Multiple Description Coding and Path Diversity for Voice Communication over MANETs

Balam, Jagadeesh; Gibson, J.D.

doi:10.1109/acssc.2005.1599757

Cited by 3 publications

(4 citation statements)

References 3 publications

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“…one copy one channel). d) A MD codec based on G.729 with path diversity (MD-PD) presented in [7], its bit allocation scheme is similar to our MD-G.729 in each frame, but its two balanced descriptions are created only by splitting G.729 bitstream without using interleaving.…”

Section: Experiments and Resultsmentioning

confidence: 99%

“…Although its MD codec streams can be achieved without increasing any bandwidth, it has worse speech quality than the standard codec even all descriptions are received, because a large subframe size means an average parameter estimation and may lead to losing rapid time-varying information of speech. Another kind proposed recently in [6] and [7] is to produce two descriptions only by splitting the standard coded bitstream into two redundant sub-streams. With the usage of path diversity, the output raw data of their MD codecs can provide better speech quality than conventional single description (SD) codecs at a cost of small increase in bit rate.…”

Section: Introductionmentioning

confidence: 99%

“…To tackle the high bandwidth requirement in [6] and [7], we propose a new interleaving scheme for MDC. Unlike the bitstream splitting schemes, two descriptions are created from the interleaved subframes distributed in two adjacent frames.…”

Section: Introductionmentioning

confidence: 99%

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Distributed subframe interleaving: A new solution for packet loss resilient speech coding

Lu³

2008

2008 Third International Conference on Communications and Networking in China

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Packets carrying real-time speech data may be lost during transmission over unreliable networks. This loss can lead to considerable degradation of speech quality. In this paper, we propose a new distributed subframe interleaving scheme for multiple description speech coding to avoid repeat transmission and ensure acceptable speech quality when packet loss occurs. With introducing distributed subframe interleaving operated on two adjacent speech frames, the proposed scheme creates two correlative descriptions, each offers an acceptable quality and can be partially restored from the other. The performance of the proposed scheme is evaluated by the objective speech quality measurement PESQ. Experimental results demonstrate that it is suitable to unreliable and bandwidth constraint packet networks.

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Section: Experiments and Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Distributed subframe interleaving: A new solution for packet loss resilient speech coding

Lu³

2008

2008 Third International Conference on Communications and Networking in China

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“…Then we present experimental results for a similar scenario using MD speech coders. We developed two new MD speech coders -one [6] based on the AMR-WB codec [7], [8] and the other [9] based on G.729 [10]. These coders create two descriptions of equal rate from the bit-stream of a standard single description (SD) coder.…”

Section: Introductionmentioning

confidence: 99%

Multiple Descriptions and Path Diversity for Voice Communications Over Wireless Mesh Networks

Balam

Gibson

2007

IEEE Trans. Multimedia

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A key feature of wireless mesh networks is that multiple independent paths through the network are available.Multiple descriptions coding is often suggested as a source coding scheme to take advantage of this path diversity.We compare multiple description (MD) coding with path diversity (PD) against a full-rate single description (SD) coder without PD, and two simple PD methods of 1) repeating a half-rate SD coder over both paths and 2) repeating the full-rate parent SD coder over the two paths. We first present a theoretical analysis comparing the average distortion per symbol in packetized communication using the above mentioned MD and PD methods to transmit a memoryless Gaussian source over additive white Gaussian noise channels. Next, using two new MD speech coders with balanced side descriptions derived from the AMR-WB and G.729 standards, we evaluate delivered voice quality using PESQ-MOS and compare MD coding against the PD methods for random and bursty packet losses. Both the theoretical analyses and the speech coding experiments show that with packet overheads, the simple PD methods may be preferable to MD coding. A new performance measure that incorporates both quality and bit-rate is shown to account for the tradeoffs more explicitly.

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Space-Based Voice over IP Networks

Nguyen

Okino

Clare

et al. 2007

2007 IEEE Aerospace Conference

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In human space exploration missions, there will be a need to provide voice communications services. In this work we focus on the performance of Voice over IP (VoIP) techniques applied to space networks, where long range latencies, simplex links, and significant bit error rates occur. Link layer and network layer overhead issues are examined. We posit that imposing additional speech processing latencies in the form of multiple frames per packet is tolerable in the space regime, and show resulting performance overhead improvements. Furthermore, we find that even with channel bit error rates of 10 -5 and 10 -4 , the frame size does not severely degrade the original speech. 1,2

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Multiple Description Coding and Path Diversity for Voice Communication over MANETs

Cited by 3 publications

References 3 publications

Distributed subframe interleaving: A new solution for packet loss resilient speech coding

Distributed subframe interleaving: A new solution for packet loss resilient speech coding

Multiple Descriptions and Path Diversity for Voice Communications Over Wireless Mesh Networks

Space-Based Voice over IP Networks

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