Robust low bit-rate video transmission over wireless access systems

Khansari, M.; Jalah, A.; Dubois, Éric; Mermelstein, P.

doi:10.1109/icc.1994.368840

Cited by 25 publications

(10 citation statements)

References 7 publications

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“…For example, wireless links normally require link-layer error recovery (such as 802.2 LLC) and MAC-level error recovery in subnetwork. There are two basic categories of error recovery schemes: ARQ (Automatic Repeat reQuest) [19,[21][22][27][28] and FEC (Forward Error Correction) [20,40]. Which are described in the following subsection.…”

Section: Error Control Based Enhancement Schemesmentioning

confidence: 99%

“…While it is waiting, the sender is unable to send another packet. In fact, the current MAC mechanism of IEEE 802.11 WLAN uses this error control mechanism because it is more efficient and simpler than FEC [28,1]. [21] Unlike SW-ARQ, when using SR-ARQ, packets are transmitted continuously by the Data Link Control (DLC) layer.…”

Section: Automatic Repeat Request (Arq)mentioning

confidence: 99%

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A survey of QoS enhancements for IEEE 802.11 wireless LAN

Romdhani

Turletti

2004

Wireless Communications

234

158

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SummaryQuality of service (QoS) is a key problem of today's IP networks. Many frameworks (IntServ, DiffServ, MPLS, etc.) have been proposed to provide service differentiation in the Internet. At the same time, the Internet is becoming more and more heterogeneous due to the recent explosion of wireless networks. In wireless environments, bandwidth is scarce and channel conditions are time-varying and sometimes highly lossy. Many previous research works show that what works well in a wired network cannot be directly applied in the wireless environment. Although IEEE 802.11 wireless LAN (WLAN) is the most widely used WLAN standard today, it cannot provide QoS support for the increasing number of multimedia applications. Thus, a large number of 802.11 QoS enhancement schemes have been proposed, each one focusing on a particular mode. This paper summarizes all these schemes and presents a survey of current research activities. First, we analyze the QoS limitations of IEEE 802.11 wireless MAC layers. Then, different QoS enhancement techniques proposed for 802.11 WLAN are described and classified along with their advantages/drawbacks. Finally, the upcoming IEEE 802.11e QoS enhancement standard is introduced and studied in detail.

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Section: Error Control Based Enhancement Schemesmentioning

confidence: 99%

Section: Automatic Repeat Request (Arq)mentioning

confidence: 99%

A survey of QoS enhancements for IEEE 802.11 wireless LAN

Romdhani

Turletti

2004

Wireless Communications

234

158

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“…A plethora of video codecs have been proposed in the excellent special issues edited by Tzou et al [157], Hubing [158], and Girod et al [159] for a range of bit rates and applications, but the individual contributions by a number of renowned authors are too numerous to review. Khansari et al [166] as well as Pelz [180] reported promising results on adopting the H.261 codec for wireless applications by invoking powerful signal-processing and error-control techniques in order to remedy the inherent source-coding problems due to stretching its application domain to hostile wireless environments. Färber et al [167]- [170] also contributed substantially toward advancing the state of the art in the context of the H.263 codec as well as in motion compensation [168], [169], as did Eryurtlu, Sadka, and Kondoz [174]- [175].…”

Section: A Motivation and Backgroundmentioning

confidence: 99%

Bandwidth-efficient wireless multimedia communications

Hanzo

1998

Proc. IEEE

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“…Although the MPEG4 working group's activities also target mobile videophony [169] and work is under way toward defining a so-called mobile extension to the H.263 codec, to date, there are no approved video coding standards for mobile videophony over existing or future standard radio systems. Khansari et al [130] as well as Pelz [163] reported promising results on adopting the H.261 codec for wireless applications by invoking powerful signal-processing and error-control techniques in order to mitigate the error sensitivity problems due to stretching the application domain of these vulnerable run-length compressed schemes to hostile wireless environments.…”

Section: A Advances In Low-rate Video Compressionmentioning

confidence: 99%

“…Again, the H.263 codec was detailed in [27], [53], and [175], while a number of transmission schemes designed for accommodating its rather error-sensitive bit stream were proposed, e.g., by the prestigious video communications groups led by Girod at Stanford University, Kondoz at Surrey University, Bull at Bristol University, and others, e.g., in [130]- [147]. As an illustrative example, in Table 5, we summarized the various video resolutions supported by the H.261 and H.263 ITU codecs in order to demonstrate their flexibility [27].…”

Section: B Video Sequencesmentioning

confidence: 99%

Interactive cellular and cordless video telephony: State-of-the-art system design principles and expected performance

2000

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Second-generation (2G) mobile radio standards have not been designed with video communications in mind, although the employment of error-resilient, constant-bit-rate proprietary video codecs over these systems is realistic. The third-generation (3G) systems I. STATE-OF-THE-ART SYSTEM COMPONENT DEVELOPMENTS A. Introduction and OutlineThe subject of mobile radio communications has reached a state of maturity over the past two decades, as indicated by the excellent monographs by Jakes This contribution attempts to summarize a range of recent advances in the field of bandwidth-efficient wireless video communications. In this section, we commence our discourse with a brief overview of the wireless scene and, in particular, by considering the video transmission capabilities of the existing and future wireless systems. The geographical variation of the cellular channel capacity is characterized by Section II, as a motivation for invoking burst-by-burst adaptive transceivers [27]- [29]. The nature of co-channel interference (CCI)-which is the most dominant channel impairment in wireless systems-is the topic of Section III, where it is shown that the geographic variation of CCI justifies the employment of multimode transceivers, which are discussed in Section IV. Low-rate video compression aspects are reviewed in Section V, and the performance of the ITU H.263 codec is analyzed in some depth. Our discussions in Sections VI and VII are focused on the performance of reconfigurable video transceivers. Specifically, in Section VI, no power control is used-which is typically the case in cordless telephones, such as DECT and CT2-while in Section VII, power control is employed, which is characteristic of cellular systems, such as GSM [30], etc. Section VIII proposes a near-instantaneously adaptive or burst-by-burst adaptive code-division multiple-access (CDMA) scheme, which can be invoked in the context of the forthcoming 3G systems, in order to enhance their performance. Lastly, our discussions are concluded in Section IX with a range of system design guidelines. Let us now commence our overview of the range of existing and forthcoming wireless systems and their video transmission capabilities. B. Second-Generation (2G) Wireless SystemsThe existing 2G wireless systems now constitute a mature technology. Although they have not been designed with video communications in mind, with the advent of the specially designed error-resilient, fixed-rate video codecs [27]-[35] proposed by Streit et al., it is nonetheless realistic to provide videophone services over these low-rate schemes. For low-latency interactive videophony these systems have

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Robust low bit-rate video transmission over wireless access systems

Cited by 25 publications

References 7 publications

A survey of QoS enhancements for IEEE 802.11 wireless LAN

A survey of QoS enhancements for IEEE 802.11 wireless LAN

Bandwidth-efficient wireless multimedia communications

Interactive cellular and cordless video telephony: State-of-the-art system design principles and expected performance

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