Simultaneous Decoupling and Matching Technique for Short-Range MIMO

Kentaro MURATA; Naoki HONMA; Kentaro NISHIMORI; Naobumi MICHISHITA; Hisashi MORISHITA

doi:10.1587/transcom.2015EBP3463

Simultaneous Decoupling and Matching Technique for Short-Range MIMO

Kentaro MURATA, Naoki HONMA, Kentaro NISHIMORI, Naobumi MICHISHITA, Hisashi MORISHITA

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This paper presents a novel simultaneous decoupling and matching technique for transmitting (Tx) and receiving (Rx) ports in short-range multiple-input multiple-output (SR-MIMO) systems. The principal difference with conventional decoupling and matching network (DMN) approaches is that the proposed technique considers strong mutual coupling between closely-positioned Tx/Rx arrays, and the S-parameter variation due to the presence of each other's array. This technique has two stages; first, 180-degree hybrid couplers are connected to both Tx/Rx ports of a plane-symmetrical MIMO system. This decouples both Tx/Rx ports, and moreover, channels between them are orthogonalized. That is, the MIMO system is transformed into multi orthogonalized single-input single-output (SISO) systems. Second, Tx/Rx ports of each orthogonalized SISO system are simultaneously matched based on conjugate matching theory. Consequently, the transmission power of the short-range MIMO system is maximized. Numerical results show that the proposed technique realizes higher channel capacity than the conventional DMN; indeed it achieves the theoretically possible capacity. In addition to theoretical analyses, we provide an example for microstrip line (MSL) circuit implementation. This MSL model offers good simultaneous decoupling and matching performance yielding channel capacity comparable to that of an ideally-designed circuit model. This validates the implementation feasibility of the proposed technique.

Publication: IEICE TRANSACTIONS on Communications Vol.E99-B No.8 pp.1846-1858

Publication Date: 2016/08/01

Publicized

Online ISSN: 1745-1345

DOI: 10.1587/transcom.2015EBP3463

Type of Manuscript: PAPER

Category: Antennas and Propagation

Authors

Kentaro MURATA
  National Defense Academy
Naoki HONMA
  Iwate University
Kentaro NISHIMORI
  Niigata University
Naobumi MICHISHITA
  National Defense Academy
Hisashi MORISHITA
  National Defense Academy

Keyword

short-range MIMO, decoupling and matching network

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Kentaro MURATA, Naoki HONMA, Kentaro NISHIMORI, Naobumi MICHISHITA, Hisashi MORISHITA, "Simultaneous Decoupling and Matching Technique for Short-Range MIMO" in IEICE TRANSACTIONS on Communications, vol. E99-B, no. 8, pp. 1846-1858, August 2016, doi: 10.1587/transcom.2015EBP3463.
Abstract: This paper presents a novel simultaneous decoupling and matching technique for transmitting (Tx) and receiving (Rx) ports in short-range multiple-input multiple-output (SR-MIMO) systems. The principal difference with conventional decoupling and matching network (DMN) approaches is that the proposed technique considers strong mutual coupling between closely-positioned Tx/Rx arrays, and the S-parameter variation due to the presence of each other's array. This technique has two stages; first, 180-degree hybrid couplers are connected to both Tx/Rx ports of a plane-symmetrical MIMO system. This decouples both Tx/Rx ports, and moreover, channels between them are orthogonalized. That is, the MIMO system is transformed into multi orthogonalized single-input single-output (SISO) systems. Second, Tx/Rx ports of each orthogonalized SISO system are simultaneously matched based on conjugate matching theory. Consequently, the transmission power of the short-range MIMO system is maximized. Numerical results show that the proposed technique realizes higher channel capacity than the conventional DMN; indeed it achieves the theoretically possible capacity. In addition to theoretical analyses, we provide an example for microstrip line (MSL) circuit implementation. This MSL model offers good simultaneous decoupling and matching performance yielding channel capacity comparable to that of an ideally-designed circuit model. This validates the implementation feasibility of the proposed technique.
URL: https://globals.ieice.org/en_transactions/communications/10.1587/transcom.2015EBP3463/_p

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@ARTICLE{e99-b_8_1846,
author={Kentaro MURATA, Naoki HONMA, Kentaro NISHIMORI, Naobumi MICHISHITA, Hisashi MORISHITA, },
journal={IEICE TRANSACTIONS on Communications},
title={Simultaneous Decoupling and Matching Technique for Short-Range MIMO},
year={2016},
volume={E99-B},
number={8},
pages={1846-1858},
abstract={This paper presents a novel simultaneous decoupling and matching technique for transmitting (Tx) and receiving (Rx) ports in short-range multiple-input multiple-output (SR-MIMO) systems. The principal difference with conventional decoupling and matching network (DMN) approaches is that the proposed technique considers strong mutual coupling between closely-positioned Tx/Rx arrays, and the S-parameter variation due to the presence of each other's array. This technique has two stages; first, 180-degree hybrid couplers are connected to both Tx/Rx ports of a plane-symmetrical MIMO system. This decouples both Tx/Rx ports, and moreover, channels between them are orthogonalized. That is, the MIMO system is transformed into multi orthogonalized single-input single-output (SISO) systems. Second, Tx/Rx ports of each orthogonalized SISO system are simultaneously matched based on conjugate matching theory. Consequently, the transmission power of the short-range MIMO system is maximized. Numerical results show that the proposed technique realizes higher channel capacity than the conventional DMN; indeed it achieves the theoretically possible capacity. In addition to theoretical analyses, we provide an example for microstrip line (MSL) circuit implementation. This MSL model offers good simultaneous decoupling and matching performance yielding channel capacity comparable to that of an ideally-designed circuit model. This validates the implementation feasibility of the proposed technique.},
keywords={},
doi={10.1587/transcom.2015EBP3463},
ISSN={1745-1345},
month={August},}

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TY - JOUR
TI - Simultaneous Decoupling and Matching Technique for Short-Range MIMO
T2 - IEICE TRANSACTIONS on Communications
SP - 1846
EP - 1858
AU - Kentaro MURATA
AU - Naoki HONMA
AU - Kentaro NISHIMORI
AU - Naobumi MICHISHITA
AU - Hisashi MORISHITA
PY - 2016
DO - 10.1587/transcom.2015EBP3463
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E99-B
IS - 8
JA - IEICE TRANSACTIONS on Communications
Y1 - August 2016
AB - This paper presents a novel simultaneous decoupling and matching technique for transmitting (Tx) and receiving (Rx) ports in short-range multiple-input multiple-output (SR-MIMO) systems. The principal difference with conventional decoupling and matching network (DMN) approaches is that the proposed technique considers strong mutual coupling between closely-positioned Tx/Rx arrays, and the S-parameter variation due to the presence of each other's array. This technique has two stages; first, 180-degree hybrid couplers are connected to both Tx/Rx ports of a plane-symmetrical MIMO system. This decouples both Tx/Rx ports, and moreover, channels between them are orthogonalized. That is, the MIMO system is transformed into multi orthogonalized single-input single-output (SISO) systems. Second, Tx/Rx ports of each orthogonalized SISO system are simultaneously matched based on conjugate matching theory. Consequently, the transmission power of the short-range MIMO system is maximized. Numerical results show that the proposed technique realizes higher channel capacity than the conventional DMN; indeed it achieves the theoretically possible capacity. In addition to theoretical analyses, we provide an example for microstrip line (MSL) circuit implementation. This MSL model offers good simultaneous decoupling and matching performance yielding channel capacity comparable to that of an ideally-designed circuit model. This validates the implementation feasibility of the proposed technique.
ER -