NDLI: A unified coding scheme for hybrid transmission of Gaussian source over Gaussian channel

Content Provider	IEEE Xplore Digital Library
Author	Chao Tian Shamai, S.
Copyright Year	2008
Description	Author affiliation: AT&T Labs.-Res., Florham Park, NJ (Chao Tian)
Abstract	We show that when transmitting a Gaussian source over an average-power-constrained Gaussian channel with mismatched bandwidth, there exists an uncountable set of hybrid digital analog schemes which are optimal under the minimum mean squared error criterion. This generalizes the recent result by Bross et al. that for the bandwidth matched case, there exists an uncountable set of optimal schemes, with the uncoded transmission and the separation approach being the two extremes. The proposed schemes for bandwidth expansion and compression both require proper combination of various components such as power splitting, bandwidth splitting, rate splitting, Wyner-Ziv coding and dirty-paper coding. This set of schemes includes all the existing known optimal schemes as special cases. We show that this set of schemes can be applied to the broadcast scenario with three receivers, when the receiver with median channel SNR achieves optimal distortion, and it offers distortion tradeoff between of the good receiver and bad receiver. Interestingly, though continuous, this tradeoff curve is in fact concave, implying that its performance is worse than a direct time-sharing approach in this three user scenario. We further show even in a more general broadcast setting with a continuum of receivers the time sharing scheme is better than any given scheme in this set; somewhat surprisingly, there exists a unique time-sharing ratio for this to hold.
Starting Page	1548
Ending Page	1552
File Size	240394
Page Count	5
File Format	PDF
ISBN	9781424422562
DOI	10.1109/ISIT.2008.4595247
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-07-06
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Signal to noise ratio Encoding Bandwidth Receivers Channel capacity Distortion Electrical engineering
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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