KEYWORDS: Forward error correction, Video, Systems modeling, Video coding, Yield improvement, Telecommunications, Performance modeling, Local area networks, Antennas, Image transmission
This paper demonstrates the effectiveness of employing MDC (multiple-description coding) as a video decomposition for
transmission in the presence of error bursts, with application to both SISO and MIMO-STBC (space-time block coding)
systems envisaged. Various trade-offs involving video encoding parameters are investigated that offer improved
performance and reduce the decoding delay for the given channel conditions, based on the Gilbert-Elliot channel model.
This results in a joint source-channel coding approach that significantly enhances the quality of the transmitted video.
While interleaving without the use of MDC does yield improvements in average PSNR of up to 1dB, these may not be
justified given the high decoding delay incurred. The use of MDC increases these improvements to over 2dB, and also
outperforms SDC coupled with cross-packet FEC. In addition, when FEC is combined with MDC, a gain of up to 2dB is
obtained compared to the equivalent SDC+FEC scheme (for average PERs above 5%), and up to 5dB compared to the
values obtained from simple SDC interleaving.
Unlike simple interleaving, the use of MDC and FEC entails some increased complexity and a decrease in error-free
quality. Simple interleaving, however, cannot achieve the gains available from MDC/FEC in the presence of error bursts,
irrespective of the interleaving depth employed and the resulting decoding delay.
MIMO (multiple-input-multiple-output) systems offer potential for throughput increase and enhanced quality of service
for multimedia transmission. The underlying multipath environment requires new error-resilience techniques if the
obtained benefits are to be fully exploited. Different MIMO architectures produce error-patterns of somewhat diverse
characteristics. This paper proposes the use of multiple-description coding (MDC) as an approach that outperforms the
standard-based error-resilience techniques in the majority of these cases. Results obtained from the random packet-error
generator are furthered through the use of realistic MIMO channel scenarios and argue in favour of the deployment of an
MDC-based video transmission system. Singular value decomposition (SVD) is used to create orthogonal sub-channels
within a MIMO system which provide, depending on their respective gains and fading characteristics, an efficient means
of mapping video content. Results indicate improvements in average PSNR of decoded test-sequences of up to 3 dB
(5dB in the region of high PERs) compared to standard, single-description video transmission. This is also supported by
significant subjective quality enhancements.
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