression Conference (DCC), 2015
Conference_Location :
Snowbird, UT
ISSN :
1068-0314
Type :
conf
DOI :
10.1109/DCC.2015.20
Filename :
7149286
Link To Document :
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