Unequal channel protection of multiple description codes for wireless broadcast applications
We investigate the problem of optimal channel protection of multiple-description coded (MDC) multimedia contents at a wireless access point (WAP). For each MDC packet, the WAP has the option to protect and broadcast the packet using one of the available channel coders, or to drop the packet altogeth...
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| Published in: | Signal processing. Image communication Vol. 27; no. 6; pp. 625 - 636 |
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| Main Authors: | , , |
| Format: | Journal Article |
| Language: | English |
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Elsevier B.V
01.07.2012
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| ISSN: | 0923-5965, 1879-2677 |
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| Abstract | We investigate the problem of optimal channel protection of multiple-description coded (MDC) multimedia contents at a wireless access point (WAP). For each MDC packet, the WAP has the option to protect and broadcast the packet using one of the available channel coders, or to drop the packet altogether. The goal is to optimize the channel protection strategy at packet level to maximize the expected reconstruction quality at wireless clients (in a rate–distortion sense), subject to the total bandwidth budget available to the WAP. For a fixed FEC-based MDC, we show how this optimization can be approximated by a convex optimization problem with linear constraints, and thus, can be solved efficiently. We verify the validity of our results through extensive simulations of a wireless image streaming system that employs multiple turbo channel coders to wirelessly broadcast images, where we report gains of more than 2.50dB PSNR. Interestingly, while the MDC is balanced, and therefore all packets have equal importance in the reconstruction, the optimal channel protection may require unequal error protection of packets. In other 0words, some packets may have to be protected with stronger channel coders. Next, we consider the case where the design of the MDC itself can also be optimized. We investigate the joint optimization of the channel protection strategy and the design of the MDC through an iterative approach. Our simulations show further gains of up to 3.32dB PSNR using this joint optimization.
► Optimal channel protection of balanced multiple-description coded (balanced MDC) multimedia contents at a WAP. ► Approximation of optimal multi-rate channel protection of balanced MDC packets as convex optimization problem. ► To maximize expected reconstruction quality, fixed FEC-based balanced MDC packets require unequal channel protection. ► More than 2.5dB PSNR gain in a system that employs multiple turbo channel coders to wirelessly broadcast images. ► Iterative joint optimization of the channel protection strategy and MDC design results in further gains up to 3.32db PSNR. |
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| AbstractList | We investigate the problem of optimal channel protection of multiple-description coded (MDC) multimedia contents at a wireless access point (WAP). For each MDC packet, the WAP has the option to protect and broadcast the packet using one of the available channel coders, or to drop the packet altogether. The goal is to optimize the channel protection strategy at packet level to maximize the expected reconstruction quality at wireless clients (in a rate–distortion sense), subject to the total bandwidth budget available to the WAP. For a fixed FEC-based MDC, we show how this optimization can be approximated by a convex optimization problem with linear constraints, and thus, can be solved efficiently. We verify the validity of our results through extensive simulations of a wireless image streaming system that employs multiple turbo channel coders to wirelessly broadcast images, where we report gains of more than 2.50dB PSNR. Interestingly, while the MDC is balanced, and therefore all packets have equal importance in the reconstruction, the optimal channel protection may require unequal error protection of packets. In other 0words, some packets may have to be protected with stronger channel coders. Next, we consider the case where the design of the MDC itself can also be optimized. We investigate the joint optimization of the channel protection strategy and the design of the MDC through an iterative approach. Our simulations show further gains of up to 3.32dB PSNR using this joint optimization.
► Optimal channel protection of balanced multiple-description coded (balanced MDC) multimedia contents at a WAP. ► Approximation of optimal multi-rate channel protection of balanced MDC packets as convex optimization problem. ► To maximize expected reconstruction quality, fixed FEC-based balanced MDC packets require unequal channel protection. ► More than 2.5dB PSNR gain in a system that employs multiple turbo channel coders to wirelessly broadcast images. ► Iterative joint optimization of the channel protection strategy and MDC design results in further gains up to 3.32db PSNR. We investigate the problem of optimal channel protection of multiple-description coded (MDC) multimedia contents at a wireless access point (WAP). For each MDC packet, the WAP has the option to protect and broadcast the packet using one of the available channel coders, or to drop the packet altogether. The goal is to optimize the channel protection strategy at packet level to maximize the expected reconstruction quality at wireless clients (in a rateadistortion sense), subject to the total bandwidth budget available to the WAP. For a fixed FEC-based MDC, we show how this optimization can be approximated by a convex optimization problem with linear constraints, and thus, can be solved efficiently. We verify the validity of our results through extensive simulations of a wireless image streaming system that employs multiple turbo channel coders to wirelessly broadcast images, where we report gains of more than 2.50 dB PSNR. Interestingly, while the MDC is balanced, and therefore all packets have equal importance in the reconstruction, the optimal channel protection may require unequal error protection of packets. In other 0words, some packets may have to be protected with stronger channel coders. Next, we consider the case where the design of the MDC itself can also be optimized. We investigate the joint optimization of the channel protection strategy and the design of the MDC through an iterative approach. Our simulations show further gains of up to 3.32 dB PSNR using this joint optimization. |
| Author | Bais, Abdul Dey, Tanay Sarshar, Nima |
| Author_xml | – sequence: 1 givenname: Abdul surname: Bais fullname: Bais, Abdul email: abdul.bais@uregina.ca, baisabdul@yahoo.com – sequence: 2 givenname: Tanay surname: Dey fullname: Dey, Tanay email: dey204@uregina.ca – sequence: 3 givenname: Nima surname: Sarshar fullname: Sarshar, Nima email: nima.sarshar@uregina.ca |
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| Keywords | Multiple-description coding Wireline and wireless hybrid networks Error correction Convex optimization Quality of service Multimedia broadcasting and streaming |
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| Snippet | We investigate the problem of optimal channel protection of multiple-description coded (MDC) multimedia contents at a wireless access point (WAP). For each MDC... |
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| SubjectTerms | Broadcasting Channels Coders Convex optimization Error correction Multimedia broadcasting and streaming Multiple-description coding Noise levels Optimization Quality of service Reconstruction Strategy Wireline and wireless hybrid networks |
| Title | Unequal channel protection of multiple description codes for wireless broadcast applications |
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