Two-Hop Two-Path Voice Communications Over a Mobile Ad-Hoc Network

Balam, Jagadeesh; Gibson, J.D.

doi:10.1109/glocom.2007.404

Cited by 1 publication

(3 citation statements)

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“…Also, there are random bit errors due to noise and fading in the physical channel. A two-hop two-path ad-hoc network model in [9], which consists of a path availability model [10] and a physical layer model [11], is used to capture the packet loss features of wireless ad-hoc networks.…”

Section: B Two-hop Two-path Ad-hoc Network Modelmentioning

confidence: 99%

“…The average path unavailability time depends on many factors such as number of nodes in the network, distance between sender and receiver nodes, node velocity, and transmission range. According to [9], we know that the path down time is on the order of seconds, which may cause long burst packet losses. We will see later that MSVC is an effective method to combat burst losses in the network.…”

Section: B Two-hop Two-path Ad-hoc Network Modelmentioning

confidence: 99%

“…Two-hop ad-hoc network, S: Sender, R: Receiver[9] Decode the correctly received MBs in I n and I n+1 , and generate the MB status map Conceal the MBs that are lost at the same spatial position in both frames by weighted pixel interpolation For other lost MBs, copy the MBs from the same position of the other intra frame and calculate the side match distortion Error concealment in intra frame for MSVC…”

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confidence: 99%

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Refined error concealment for multiple state video coding over ad hoc networks

Liao

Gibson

2008

2008 42nd Asilomar Conference on Signals, Systems and Computers

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Providing reliable end-to-end video communications over wireless ad-hoc networks is a challenging problem due to the highly dynamic topology of the ad-hoc networks and the unreliable wireless channels. Multiple description coding (MDC) with path diversity is often proposed to maintain connectivity but the challenge is to match the chosen MDC method with an effective error concealment scheme. The paper proposes refined error concealment (REC) methods on a macroblock (MB) basis for a popular MDC method called multiple state video coding (MSVC) to improve the transmitted video quality over the lossy networks. The performance of the MSVC method with refined error concealment (MSVC REC) is evaluated over a two-hop two-path wireless ad-hoc network model. When compared to MSVC and single description coding (SDC), MSVC REC is shown to provide better PSNR performance over the wireless ad-hoc network with both burst and random losses.

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Section: B Two-hop Two-path Ad-hoc Network Modelmentioning

confidence: 99%

Section: B Two-hop Two-path Ad-hoc Network Modelmentioning

confidence: 99%

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confidence: 99%

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