Abstract
We consider joint source-channel coding with bandwidth expansion, in a quadratic-Gaussian setting. We seek a scheme that will have favorable delay and robustness characteristics: it should be scalar (working on a single source sample), and closely follow the optimal curve of signal-to-distortion ratio (SDR) versus signal-to-noise ratio (SNR), asymptotically as the SNR grows. A natural candidate is bit interleaving, which was already proposed by Shannon in the context of bandwidth compression; however, in the case of expansion it suffers from severe noise amplification. A scheme proposed by Teherzadeh and Khandani introduces fixed bits in order to combat noise amplification, and has a multiplicative gap that is exponential the square root of the SNR from the ideal SDR-SNR curve. We propose an improved scheme that allocates the fixed bits in a source-dependent manner. This approach reduces the number of fixed bits needed, and thus has lower redundancy; we show that the multiplicative gap from the ideal curve is only linear in the SNR.
Original language | English |
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Title of host publication | 54th Annual Allerton Conference on Communication, Control, and Computing, Allerton 2016 |
Publisher | Institute of Electrical and Electronics Engineers Inc. |
Pages | 969-973 |
Number of pages | 5 |
ISBN (Electronic) | 9781509045495 |
DOIs | |
State | Published - 10 Feb 2017 |
Event | 54th Annual Allerton Conference on Communication, Control, and Computing, Allerton 2016 - Monticello, United States Duration: 27 Sep 2016 → 30 Sep 2016 |
Publication series
Name | 54th Annual Allerton Conference on Communication, Control, and Computing, Allerton 2016 |
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Conference
Conference | 54th Annual Allerton Conference on Communication, Control, and Computing, Allerton 2016 |
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Country/Territory | United States |
City | Monticello |
Period | 27/09/16 → 30/09/16 |
Bibliographical note
Publisher Copyright:© 2016 IEEE.