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The fading number of IID MIMO Gaussian fading channels with a scalar line-of-sight component

by Stefan M. Moser - in Proceedings Forty-Fifth Allerton Conference on Communication, Control and Computing, Allerton , 2007
"... Abstract — The capacity of regular noncoherent fading chan-nels grows like log log SNR + χ at high signal-to-noise ratios (SNR). Here, χ, denoted fading number, is a constant indepen-dent of the SNR, but dependent on the distribution of the fading process. Recently, an expression of the fading numbe ..."
Abstract - Cited by 1 (0 self) - Add to MetaCart
number has been derived for the situation of general memoryless multiple-input multiple-output (MIMO) fading channels. In this paper, this expression is evaluated in the special situation of an independent and identically distributed MIMO Gaussian fading channel with a scalar line-of-sight component d

A Study of a Land Mobile Satellite Channel Model with Asymmetrical Doppler Power Spectrum and Lognormally Distributed Line-of-Sight Component

by Matthias Pätzold, Yingchun Li, Frank Laue , 1996
"... In satellite to mobile communications, there is generally in addition to the diffuse multipath component a strong line-of-sight component present. The spectral and statistical properties of both components are influenced by shadowing caused by obstacles such as trees, houses or small buildings. In t ..."
Abstract - Cited by 11 (1 self) - Add to MetaCart
In satellite to mobile communications, there is generally in addition to the diffuse multipath component a strong line-of-sight component present. The spectral and statistical properties of both components are influenced by shadowing caused by obstacles such as trees, houses or small buildings

Capacity study of vehicle-to-roadside MIMO channels with a line-of-sight component

by Michail Matthaiou, David I. Laurenson, Cheng-xiang Wang - in Proc. IEEE Wireless Commun. Networking Conf , 2008
"... Abstract—In this paper, the performance of a Multiple-Input Multiple-Output (MIMO) system is assessed in the case of vehicle-to-roadside communications. We investigate a Line-of-Sight (LoS) scenario where a specular wavefront impinges on the receive side. Under these conditions, the channel response ..."
Abstract - Cited by 8 (5 self) - Add to MetaCart
Abstract—In this paper, the performance of a Multiple-Input Multiple-Output (MIMO) system is assessed in the case of vehicle-to-roadside communications. We investigate a Line-of-Sight (LoS) scenario where a specular wavefront impinges on the receive side. Under these conditions, the channel

Parameter Optimization for OFDM Systems in Doubly-Selective Fading Channels with Line-of-Sight Components

by Heidi Steendam
"... Abstract — In wireless communications, the channel can often be modelled as a time-selective frequency-selective fading channel with line-of-sight (LOS) component. Although orthogonal frequency division multiplexing (OFDM) systems are developed to cope with the frequency selectivity of the channel, ..."
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Abstract — In wireless communications, the channel can often be modelled as a time-selective frequency-selective fading channel with line-of-sight (LOS) component. Although orthogonal frequency division multiplexing (OFDM) systems are developed to cope with the frequency selectivity of the channel

Impact of the Line-of-Sight Propagation Component on the Orthogonality Factor of the Synchronous DS-CDMA Uplink

by Ieice Trans , Commun
"... SUMMARY This paper investigates a modifying orthogonality factor for synchronous DS-CDMA uplink in dispersive Rician multipath fading channels, which reflects upon the effects of specular path power as well as decaying channel characteristics. Using this investigation, the orthogonal factors in ind ..."
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in indoor environments are evaluated and compared with the various parameters such as decaying factor, line-of-sight component, and the number of multipaths.

Line-of-sight percolation

by Béla Bollobás, Svante Janson, Oliver Riordan , 2008
"... Given ω ≥ 1, let Z 2 (ω) be the graph with vertex set Z 2 in which two vertices are joined if they agree in one coordinate and differ by at most ω in the other. (Thus Z 2 (1) is precisely Z 2.) Let pc(ω) be the critical probability for site percolation on Z 2 (ω). Extending recent results of Frieze, ..."
Abstract - Cited by 31 (5 self) - Add to MetaCart
, Kleinberg, Ravi and Debany, we show that limω→ ∞ ωpc(ω) = log(3/2). We also prove analogues of this result for the n-by-n grid and in higher dimensions, the latter involving interesting connections to Gilbert’s continuum percolation model. To prove our results, we explore the component of the origin in a

A Partial Ordering Relation on Flat-Fading Channels

by Majid Fozunbal, Steven W. Mclaughlin, Ronald W. Schafer , 2004
"... In this correspondence, we establish a partial ordering framework to compare flatfading channels in a capability sense, which is based on the relative dominance of their mutual information functions over a convex set of input distributions. For this purpose, we address the effect of the line-of-sigh ..."
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and scattering components on the mutual information of flat-fading channels. For example, we show that in the presence of channel state information (CSI) at the receiver, the mutual information of flat-fading channels is monotonically increasing with respect to the absolute value of the line-of-sight component

1Cooperative space-time coded transmissions in Nakagami-m fading channels

by S. Savazzi, U. Spagnolini
"... Abstract—In this paper we evaluate outage performance of a cooperative transmission protocol over fading channels that requires a number of relaying nodes to employ a distributed space-time coding scheme. Diversity provided by this technique has been widely analyzed for the Rayleigh fading case. How ..."
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. However, ad-hoc and sensors networks often experience propagation envi-ronments where the line-of-sight component is either non zero or, in some cases, dominates compared to the random non line-of-sight components. By considering the Nakagami-m as a generic framework for describing the statistic

CDMA Sparse Channel Estimation Using a GSIC/AM Algorithm for Radiolocation

by Sunwoo Kim, Timothy Pals, Ronald A. Iltis, Hua Lee
"... This paper considers channel parameter estimation in a sparse channel environment for radiolocation. The generalized successive interference cancellation (GSIC) algorithm is used to eliminate the multiple access interference (MAI). To adapt GSIC to sparse channels the alternating maximization (AM) a ..."
Abstract - Cited by 1 (0 self) - Add to MetaCart
) algorithm is considered and the continuous time delay of each path is estimated. The time-of-arrival (TOA) of the first arrival ray is treated as the line-of-sight component. The TOAs from multiple reference nodes to a master node are then used to compute master node position.

Adaptive Rate and Power DS/CDMA Communications in Fading Channels

by Sang Wu Kim , 1999
"... We investigate the average information rates attained by adapting the transmit power and the information rate relative to channel variations in code division multiple access communication systems. Our results show that the rate adaptation provides a higher average information rate than the power ada ..."
Abstract - Cited by 6 (0 self) - Add to MetaCart
adaptation for a given average transmit power, and the rate increase when using rate adaptation is more significant for channels with a faster decaying multipath intensity profile and weaker line-of-sight component. Index Terms---Adaptation, CDMA, fading. I.
Results 1 - 10 of 1,855