Receiver performance for the North American Digital Cellular system

Larsson, G.; Gudmundson, B.; Raith, K.

doi:10.1109/vetec.1991.140433

Cited by 26 publications

(4 citation statements)

References 4 publications

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“…The channel is initially estimated using the training sequence. An initial estimate can be obtained using the time‐invariant approaches, such as the correlation 17, 94, 99, 125, 126, LS 111 or ML 110 approaches. This initial estimate can be refined by performing tracking over the training sequence 17, 94, 95.…”

Section: Data‐directed Trackingmentioning

confidence: 99%

Channel estimation in narrowband wireless communication systems

Arslan¹,

Bottomley²

2001

Wireless Communications

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Channel estimation is an integral part of standard adaptive receiver designs used in narrowband, digital wireless communication systems. In this tutorial paper, commonly used approaches to channel estimation are reviewed. Both time‐invariant and time‐varying channels are considered. For time‐varying channels, both pilot symbol interpolation and data‐directed channel tracking are considered. Applications include the Global System for Mobile communications, the Enhanced Data rates for Global Evolution system, and another Time‐Division Multiple‐Access system known as Telecommunications Industry Association/Electronics Industry Association/Interim Standard—136 (TIA/EIA/IS‐136 or IS‐136). Copyright © 2001 John Wiley & Sons, Ltd.

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Section: Data‐directed Trackingmentioning

confidence: 99%

Channel estimation in narrowband wireless communication systems

Arslan¹,

Bottomley²

2001

Wireless Communications

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“…A few years after the definition of the Pan-European digital mobile radio system known as GSM [ I ] other srcond generation mobile systems such as the American IS-54 [2] and the Japanese system [3] followed. The key features of these systems are summarised in Table 1, including the half-rate GSM system.…”

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confidence: 99%

On QAM Speech Transmission Schemes for Microcellular Mobile PCNs

Hanzo¹,

Webb²,

Steele³

et al. 1993

Trans Emerging Tel Tech

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Abstract. On the way towards third generation personal communication networks (PCN) the deployment of 16-level quadrature amplitude nlodulation ( Q A W schemes is investigated via flat microcellular Rayleiph-fading mobile radio channels having mild co-channel interference with and without diversity. Our proposed differentially coded non-coherent 16-QAM scheme requires no pilot symbol assistance. no automatic gain control (AGC) and no carrier recovery. High speech quality associated with a mean opinion score of about four (MOS = 4.0) is ensured at a signalling rate of 6.1 kBd for channel signal to noise ratios tSNR) above 30 -25 dB and signal to interference ratios (SIR) above 75 -30 dB by the 13.4 kbit/s medium complexity resular pulse excited (RPE) speech codec, when carefully matched twin-class low complexity binary Bose-ChaudhuriHocquenghem (BCHI error correction coding and 16-QAM combined with second order diversity are deployed. The overall speech delay is about 10 Ins and the user bandwidth is 9.3 kHz. which allows us to accommodate 2 1 users in a 300 kHz channel slot.A few years after the definition of the Pan-European digital mobile radio system known as GSM [ I ] other srcond generation mobile systems such as the American IS-54 [2] and the Japanese system [3] followed. The key features of these systems are summarised in Table 1, including the half-rate GSM system. While the GSM system is a complex scheme for hostile, dispersive land mobile channels. the other two systems were contrived for more benign channels and represent a different design philosophy. Indeed. the IS-54 and the Japanese digital mobile systems provide a seamless conceptual transition towards the third peneration personal communications network (PCN) concept. where the friendly micro-or pico-cellulu environment guarantees high signal-to-noise ratios (SIVR) and low signal dispersion. The typically high SNR can be exploi- ted by deploying 16-level quadrature amplitude modulation (IBQAM), which lowers the signalling rate by a factor of four and hence quadruples the signalling interval's duration. Therefore the relative effects of signal dispersion are mitigated and the need for channel equalization can be removed.The paper is organised as follows. Section 2 gives a brief overview of QAM research for both Gaussian and Rayleigh fiiding channels and highlights the key features of two previously proposed QAM-based mobile communication schemes for PCN in contrast to the presently suggested system. Section 3 hishlights our proposed non-coherent differentially coded 16-QAM modem. Section 4 concentrates on the RPE speech codec and after a theoretical treatise it provides a rigourous bit sensitivity analysis based on a sensitivity measure derived from the amalgamation of segmental SNR (SEG-SNR) and cepstral distance (CD) measures. Section 5 deals with aspects of channel coding. while Section 6 describes the combined transceiver scheme proposed. Lastly. Section 7 summarises our results and provides some discussions.

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“…From [9], a diversity gain of 6.8 dB (at the BER corresponding to 17 dB C/I without diversity) was reported. This effectively moves the outage threshold to 10.2 dB.…”

Section: B With Diversitymentioning

confidence: 99%

Realizing intermediate reuse factors for capacity evaluation

Bottomley

Haartsen²

Proceedings of IEEE Vehicular Technology Conference (VTC)

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The goal of many cellular system studies is the capacity evaluation and comparison of planned cellular systems. The capacity definition includes multiple quality requirements which must be met, such as a blocking probability for new calls and an outage probability for connected calls. The reuse factor and Erlang loading of each cell are adjusted so that all quality criteria are met. However, some quality criteria are exceeded.This makes capacity comparisons difficult, since systems may be compared with different qualities. One of the problems is that the site reuse factor can only take on a restricted number of values, e.g. 1,3,4,7 .... This paper proposes a practical method for obtaining intermediate reuse values, so that multiplequality criteria can be more closely met. This is achieved by partitioning the total channel set into two subsets, each subset being allocated with a different reuse factor. Such an approach is physically realizable and straightforward to use in capacity evaluation simulations. Also, the approach can be extended to provide a continuum of reuse values. As an example, this method is applied to evaluate the capacity benefit of receive antenna diversity for the American Digital Cellular (ADC) standard.

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Receiver performance for the North American Digital Cellular system

Cited by 26 publications

References 4 publications

Channel estimation in narrowband wireless communication systems

Channel estimation in narrowband wireless communication systems

On QAM Speech Transmission Schemes for Microcellular Mobile PCNs

Realizing intermediate reuse factors for capacity evaluation

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