Proceedings ArticleDOI
Colocated antenna arrays: design desiderata for wireless communications
S. Visuri,Dirk Slock +1 more
- pp 580-584
TLDR
This paper addresses the problem of designing the colocated antenna array response for two applications: diversity reception using maximum ratio combining and MIMO communication capacity, and evaluates the performance of two opposite extremes in terms of design: very selective beamspace type of operation versus spatially allpass antennas.Abstract:
We report on in this paper is motivated by the drive towards antenna array miniaturization: going from an array of identical antennas that get spread out in space towards an array of colocalized antennas with differing responses. We address the problem of designing the colocated antenna array response for two applications: diversity reception using maximum ratio combining and MIMO communication capacity. The design criteria are derived under specific models regarding the distribution of the parameters of the frequency flat channel. We are particularly interested in evaluating the performance of two opposite extremes in terms of design: very selective beamspace type of operation versus spatially allpass antennas. We also show that the pathwise channel model converges for large number of paths to the stochastic channel model with separable correlation between TX and RX sides.read more
Citations
More filters
Patent
System and methods for planned evolution and obsolescence of multiuser spectrum
Stephen G. Perlman,A. Forenza +1 more
TL;DR: In this article, a system and method are described which enable planned evolution and obsolescence of multiuser wireless spectrum, where one or multiple centralized processors and multiple distributed nodes communicate via wireline or wireless connections.
Patent
System and methods to compensate for Doppler effects in multi-user (MU) multiple antenna systems (MAS)
A. Forenza,Stephen G. Perlman +1 more
TL;DR: In this paper, a system and methods are described which compensate for the adverse effect of Doppler on the performance of DIDO systems, which employs different selection algorithms to adaptively adjust the active BTSs to different UEs based by tracking the changing channel conditions.
Journal ArticleDOI
Benefit of pattern diversity via two-element array of circular patch antennas in indoor clustered MIMO channels
A. Forenza,Robert W. Heath +1 more
TL;DR: This paper analytically derives the spatial correlation coefficients of this array as a function of the mode excited, for realistic clustered MIMO channel models, and compares the performance of the circular patch array (CPA) against an array of two spaced dipoles.
Patent
Systems and methods to coordinate transmissions in distributed wireless systems via user clustering
TL;DR: In this article, link quality measurements between a target user and a plurality of distributed-input-distributed-output (DIDO) distributed antennas of base transceiver stations (BTSs) were used to define a user cluster, and the channel state information (CSI) between each user and each DIDO antenna within a defined user cluster was measured.
Patent
System and method for distributed antenna wireless communications
TL;DR: In this article, a system and method for distributed antenna wireless communications is described, in which the precoding causes radio frequency interference between the plurality of base stations but simultaneously generates a plurality of noninterfering radio frequency user channels between the majority of distributed antennas and the plurality wireless client devices.
References
More filters
Journal ArticleDOI
Capacity of Multi‐antenna Gaussian Channels
TL;DR: In this paper, the authors investigate the use of multiple transmitting and/or receiving antennas for single user communications over the additive Gaussian channel with and without fading, and derive formulas for the capacities and error exponents of such channels, and describe computational procedures to evaluate such formulas.
Journal ArticleDOI
Spatio-temporal coding for wireless communication
TL;DR: This paper shows that the presence of multipath greatly improves achievable data rate if the appropriate communication structure is employed, and an adaptive-lattice trellis-coding technique is suggested as a method for coding across the space and frequency dimensions that exist in the DMMT channel.
Journal ArticleDOI
Capacity scaling in MIMO wireless systems under correlated fading
TL;DR: Results show that empirical capacities converge to the limit capacity predicted from the asymptotic theory even at moderate n = 16, and the assumption of separable transmit/receive correlations via simulations based on a ray-tracing propagation model is analyzed.
Proceedings ArticleDOI
MIMO wireless channels: capacity and performance prediction
TL;DR: A new model for multiple-input multiple-output (MIMO) outdoor wireless fading channels is presented which is more general and realistic than the usual i.i.d. model and it is shown that even at long ranges high channel rank can easily be obtained under mild scattering conditions.
On the expectation of the product of four matrix-valued Gaussian random variables
P.H.M. Janssen,Petre Stoica +1 more
TL;DR: In this paper, the expectation of the product of four scalar real Gaussian random variables is generalized to matrix-valued (real or complex) Gaussian Random Variables, and a simple derivation of the covariance matrix of instrumental variable estimates of parameters in multivariable regression models is presented.