Paper Info
Title
Hybrid Digital-Analog transmission for wireless acoustic sensor networks.
Abstract
A crucial task of a Wireless Acoustic Sensor Network (WASN) is the transmission of the acoustic signal to a central fusion node. Due to different microphone locations, the microphones may experience different or even varying radio channel qualities. Usually, the design of the digital transmission scheme is governed by the worst-case radio channel. For given radio resources, the end-to-end audio quality is specified by the compromise between the fidelity of the audio encoder and the required error protection capabilities of the channel encoder. The quantization noise of the audio encoder limits the end-to-end SNR even for increasing radio channel qualities. In the fusion node, the decoded signals are combined (fusion algorithm) and the overall output audio quality is limited due to the quantization noise even for error free transmission. In this paper it is shown that this unfavorable behavior can be avoided by using a Hybrid Digital-Analog (HDA) transmission concept. The key feature of HDA is that the audio output quality improves with increasing channel qualities. For typical fusion algorithms the HDA system supersedes purely digital transmission for all radio channel qualities.
Year
DOI
Venue
2015
10.1016/j.sigpro.2014.07.005
Signal Processing
Keywords
Field
DocType
Hybrid Digital–Analog (HDA),Purely digital transmission,Saturation due to quantization noise,Maximum Ratio Combining (MRC)
Wireless,Data transmission,Communication channel,Sound quality,Electronic engineering,Audio signal flow,Encoder,Audio signal processing,Quantization (signal processing),Electrical engineering,Mathematics
Journal
Volume
Issue
ISSN
107
C
0165-1684
Citations 
PageRank 
References 
1
0.34
2
Authors
2
Name
Order
Citations
PageRank
Matthias Rüngeler182.61
Peter Vary285275.52