Propagation characteristics on microcellular urban mobile radio channels at 910 MHz

Bultitude, R.J.C.; Bedal, G. K.

doi:10.1109/49.16841

Cited by 214 publications

(14 citation statements)

References 16 publications

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“…Experimental measurements performed at different frequency bands, e.g. for terrestrial mobile systems at 900 MHz [10] and for indoor wireless channels at 1.9 GHz [11], 2.4 GHz [12] and 5 GHz [13] also confirm that the temporal envelope fading is best fit by Rician distribution.…”

Section: Introductionsupporting

confidence: 61%

Performance of Single and Multichannel Coherent Reception under Rician Fading

Chandra

Bose

2009

Int J Wireless Inf Networks

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In the present work, simple closed-form series solutions for the average error rate of several coherent modulation schemes such as, binary phase shift keying (BPSK), binary frequency shift keying (BFSK), differential binary phase shift keying (DBPSK), quadrature phase shift keying (QPSK), offset-QPSK, minimum shift keying (MSK), and square M-ary quadrature amplitude modulation (M-QAM), operating over frequency non-selective slow Rician fading channel and corrupted by additive white Gaussian noise (AWGN) are derived. Further, to improve the link quality, receiver antenna space diversity is considered, where multiple independent and identically distributed (i.i.d.) as well as uncorrelated signal replicas are combined before successive demodulation. The proposed linear predetection combiner follows optimum maximal ratio combining (MRC) algorithm. Starting from a novel unified expression of conditional error probability the error rates are analysed using probability density function (pdf) based approach. The derived end expressions, consisting of rapidly converging infinite series summations of Gauss hypergeometric function, are accurate, free from any numerical integration and general enough, as it encompasses as special situations, some cases of non-diversity, non-fading AWGN and Rayleigh fading. Symbol or, bit error probabilities (SEP/BEP) are graphically displayed against signal to noise ratio (SNR) per bit per channel for all the digital modulation schemes stated above with different values of diversity order L and varying values of the channel specular-to-scatter ratio or, the Rician parameter K, as found from the measured statistics of mobile and indoor wireless channels. In addition, to examine the dependence of error rate performance of M-QAM on the constellation size M, numerical results are plotted for various values of M. Selected simulation results are also provided to verify the analytical deductions. The series solutions presented in current text realize a trade-off between precision and complexity and offers valuable insight into the performance evaluation over a fading channel in a unified manner.

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Section: Introductionsupporting

confidence: 61%

Performance of Single and Multichannel Coherent Reception under Rician Fading

Chandra

Bose

2009

Int J Wireless Inf Networks

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“…Usually, the K factor is given in dB. It was reported in Reference [11] that a typical value of K for a microcellular environment is about 7 dB. The local mean received power is…”

Section: The Pdf Of the Snrmentioning

confidence: 99%

MGF for gamma‐shadowed ricean fading channel

Kostić

2007

Trans Emerging Tel Tech

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The moment-generating function (MGF) of the received signal-to-noise ratio (SNR) is a convenient tool in the performance analysis of modulation schemes in fading channels. In this letter, we derive the MGF for gamma-shadowed Ricean fading channels under the assumption that the average power of the Ricean fading is characterised by a gamma distribution. The MGF is expressed in a series form. An application of the derived MGF for evaluating the average bit error probability (ABEP) for binary differential phase-shift keying (DPSK) is given. The exact expression for ABEP and the corresponding asymptotic expression (assuming large SNR) are derived and mutually compared. The computational efficiency is elaborated on. Special cases of the exact expression for ABEP agree with corresponding known results.

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“…For microcell systems, however, its validity is in question. For instance, in a microcell environment an undesired signal from a distant cochannel cell may well be modelled by Rayleigh statistics, but Rayleigh fading may not be a good assump tion for the desired signal, since a line-of-sight path may exist within a microcell [3], [15]. Therefore, in this situation different fading statis tics are needed to characterize the desired and undesired signals in a microcell radio system.…”

Section: Introductionmentioning

confidence: 99%

Cochannel interference modelling and performance analysis of microcell systems for wireless personal communications

Yao¹,

Sheikh²

1994

Can. J. Electr. Comput. Eng.

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Cochannel interference in microcell radio systems with frequency-selective fading is investigated in this paper. Two microcell cochannel interference models, the Rician/Rayleigh model and the Rician/Rayleigh-plus-lognormal model, are presented. In the first model, the desired signal within a microcell experiences Rician fading while interfering signals from cochannel cells are subject to Rayleigh fading. In the second model, the cochannel interfering signals are subject to superimposed Rayleigh fading and lognormal shadowing. Frequency-selective multipath fading is considered in both models. The probability density function of the power ratio between the desired signal and composite interferers is derived. In evaluating the composite interference, both coherent and noncoherent interference addition are considered. Using the probability density function of the signal-to-interference ratio, expressions of the system outage probability are derived. Microcell systems are compared with medium/large-cell systems in terms of the outage probability. It is shown that the former outperform the latter. The effect of frequency-selective multipath fading and that of shadowing on the outage probability are observed. The issue of cochannel reuse distance is studied and the relation between the outage probability and the reuse distance is examined. An "irreducible outage probability" due to frequency-selective multipath fading is observed.Dans cet article, nous analysons l'interférence entre les canaux des systèmes microcellulaires en présence d'évanouissements sélectifs en fréquence. Deux modélisations de l'interférence entre canaux sont proposées: la première utilise le modèle de Rice/Rayleigh et la seconde utilise le modèle de Rice/Rayleigh incluant l'affaiblissement Log-Normal. Dans le premier modèle, le signal utile à l'intérieur d'une cellule donnée est soumis à des affaiblissements de type Rice tandis que les signaux interférents provenant des autres canaux sont soumis à des affaiblissements de Rayleigh. Dans le second modèle, les signaux interférents provenant des autres canaux sont soumis à la fois à des affaiblissements de Rayleigh et à des phénomènes d'ombrage de type Log-Normal. Pour ces deux modèles, nous considérons également des évanouissements sélectifs en fréquence introduits par les phénomènes de multi-trajets. Une expression de la fonction de densité de probabilité du rapport de la puissance du signal utile à la puissance des signaux interférents est également donnée. Lors de l'évaluation du signal interfèrent composite, nous avons considéré à la fois des interférences additives cohérentes et noncohérentes. À partir de la fonction de densité de probabilité du rapport Signal à Interférents, nous dérivons des expressions de la probabilité de coupure. Cette dernière est ensuite utilisée pour comparer les performances des systèmes microcellulaires avec celles des systèmes cellulaires moyens/grands. Nous montrons que le premier système donne de meilleures performances que le second. Les effets des évanouissements s...

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Propagation characteristics on microcellular urban mobile radio channels at 910 MHz

Cited by 214 publications

References 16 publications

Performance of Single and Multichannel Coherent Reception under Rician Fading

Performance of Single and Multichannel Coherent Reception under Rician Fading

MGF for gamma‐shadowed ricean fading channel

Cochannel interference modelling and performance analysis of microcell systems for wireless personal communications

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