Upper bound performance of adaptive modulation in a slow Rayleigh fading channel

Torrance, J.M.; Hanzo, Lajos

doi:10.1049/el:19960506

Cited by 70 publications

(61 citation statements)

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“…In [91], Torrance et al derived the analytical upperbound performance of such an adaptive quadrature amplitude modulation (AQAM) scheme over slow Rayleigh-fading channels, while in [94], an unequal protection phasor constellation for signaling the transmission scheme of the modem was proposed. The problem of appropriate power assignment in AQAM modems was discussed, e.g., by Morimoto et al [88] and by Chua and Goldsmith [82].…”

Section: B Multimode Video Transceiversmentioning

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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Section: B Multimode Video Transceiversmentioning

confidence: 99%

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

2000

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“…wanted signal power residual ISI power + effective noise power (3) where and is the transmitted signal at time which was assumed uncorrelated.…”

Section: Pseudo-snr Of the Dfementioning

confidence: 99%

“…The numerical method suggested by Torrance [3] is modified for this joint adaptive scheme by using the pseudo-SNR to yield the corresponding numerical mean BER performance: Fig. 2 using the assumptions in Section II.…”

Section: Numerical Average Upper-bound Performancementioning

confidence: 99%

“…Recent developments in AQAM over a narrow-band channel include contributions by Webb and Steele [1], Sampei et al [2], Torrance et al [3], and Goldsmith et al [4]. In these contributions the input SNR was used as the modem mode switching criterion which is not an adequate wide-band channel quality measure, where the transmission burst experiences both power fluctuations and intersymbol interference (ISI).…”

Section: Introductionmentioning

confidence: 99%

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Upper-bound performance of a wide-band adaptive modem

Wong

Hanzo

2000

IEEE Trans. Commun.

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Abstract-Adaptive modulation is applied in conjunction with a decision-feedback equalizer (DFE) in order to mitigate the effects of the slowly varying wide-band multipath Rayleigh fading channel in a noise-limited environment. An upper-bound mean bit-error rate and bits per symbol performance is introduced for this scheme by utilizing the pseudo signal-to-noise ratio at the output of the DFE in order to switch the modulation schemes on a burst-by-burst basis.

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“…The adaptive modulation is an efficient way to optimizing the transmission rate in response to the channel condition, and it promises to achieve low error rate and high data throughput simultaneously [2]. To utilize its advantages, this scheme is also expected to be a dominant technique for the future generation mobile communication systems.…”

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confidence: 99%

Bias Robust Channel Prediction for OFDM based Adaptive Modulation

Jung¹,

Jeon²,

Cha³

et al. 2006

2006 First International Conference on Communications and Electronics

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Abstract-Adaptive modulation in OFDM systems is receiving remarkable attention as a scheme for improving spectral efficiency and error performance simultaneously. A major issue of the system is the necessity of channel information feedback that raises a problem of propagation delays. Linear channel prediction with drawback of biasing effect has been previously proposed to overcome propagation delays. In this paper, to avoid biasing effect, we propose channel prediction based on interpolation. Simulation results show that the proposed scheme has noticeable benefits of not only spectral efficiency but also error performance in OFDM systems using adaptive modulation.

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Upper bound performance of adaptive modulation in a slow Rayleigh fading channel

Cited by 70 publications

References 1 publication

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

Upper-bound performance of a wide-band adaptive modem

Bias Robust Channel Prediction for OFDM based Adaptive Modulation

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