Layered Soft Video Broadcast for Heterogeneous Receivers

Wireless video broadcast poses a challenge to the conventional visual communication in providing simultaneously each receiver the best video quality under its channel condition. Soft video broadcast, as a newly emerged wireless video broadcast scheme, is able to accommodate multiple receivers of dif...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems for video technology 2015-11, Vol.25 (11), p.1801-1814
Main Authors: Fan, Xiaopeng, Xiong, Ruiqin, Zhao, Debin, Wu, Feng
Format: Article
Language:English
Subjects:
Allocations
Bandwidth
Bandwidths
Broadcasting
channel bandwidth
Channels
Conventions
coset coding
Decoding
Discrete cosine transforms
Encoding
Heterogeneity
Noise levels
Optimization
Quantization (signal)
Receivers
Resource management
Soft video broadcast
Wireless communication
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Summary:Wireless video broadcast poses a challenge to the conventional visual communication in providing simultaneously each receiver the best video quality under its channel condition. Soft video broadcast, as a newly emerged wireless video broadcast scheme, is able to accommodate multiple receivers of different channel SNRs. However, the current soft video broadcast frameworks such as SoftCast require the bandwidth of the wireless channel to match the number of video coefficients per second. When the channel bandwidth is larger, the existing frameworks become not very efficient in bandwidth expansion. More importantly, it is possible that the users in broadcast applications have different bandwidths. However, none of the existing soft video broadcast frameworks considers bandwidth heterogeneity. In this paper, we propose a soft video broadcast framework, called LayerCast, which can simultaneously accommodate heterogeneous users with diverse SNRs and diverse bandwidths. The bandwidth expansion problem is solved by applying layered coset coding. More importantly, we derive a globally optimal power allocation between layers and, within each layer, between each DCT chunk. In simulations, the proposed framework outperforms SoftCast of up to 4 dB in video PSNR, and outperforms H.264-based framework up to 8 dB in broadcast.
ISSN:1051-8215
1558-2205
DOI:10.1109/TCSVT.2015.2402831