Video quality based link adaptation for low latency video transmission over WLANs

Ferré, P.; Doufexi, Angela; Chung-How, J.; Nix, Andrew R; Bull, David

doi:10.1631/jzus.2006.a0847

Cited by 2 publications

(5 citation statements)

References 19 publications

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“…Such schemes are known as Statistics-based automatic rate control algorithms [7,8,16]. These aim to provide the highest throughput [17,18] since the statistics are directly related to user-level throughput.…”

Section: Existing Link Adaptation Algorithms and Related Workmentioning

confidence: 99%

“…In our previous work [17,36], we have shown that existing algorithms are generally not suitable for low-latency video applications as (i) they do not take into account the nature of the transmitted data, and (ii) they are primarily designed to provide the highest throughput without regard for delay and retransmission. For video transmission where a strong reliance on ARQ is not desirable, a completely error-free communication is not essential when robust video compression techniques are applied.…”

Section: Motivationmentioning

confidence: 99%

“…A switching scheme using PER thresholds was presented by the authors in [17]. Comparisons of this approach with existing throughput-based solutions were made.…”

Section: Motivationmentioning

confidence: 99%

“…The principle is shown in Figure 5 where it can be seen that switching occurs at lower PHY PERs for the video qualitybased algorithm. In [17], it was shown that parameters such as packet size, video rate, and content had a strong influence on the PER thresholds. A rigorous derivation of the PER thresholds was therefore found difficult to establish, and a practical design could not be proposed.…”

Section: Motivationmentioning

confidence: 99%

“…Building on the preliminary work in [17], this paper investigates a rigorous switching scheme based on the received video distortion. The distortion measured here is to the mean square error (MSE) between the received and original pixels.…”

Section: Proposed Approachmentioning

confidence: 99%

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Distortion-Based Link Adaptation for Wireless Video Transmission

Ferré

Chung-How²,

Bull

et al. 2008

EURASIP J. Adv. Signal Process.

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Wireless local area networks (WLANs) such as IEEE 802.11a/g utilise numerous transmission modes, each providing different throughputs and reliability levels. Most link adaptation algorithms proposed in the literature (i) maximise the error-free data throughput, (ii) do not take into account the content of the data stream, and (iii) rely strongly on the use of ARQ. Low-latency applications, such as real-time video transmission, do not permit large numbers of retransmission. In this paper, a novel link adaptation scheme is presented that improves the quality of service (QoS) for video transmission. Rather than maximising the error-free throughput, our scheme minimises the video distortion of the received sequence. With the use of simple and local rate distortion measures and end-to-end distortion models at the video encoder, the proposed scheme estimates the received video distortion at the current transmission rate, as well as on the adjacent lower and higher rates. This allows the system to select the link-speed which offers the lowest distortion and to adapt to the channel conditions. Simulation results are presented using the MPEG-4/AVC H.264 video compression standard over IEEE 802.11g. The results show that the proposed system closely follows the optimum theoretic solution.

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Section: Existing Link Adaptation Algorithms and Related Workmentioning

confidence: 99%

Section: Motivationmentioning

confidence: 99%

“…A switching scheme using PER thresholds was presented by the authors in [17]. Comparisons of this approach with existing throughput-based solutions were made.…”

Section: Motivationmentioning

confidence: 99%

Section: Motivationmentioning

confidence: 99%

Section: Proposed Approachmentioning

confidence: 99%

See 3 more Smart Citations