Analysis of MIMO capacity gains for indoor propagation channels with LOS component

Hütter, Andreas; Platbrood, F.; Ayadi, Jaouhar

doi:10.1109/pimrc.2002.1045246

Cited by 25 publications

(6 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In [4] the possibility of enhancing performance by considering the array geometry when a strong line-of-sight (LOS) component is present is discussed. Further, expressions for reasonable placement of the antennas in parallel uniform linear arrays (ULAs) are introduced in [5] and [6], while some numerical investigations are presented in [7] and [8].…”

Section: Introductionmentioning

confidence: 99%

Design of Optimal High-Rank Line-of-Sight MIMO Channels

Bohagen

Orten

Oien

2007

IEEE Trans. Wireless Commun.

283

183

View full text Add to dashboard Cite

This paper describes a technique for realizing a high-rank channel matrix in a line-of-sight (LOS) multiple-input multiple-output (MIMO) transmission scenario. This is beneficial for systems which are unable to make use of the originally derived MIMO gain given by independent and identically distributed (i.i.d.) flat Rayleigh fading subchannels. The technique is based on optimization of antenna placement in uniform linear arrays with respect to mutual information (MI). By introducing a new and more general 3-D geometrical model than that applied in earlier work, additional insight into the optimal design parameters is gained. We also perform a novel analysis of the sensitivity of the optimal design parameters, and derive analytical expressions for the eigenvalues of the pure LOS channel matrix which are valid also when allowing for non-optimal design. Furthermore, we investigate the approximations introduced in the derivations, in order to reveal when the results are applicable. The LOS matrix is employed in a Ricean fading channel model, and performance is evaluated with respect to the average MI and the MI cumulative distribution function. Our results show that even with some deviation from the optimal design, the LOS MIMO case outperforms the i.i.d. Rayleigh case in terms of MI.

show abstract

Section: Introductionmentioning

confidence: 99%

Design of Optimal High-Rank Line-of-Sight MIMO Channels

Bohagen

Orten

Oien

2007

IEEE Trans. Wireless Commun.

283

183

View full text Add to dashboard Cite

show abstract

“…Following from (2) and (4), but with the magnitude term in (2) replaced with a constant, the channel gain elements are 3 Individual antenna element's lob pattern and polarization type are not addressed here. For rotation invariance, circular polarization may be assumed.…”

Section: System Modelmentioning

confidence: 99%

Lattice Array Receiver and Sender for Spatially OrthoNormal MIMO Communication

Larsson

2005 IEEE 61st Vehicular Technology Conference

View full text Add to dashboard Cite

In this paper, Line-of-Sight (LoS) oriented Multiple Input Multiple Output (MIMO) communication is examined. It is shown, that two opposing rectangular (as well as square and linear) lattice antenna arrays achieves the maximum attainable channel capacity, when a certain distance-wavelength condition is fulfilled. A relationship for large number of antenna elements is derived that connects LoS MIMO with LoS SISO channel capacity, through array aperture, wavelength and number of array antenna elements. Furthermore, a sensitivity study is performed for the proposed MIMO array arrangement that reveals high robustness against various array and antenna element position errors. Sensitivity against reflections is also examined, with the conclusion that the studied MIMO scheme appears less sensitive to reflections than a SISO system. Keywords-Line-of-Sight, MIMO, Hadamard's maximum determinant problem, Microwave-link.I.

show abstract

“…Firstly, in free-space environments MIMO channel capacity naturally decreases according to an exponential form as the Tx-Rx separation distance increases due to the transition of the signal from near-field to far-field [5]. The second reason for the exponential form of the curve is that it captures the entire correlation-based behavior in an intuitive and useful metric for planning MIMO links, namely the LOS Distance to MIMO Deficiency (DtMDLOS).…”

Section: The Two-curve Mimo Performance Modelmentioning

confidence: 99%