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- Alayon Glazunov, Andres, 1969-, et al.
(författare)
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On Some Optimal MIMO Antenna Coefficients in Multipath Channels
- 2011
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Ingår i: Progress in Electromagnetics Research B. - 1937-6472. ; 35, s. 87-109
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Tidskriftsartikel (refereegranskat)abstract
- This paper derives some optimum transmit and receive antenna coefficients in wireless multipath channels based on the spherical vector wave multimode expansion of the multiple-input multiple-output (MIMO) channel matrix. The derived antenna coefficients satisfy the following specific optimization criteria: (i) maximum MIMO mean effective link gain (link MEG) based on the multimode channel realizations or (ii) maximum MIMO link MEG based on the multimode correlation matrix or (iii) correlation minimization by diagonalization of the MIMO full-correlation matrix. It is shown that the proposed approach leads to matrix equations belonging to the nearest Kronecker product (NKP) problem family, which in general have no trivial solution. However, we show that exact solutions are provided to the posed NKP problems under the assumption of the Kronecker model for the MIMO full-correlation matrix. The results are illustrated by numerical examples. The proposed approach is a complement to existing antenna pattern analysis methods.
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| 2. |
- Kildal, Per-Simon, 1951, et al.
(författare)
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Cost-effective measurement setups for testing wireless communication to vehicles in reverberation chambers and anechoic chambers
- 2014
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Ingår i: 2014 IEEE Conference on Antenna Measurements and Applications, CAMA. - : Institute of Electrical and Electronics Engineers.
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Konferensbidrag (refereegranskat)abstract
- Autonomous (self-driving) cars will in a few years become a reality, driven by safety aspects. This will be made possible by reliable and secure wireless connections to the car via the wireless network, and directly from other vehicles in the close vicinity. Thereby OTA-testing becomes a big issue, both in multipath and Line-Of-Sight (LOS). The present paper proposes two compact and cost-effective test chambers that take account of the two limiting environments known as Rich Isotropic Multipath (RIMP) and Random-LOS. The randomness of the latter is associated with the unknown and arbitrarily distributed angle of arrival of the LOS in the horizontal plane, sometimes also having an unknown polarization, which thereby also become random.
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