Multimedia Personal Communication Networks (PCN): System Design Issues

Raychaudhuri, Dipankar; Wilson, N.D.

doi:10.1007/978-1-4615-3144-9_17

Cited by 16 publications

(7 citation statements)

References 13 publications

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“…The corresponding framing structure was shown explicitly by Keller et al in [146] and [147] in the context of a TDD/OFDM WATM system, where the superimposed acknowledgment flag was portrayed along with the associated delay ramifications. For a detailed treatise on WATM developments, the reader is referred, e.g., to the work by Raychaudhuri and Wilson [157], [196], [158], and Toh [159]. We emphasize again that the design principles transpiring from this paper in the context of low-rate video codecs are equally applicable to the high-rate WATM arrangements of [146] and [147].…”

Section: B Multimode Video Transceiversmentioning

confidence: 94%

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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Section: B Multimode Video Transceiversmentioning

confidence: 94%

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

2000

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“…The Broad-band Indoor Wireless Communications Project of CITR (Canadian Institute for Telecommunications Research) is investigat ing the 20-60-GHz range of frequencies (millimetre waves) for indoor wireless systems that could support a variety of broad-band and nar row-band ISDN services. Table 1 shows some possible broad-band wireless services [9]- [12] with estimated bit rate (in Mb/s) and performance requirements. Many of these proposed broad-band services have variable bit rates and present bursty traffic loads to the network.…”

Section: Information Services and Their Requirementsmentioning

confidence: 99%

Wireless access to broad-band services through microcellular indoor systems

Falconer¹,

Stamatelos²

1994

Can. J. Electr. Comput. Eng.

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Wireless access to advanced communications services could offer significant advantages to future users requiring high transmission rates and an increased freedom of mobility. The purpose of this paper is to present a view of the nature of broad-band services that will be accessed through future indoor wireless systems based on microcells, as well as the underlying challenges, both architectural and technological.Un accès sans fil aux services avancés de communication pourrait offrir des avantages significatifs aux usagers futurs requérant d'importants taux de transmission et une liberté de déplacement accrue. L'objectif de cet article est de présenter une vision de la nature des services à large bande auquel on aura accès grâce aux futurs systèmes microcellulaires d'intérieur, de même que les défis technologiques et d'architecture de réseau sous-jacents.

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“…Raychaudhuri and Wilson [1] were the first to propose the wireless ATM concept, in 1992. The potential scenarios to use wireless ATM networks are local area networks, residential networks and access networks (with fixed or mobile terminals).…”

Section: Introductionmentioning

confidence: 99%

A New Hybrid ARQ-FEC Scheme For Wireless ATM Networks

Brito¹,

Bonatti²

2005

Journal of Communication and Information Systems

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Several research projects have been proposed in the last few years, such as: the WATMnet project, developed by NEC for personal multimedia networks in a micro-cellular environment with fixed and mobile terminals [28]; the Magic Wand (Wireless ATM Network Demonstrator) project, proposed by European Union ACTS (Advanced Communications Technologies and Services), for indoor environment with mobile terminals [2]; the BAHAMA project proposed by Bell Laboratories, for ad hoc local area networks with mobile terminals [3]; the SWAN (Seamless Wireless ATM Networks) developed by Bell Laboratories for indoor networks with picocellular environment and mobile terminals [4]; the ATMmobil project, proposed by a pool of universities and enterprises in Germany, considering four different scenarios: local area networks, mobile broadband cellular networks, residential networks, and fixed access networks [5].Abstract -Wired ATM (Asynchronous Transfer Mode) networks are designed taking into account an optical link in the physical layer. The main problem to implement a wireless ATM network is the fact that its radio link bit error rate is high and variable, demanding the use of an additional error control mechanism. The usual techniques for error control are ARQ (Automatic Repeat Request) and FEC (Forward Error Correction). ARQ works better than FEC if the channel bit error rate is low, and is worse if it is high, thus indicating that hybrid ARQ-FEC techniques can improve the radio link performance. A new hybrid ARQ-FEC scheme with multiple FEC states is proposed in this paper. The performance of the proposed scheme is compared with non-adaptive ARQ and FEC schemes, which have similar complexities, and with an ideal adaptive FEC scheme. It is shown that the proposed scheme works better than the nonadaptive schemes, and that the hybrid and the ideal adaptive FEC schemes have similar performances. Moreover, the hybrid scheme does not require an estimate of the bit error rate in the channel, leading to a less complex implementation.In general, the goal of wireless ATM networks is to provide the same characteristics of the wired ATM networks, in a transparent way, through a wireless link, for fixed or mobile terminals. Thus, wireless ATM networks must integrate several kinds of traffic with guaranteed quality of service. The main problems to make the wireless ATM networks feasible are related to the following research areas [3][6][7]: mobility management, multiple access protocol and error control in the wireless link.

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Multimedia Personal Communication Networks (PCN): System Design Issues

Cited by 16 publications

References 13 publications

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

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

Wireless access to broad-band services through microcellular indoor systems

A New Hybrid ARQ-FEC Scheme For Wireless ATM Networks

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