Approaches to layered coding for dual-rate wireless video transmission

We study and compare three coded schemes for single-server wireless broadcast of multiple description coded content to heterogeneous users. The users (sink nodes) demand different number of descriptions over links with different packet loss rates. The three coded schemes are based on the LT codes, growth codes, and randomized chunked codes. The schemes are compared on the basis of the total number of transmissions required to deliver the demands of all users, which we refer to as the server (source) delivery time. We design the degree distributions of LT codes by solving suitably defined linear optimization problems, and numerically characterize the achievable delivery time for different coding schemes. We find that including a systematic phase (uncoded transmission) is significantly beneficial for scenarios with low demands, and that coding is necessary for efficiently delivering high demands. Different demand and error rate scenarios may require very different coding schemes. Growth codes and chunked codes do not perform as well as optimized LT codes in the heterogeneous communication scenario.

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“…[15,Thm. 2]) If an LT code of N content packets has degree distribution specified by the moment generating function P (N ) (x) (see (1)), then…”

Section: Definition 2 (Recoverable Fraction)mentioning

confidence: 99%

Three schemes for wireless coded broadcast to heterogeneous users

Soljanin²,

Spasojević

2013

Physical Communication

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“…Layered representations for Internet streaming have been widely studied, e.g., in [5,13,14]. In addition, scalable representations have become part of established video coding standards, such as MPEG and H.263+ [15,16].…”

Section: Related Workmentioning

confidence: 99%

Adaptive Layered Multimedia Transmissions over Wireless Networks

Durresi

Paruchuri

Durrësi

et al. 2008

2008 the 28th International Conference on Distributed Computing Systems Workshops

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Layered transmission is a promising solution to multimedia transmission over Wireless Networks.However, since the number of layers is practically limited, noticeable mismatches would occur between the coarse-grained layer subscription levels and the heterogeneous and dynamic rate requirements from the receivers.In this paper, we propose Adaptive Layered Multicast (ALM) that exploits the increasing computing and communications capabilities of wireless devices. We show that by having few multicast nodes (about 10% the number of receivers) to encode and decode the video, an improvement of more than 30% in bandwidth efficiency could be achieved.

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“…ij j + j j ? ij j (1) The decision rules for di erent cases are described in the following. Case 1: zero transition case.…”

Section: Isolated Lost Blocksmentioning

confidence: 99%

“…The inter-block correlation, however, is only partially exploited because only the DC component is di erentially coded. The AC components are encoded separately, independent of other blocks 1 . This turns out to be ine cient in low bite rate coding.…”

Section: Introductionmentioning

confidence: 99%

Geometric-structure-based error concealment with novel applications in block-based low-bit-rate coding

Zeng

Liu²

1999

IEEE Trans. Circuits Syst. Video Technol.

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This paper rst proposes a computationally e cient spatial directional interpolation scheme which makes use of the local geometric information extracted from the surrounding blocks. The proposed error concealment scheme produces results that are superior to those of other approaches, in terms of both peak signal-to-noise ratio and visual quality. Then a novel approach which incorporates this directional spatial interpolation at the receiver is proposed for block-based low bit rate coding. The key observation is that the directional spatial interpolation at the receiver can reconstruct faithfully a large percentage of the blocks that are intentionally not sent. Rate-distortion optimal way to drop the blocks is shown. The new approach can be made compatible with standard JPEG and MPEG decoders. The block-dropping approach also has an important application for dynamic rate shaping in transmitting precompressed videos over channels of dynamic bandwidth. Experimental results show that the proposed coding and rate shaping systems can provide signi cant subjective and objective gains over conventional approaches.

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Approaches to layered coding for dual-rate wireless video transmission

Cited by 22 publications

References 6 publications

Three schemes for wireless coded broadcast to heterogeneous users

Three schemes for wireless coded broadcast to heterogeneous users

Adaptive Layered Multimedia Transmissions over Wireless Networks

Geometric-structure-based error concealment with novel applications in block-based low-bit-rate coding

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