A statistical model for land mobile satellite channels and its application to nongeostationary orbit systems

Corazza, G.E.; Vatalaro, Francesco

doi:10.1109/25.312773

Cited by 331 publications

(165 citation statements)

References 5 publications

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“…The PDF f sel (γ) for the SC output can be obtained by differentiating (2), which results in Performance Analysis of Selecting Maximal Ratio Combining Hybrid Diversity System over Ricean Fading Channels P. C. Spalevic et al…”

Section: Fig 1 Hybrid Selection Maximal Ratio Combining Diversity Smentioning

confidence: 99%

“…The Rician fading is also applicable for modeling the fading channels in frequency domain [1]. In particular, for mobile satellite communications, the Rician distribution is used to accurately model the mobile satellite channel for single [2], clear-state [3] channel conditions. An efficient method for mitigating fading effects by using multiple receiver antennas is called space diversity.…”

Section: Introductionmentioning

confidence: 99%

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Performance Analysis of Selecting Maximal Ratio Combining Hybrid Diversity System over Ricean Fading Channels

Spalević¹,

Stefanović²,

Panic³

et al. 2014

Automatika

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In this paper an approach to the performance analysis of hybrid MRCS (Selection Maximal Ratio Combining) diversity system operating over Ricean fading channels is presented. Hybrid MRCS combining method has a simple implementation, where maximal-ratio combined signals are chosen on a selection combining basis. Closed form expressions are provided for standard first and second order statistical measures for the signal at the output of the combiner, i.e. PDF (probability density function), CDF (cumulative distribution function), LCR (level crossing rate). Capitalizing on them standard performance measures like ABEP (Average Bit Error Probability) over some modulation techniques and AFD (Average Fade Duration) are efficiently evaluated and discussed in the function of various system parameters.

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Section: Fig 1 Hybrid Selection Maximal Ratio Combining Diversity Smentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Selecting Maximal Ratio Combining Hybrid Diversity System over Ricean Fading Channels

Spalević¹,

Stefanović²,

Panic³

et al. 2014

Automatika

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“…The shadowing can be viewed by averaging the received signal over some tens of wavelengths along a particular radial distance [3]. Shadowing is often modeled, for mathematical convenience, as a slow-varying, log-normal random variable multiplied to the short-term fading [1,39,40], and this type of shadowing is referred to as the multiplicative shadowing [41]. The log-normal distribution becomes a Gaussian distribution when the shadowing is represented in decibel scale [1].…”

Section: Propagation Modeling In the Mobile Channelmentioning

confidence: 99%

Absolute phase in mobile channels

Ren¹,

Vaughan²

2011

Wireless Communications

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Radio channels are usually modeled as a well‐defined Rice process. The statistics of its wrapped phase (i.e., phase values in [−π,π)), such as the mean, variance, and probability density function (pdf), are known. The absolute phase, i.e., the accumulated phase change over an observation interval, is considered here as a new channel variable. Its use for channel characterization can extend to cognitively track users. However, there is very little knowledge about the statistics of the absolute phase. In fact, the known, associated effects of the absolute phase, such as various click noise contributions, are not consistently treated or interpreted in the literature. The definitions of absolute phase, based on both unwrapping and on other methods previously discussed for FM receivers, lay a basis for analysis of the mean, variance, and pdf of the absolute phase for a well‐defined Rice process. The conditions are identified for approximate pdf models to hold, and it is noted that pdfs for the absolute phase for small or medium Rice factor and small observation interval are open problems. Simulations are used to support the analysis and discussion. Copyright © 2009 John Wiley & Sons, Ltd.

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“…Each user's transmitter sends its modulated VBR MC-SS signal over a 64 MHz bandwidth portion that is the fixed amount of bandwidth assigned for transmission. According with the measurements exposed in [6], we consider the delay spread m τ equal to 100 nsec that corresponds to a coherence bandwidth of 10 MHz. This means that we can resolve up to seven separated paths [11].…”

Section: Channel Modelling and Equalisationmentioning

confidence: 99%

Performance evaluation of MC-CDMA techniques for variable bit-rate transmission in LEO satellite networks

Sacchi

Gera²,

Regazzoni³

ICC 2001. IEEE International Conference on Communications. Conference Record (Cat. No.01CH37240)

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This work1 is aimed at investigating the use of Multi Carrier CDMA (MC-CDMA) techniques in variable bitrate transmission over low-earth-orbit (LEO) satellite channels by means of realistic simulations. It is known by literature that MC-CDMA techniques are much more resilient with respect to multi-user interference effects in multipath fading channels than single-carrier DS/CDMA ones. Moreover, MC-CDMA exhibits a natural capability to deliver multirate services simply by assigning to each user a variable-cardinality set of subcarriers. The achieved simulation results clearly confirmed the expected improved robustness of MC-CDMA techniques transmitting multirate data streams in frequency selective LEO satellite channels, with respect to state-of-the-art DS/CDMA transceivers. INTRODUCTIONIn these last years, the a considerable amount of R&D activities were carried on about the actual applications of Spread Spectrum and CDMA techniques to satellite communication systems working both on geo-stationary (GEO) and low-earth-orbit (LEO) constellations [1]. The advantages involved by the use of CDMA techniques in wireless communications are well known. The main problem involved by the use of CDMA in the satellite environment consists in the heavy limitation of capacity due to multi-user interference (MUI). This kind of disturbance is particularly severe in the upstream direction of low-earth-orbit (LEO) satellite channels, which are affected by propagation impairments, multipath fading, and near-far degradation quite similar to the one affecting the terrestrial pointed out a significant improvement of the BER performances and capacity yielded by a MC-CDMA system, with respect to a DS/CDMA system using a rake receiver, working in the same condition of asynchronous transmission over an indoor wireless multipath channel and absence of power control. This improvement is due to the orthogonality inherent to MC-CDMA techniques, which is retained also in multipath fading channels [4]. This fact is not verified for DS/CDMA systems, because multipath fading destroys the orthogonality of user codes and the resulting MUI may render symbol recovery impossible. In [9] an actual example of multi-code DS/CDMA satellite modem working over the Ka-band is dealt. Even though, the geostationary Ka-band channel exhibits a slow nonselective fading, the capacity of the system in terms of number of codes allowed to simultaneous transmission is strongly reduced by multi-user interference. The solution considered in [9] for improving system capacity was the introduction of a trained LMSE multi-user detection algorithm. Another solution considered in literature is to

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A statistical model for land mobile satellite channels and its application to nongeostationary orbit systems

Cited by 331 publications

References 5 publications

Performance Analysis of Selecting Maximal Ratio Combining Hybrid Diversity System over Ricean Fading Channels

Performance Analysis of Selecting Maximal Ratio Combining Hybrid Diversity System over Ricean Fading Channels

Absolute phase in mobile channels

Performance evaluation of MC-CDMA techniques for variable bit-rate transmission in LEO satellite networks

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