scispace - formally typeset
Topic

Channel state information

About: Channel state information is a(n) research topic. Over the lifetime, 24615 publication(s) have been published within this topic receiving 400910 citation(s).

...read more

Papers
More filters

Journal ArticleDOI
Thomas L. Marzetta1Institutions (1)
TL;DR: A cellular base station serves a multiplicity of single-antenna terminals over the same time-frequency interval and a complete multi-cellular analysis yields a number of mathematically exact conclusions and points to a desirable direction towards which cellular wireless could evolve.

...read more

Abstract: A cellular base station serves a multiplicity of single-antenna terminals over the same time-frequency interval. Time-division duplex operation combined with reverse-link pilots enables the base station to estimate the reciprocal forward- and reverse-link channels. The conjugate-transpose of the channel estimates are used as a linear precoder and combiner respectively on the forward and reverse links. Propagation, unknown to both terminals and base station, comprises fast fading, log-normal shadow fading, and geometric attenuation. In the limit of an infinite number of antennas a complete multi-cellular analysis, which accounts for inter-cellular interference and the overhead and errors associated with channel-state information, yields a number of mathematically exact conclusions and points to a desirable direction towards which cellular wireless could evolve. In particular the effects of uncorrelated noise and fast fading vanish, throughput and the number of terminals are independent of the size of the cells, spectral efficiency is independent of bandwidth, and the required transmitted energy per bit vanishes. The only remaining impairment is inter-cellular interference caused by re-use of the pilot sequences in other cells (pilot contamination) which does not vanish with unlimited number of antennas.

...read more

5,634 citations


Journal ArticleDOI
TL;DR: It is shown that the fading correlation affects the MEA capacity by modifying the distributions of the gains of these subchannels, which depends on the physical parameters of MEA and the scatterer characteristics.

...read more

Abstract: We investigate the effects of fading correlations in multielement antenna (MEA) communication systems. Pioneering studies showed that if the fades connecting pairs of transmit and receive antenna elements are independently, identically distributed, MEAs offer a large increase in capacity compared to single-antenna systems. An MEA system can be described in terms of spatial eigenmodes, which are single-input single-output subchannels. The channel capacity of an MEA is the sum of capacities of these subchannels. We show that the fading correlation affects the MEA capacity by modifying the distributions of the gains of these subchannels. The fading correlation depends on the physical parameters of MEA and the scatterer characteristics. In this paper, to characterize the fading correlation, we employ an abstract model, which is appropriate for modeling narrow-band Rayleigh fading in fixed wireless systems.

...read more

2,522 citations


Proceedings ArticleDOI
Raymond Knopp1, Pierre A. Humblet1Institutions (1)
18 Jun 1995-
TL;DR: By examining the bit error-rate with antipodal signalling, it is shown that an increase in capacity over a perfectly-power controlled (Gaussian) channel can be achieved, especially if the number of users is large, and the inherent diversity in multiuser communications over fading channels is shown.

...read more

Abstract: We consider a power control scheme for maximizing the information capacity of the uplink in single-cell multiuser communications with frequency-flat fading, under the assumption that the users attenuations are measured perfectly. Its main characteristics are that only one user transmits over the entire bandwidth at any particular time instant and that the users are allocated more power when their channels are good, and less when they are bad. Moreover, these features are independent of the statistics of the fading. Numerical results are presented for the case of single-path Rayleigh fading. We show that an increase in capacity over a perfectly-power controlled (Gaussian) channel can be achieved, especially if the number of users is large. By examining the bit error-rate with antipodal signalling, we show the inherent diversity in multiuser communications over fading channels.

...read more

2,247 citations


Journal ArticleDOI
Andrea Goldsmith1, Pravin Varaiya2Institutions (2)
TL;DR: The Shannon capacity of a fading channel with channel side information at the transmitter and receiver, and at the receiver alone is obtained, analogous to water-pouring in frequency for time-invariant frequency-selective fading channels.

...read more

Abstract: We obtain the Shannon capacity of a fading channel with channel side information at the transmitter and receiver, and at the receiver alone. The optimal power adaptation in the former case is "water-pouring" in time, analogous to water-pouring in frequency for time-invariant frequency-selective fading channels. Inverting the channel results in a large capacity penalty in severe fading.

...read more

2,107 citations


Journal ArticleDOI
Ezio Biglieri1, J. Proakis2, Shlomo ShamaiInstitutions (2)
TL;DR: This paper describes the statistical models of fading channels which are frequently used in the analysis and design of communication systems, and focuses on the information theory of fading channel, by emphasizing capacity as the most important performance measure.

...read more

Abstract: In this paper we review the most peculiar and interesting information-theoretic and communications features of fading channels. We first describe the statistical models of fading channels which are frequently used in the analysis and design of communication systems. Next, we focus on the information theory of fading channels, by emphasizing capacity as the most important performance measure. Both single-user and multiuser transmission are examined. Further, we describe how the structure of fading channels impacts code design, and finally overview equalization of fading multipath channels.

...read more

1,968 citations


Network Information
Related Topics (5)
Rayleigh fading

15.9K papers, 297.2K citations

98% related
Telecommunications link

43.9K papers, 546.1K citations

97% related
Precoding

18.7K papers, 305.3K citations

97% related
Transmitter power output

15.2K papers, 283.3K citations

97% related
Zero-forcing precoding

3.5K papers, 76.5K citations

96% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20225
20211,122
20201,535
20191,492
20181,457
20171,577

Top Attributes

Show by:

Topic's top 5 most impactful authors

Mohamed-Slim Alouini

160 papers, 6.7K citations

Robert W. Heath

124 papers, 5.5K citations

Vincent K. N. Lau

122 papers, 4.5K citations

Shlomo Shamai

106 papers, 6K citations

David Gesbert

103 papers, 3.9K citations