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Video Transmission for Third Generation Wireless Communication Systems

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ABSTRACT

This paper presents a twin-class unequal protected video transmission system over wireless channels. Video partitioning based on a separation of the Variable Length Coded (VLC) Discrete Cosine Transform (DCT) coefficients within each block is considered for constant bitrate transmission (CBR). In the splitting process the fraction of bits assigned to each of the two partitions is adjusted according to the requirements of the unequal error protection scheme employed. Subsequently, partitioning is applied to the ITU-T H.263 coding standard. As a transport vehicle, we have considered one of the leading third generation cellular radio standards known as WCDMA. A dual-priority transmission system is then invoked on the WCDMA system where the video data, after being broken into two streams, is unequally protected. We use a very simple error correction coding scheme for illustration and then propose more sophisticated forms of unequal protection of the digitized video signals. We show that this strategy results in a significantly higher quality of the reconstructed video data when it is transmitted over time-varying multipath fading channels.

No MeSH data available.


Two-layer partitioning for selection value of 2.
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f8-j62gar: Two-layer partitioning for selection value of 2.

Mentions: Next, we discuss the manner in which the two partitions are formed. For this purpose, let’s consider a scenario where the cut-off value indicates that at least two VLCs should be selected for the upcoming GOB. In this case, as shown in Fig. 8, the first partition begins with the GOB header followed by the MB header and the first two VLCs from each block in the transmitting order. This process will continue until the selection value is updated at the next GOB. The remaining VLCs are subsequently transferred to the second partition in the same order. It should be noted that the second bitstream does not carry any VLCs from the blocks whose last VLCs are included in the first partition or identified as zero blocks by the macroblock header (i.e., B2, B5, B6 in Fig. 8).


Video Transmission for Third Generation Wireless Communication Systems
Two-layer partitioning for selection value of 2.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4862809&req=5

f8-j62gar: Two-layer partitioning for selection value of 2.
Mentions: Next, we discuss the manner in which the two partitions are formed. For this purpose, let’s consider a scenario where the cut-off value indicates that at least two VLCs should be selected for the upcoming GOB. In this case, as shown in Fig. 8, the first partition begins with the GOB header followed by the MB header and the first two VLCs from each block in the transmitting order. This process will continue until the selection value is updated at the next GOB. The remaining VLCs are subsequently transferred to the second partition in the same order. It should be noted that the second bitstream does not carry any VLCs from the blocks whose last VLCs are included in the first partition or identified as zero blocks by the macroblock header (i.e., B2, B5, B6 in Fig. 8).

View Article: PubMed Central - PubMed

ABSTRACT

This paper presents a twin-class unequal protected video transmission system over wireless channels. Video partitioning based on a separation of the Variable Length Coded (VLC) Discrete Cosine Transform (DCT) coefficients within each block is considered for constant bitrate transmission (CBR). In the splitting process the fraction of bits assigned to each of the two partitions is adjusted according to the requirements of the unequal error protection scheme employed. Subsequently, partitioning is applied to the ITU-T H.263 coding standard. As a transport vehicle, we have considered one of the leading third generation cellular radio standards known as WCDMA. A dual-priority transmission system is then invoked on the WCDMA system where the video data, after being broken into two streams, is unequally protected. We use a very simple error correction coding scheme for illustration and then propose more sophisticated forms of unequal protection of the digitized video signals. We show that this strategy results in a significantly higher quality of the reconstructed video data when it is transmitted over time-varying multipath fading channels.

No MeSH data available.