Mobile Communication Systems

Parsons, J.D.; Gardiner, J.G.

doi:10.1007/978-1-4684-1526-1

Cited by 93 publications

(33 citation statements)

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“…Some example QCIF video sequences can also be viewed on the Web. 5 The results of these simulation-based experiments are plotted in Fig. 6.…”

Section: ) Comparison Of Qcif Resolution Color Videomentioning

confidence: 99%

“…The subject of mobile radio communications has reached a state of maturity over the past two decades, as indicated by the excellent monographs by Jakes [1], Lee [2]- [4], Parsons and Gardiner [5], Parsons [6], Pahlavan and Levesque [7], Feher [8], Goodman [9], Prasad [10], Rappaport [11], Garg and Wilkes [12], Gibbson [13], Glisic and Vucetic [14], Verdu [16], and Meyr et al [15]. Recent third-generation (3G) mobile research has been strongly motivated by the seminal contributions of Viterbi [17], while a range of European contributions were summarized in [18].…”

Section: A Introduction and Outlinementioning

confidence: 99%

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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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“…Some example QCIF video sequences can also be viewed on the Web. 5 The results of these simulation-based experiments are plotted in Fig. 6.…”

Section: ) Comparison Of Qcif Resolution Color Videomentioning

confidence: 99%

Section: A Introduction and Outlinementioning

confidence: 99%

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

2000

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“…The two systems operate in two different frequency bands so that no mutual interference among them exists. The total propagation loss L (dB) at distance r (km) from the base station in a typical cellular environment is given by [8] [9]:…”

Section: Introductionmentioning

confidence: 99%

On the Optimum Traffic Allocation in Heterogeneous CDMA/TDMA Networks

Perez-Romero

Sallent

Agustí

2007

IEEE Trans. Wireless Commun.

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Abstract-This paper presents the optimum user allocation in heterogeneous scenarios with CDMA and TDMA technologies in order to minimize the total outage probability in the uplink. An analytical model reflecting the different nature of the two access technologies is presented in order to formulate the optimization procedure. It is shown how the optimum allocation depends on the specific parameters of the two technologies, as illustrated with some representative results. The proposed optimization methodology is claimed to have applicability in the field of Common Radio Resource Management strategies for Beyond 3G networks.Index Terms-Common radio resource management (CRRM), heterogeneous networks, beyond 3G networks, code division multiaccess, time division multiaccess.

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“…In a typical mobile environment, the user and/or nearby objects are likely to be non-stationary resulting in a time varying received signal strength. For instance, a user who is moving (driving, walking) in a typical urban environment can be subjected to Rayleigh fading [4], and car1 experience deep signal fades of -20dB. This can cause problems for the adaptive algorithm, as it should be able to distinguish between drops in signal strength due to de-tuning and those from fading.…”

Section: Circuit Descriptionmentioning

confidence: 99%

“…The response time is mainly determined by the sampling rate, so by increasing the sampling rate the performance of the system should improve. Another approach being considered is the development of a more robust (intelligent) algorithm, which performs better in a time varying environment A well known method of reducing the effects of fading is the use of diversity reception techniques [4]. The proposed receiving system can easily be modified to accommodate space diversity, assuming the transceiver allows for employment of more than one receiving antenna.…”

Section: E-5mentioning

confidence: 99%

An adaptive microstrip patch antenna for use in portable transceivers

Rostbakken

Hilton

Railton

Proceedings of Vehicular Technology Conference - VTC

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This paper describes an adaptive frequency tunable microstrip patch antenna. The introduction of an adaptive feedback loop enables the patch antenna to optimise the antenna-feed impedance match. As a result, the performance of the antenna is less affected by external disturbances such as coupling to near by objects. Measurements evaluating the performance of the proposed antenna, in terms of transmitted power and bit error rate, are presented.

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Mobile Communication Systems

Cited by 93 publications

References 0 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

On the Optimum Traffic Allocation in Heterogeneous CDMA/TDMA Networks

An adaptive microstrip patch antenna for use in portable transceivers

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