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Directional Random Scattering MIMO Channels: Entropy Analysis and Capacity Optimization
 

Summary: Directional Random Scattering MIMO Channels:
Entropy Analysis and Capacity Optimization
Parastoo Sadeghi, Thushara D. Abhayapala, and Rodney A. Kennedy
Research School of Information Sciences and Engineering (RSISE)
The Australian National University
Canberra ACT 0200 Australia
Emails: {parastoo.sadeghi};{thushara.abhayapala};{rodney.kennedy}@anu.edu.au
Abstract-- In this paper, we study the effect of directional ran-
dom scattering on the capacity of multiple-input multiple-output
(MIMO) systems. First, we use the spatial decomposition of the
MIMO channel matrix to analyze the randomness (entropy)
of directional scattering. The analysis shows that directional
scatterers (with at least a null in the angular power spectrum)
will no longer be random when the receiver observation radius
is sufficiently large. Therefore, directional scattering limits the
expected linear increase of MIMO capacity with increasing the
number of antennas. Second, we consider the effect of receiver
antenna arrangement (positions) on the capacity of MIMO
systems. For any random scatterer with a given angular power
spectrum, we show that it is possible to choose the receiver

  

Source: Abhayapala, Thushara D. - Department of Information Engineering, Australian National University
Sadeghi, Parastoo - Department of Information Engineering, Australian National University

 

Collections: Computer Technologies and Information Sciences; Engineering