Spherical-wave model for short-range MIMO

Jiang, Jeng-Shiann; Ingram, M.A.

doi:10.1109/tcomm.2005.852842

Cited by 169 publications

(42 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, an infinitely large spacing yields two independent streams but does not always provide the best MIMO performance in an SR-MIMO system in terms of SNR. SR-MIMO has an optimal antenna spacing realizing maximum channel capacity, and optimal Tx-Rx array configurations were theoretically discussed in previous studies [7]- [10]. For practical purposes, the antenna spacing of an SR-MIMO array should be chosen considering a balance between desired communication properties and design size limitation.…”

Section: Channel Capacity Characteristicsmentioning

confidence: 99%

“…Considering this point, optimal array designs for LOS MIMO that provide uncorrelated channels were investigated based on plane and spherical wave theories. For instance in [7]- [10], MIMO array antenna spacing is regarded as a key factor to realize uncorrelated channels when Tx-Rx distance is fixed. It was proven that a full-rank channel matrix can be realized by arranging MIMO array antenna elements at optimal spacing intervals.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Four-Stream Parallel Transmission for Short-Range MIMO Using Only Passive Analog Components

Murata

Honma

Nishimori

et al. 2016

IEICE Trans. Commun.

View full text Add to dashboard Cite

An analog-beamforming-based eigenmode transmission technique is proposed that employs a network of interconnected 180degree hybrid couplers at both transmitting and receiving sides of a planesymmetrically configured short-range MIMO system. This technique can orthogonalize MIMO channels regardless of array parameters such as antenna spacing and Tx-Rx distance, provided the MIMO array is symmetric. For verifying the effectiveness of the proposed technique in channel orthogonalization, an experiment is conducted using a 4×4 MIMO array consisting of microstrip antennas and cascade-connected rat-race hybrid couplers. The results indicate a reduction in interference by approximately −28.3 dB on average compared to desired signal power, and the ability to realize fourstream parallel MIMO transmission by using only analog passive networks. The proposed technique can achieve channel capacity almost equivalent to that of eigenbeam space division multiplexing with ideal digital beamforming.

show abstract

Section: Channel Capacity Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Four-Stream Parallel Transmission for Short-Range MIMO Using Only Passive Analog Components

Murata

Honma

Nishimori

et al. 2016

IEICE Trans. Commun.

View full text Add to dashboard Cite

show abstract

“…In order to deal with Gbit/s-order large-volume data sets such as movies and images, ultra wide band (UWB) and millimeter-wave technologies are used that can increase the transmission capacity per unit of time [1]. A different approach to enhancing frequency utilization efficiency is short-range multiple-input multipleoutput (SR-MIMO) communication [2]- [4].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Decoupling and Matching Technique for Short-Range MIMO

Murata

Honma

Nishimori

et al. 2016

IEICE Trans. Commun.

View full text Add to dashboard Cite

This paper presents a novel simultaneous decoupling and matching technique for transmitting (Tx) and receiving (Rx) ports in shortrange 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 singleoutput (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.

show abstract

“…Also, with the rapid spread of compact terminal including smartphone, high speed data transmission in short range is required. A short range MIMO (Multiple-Input Multiple-Output) [1,2] has been proposed for extending the data-rate of the short range wireless communication, where the channel capacity is enhanced by increasing the number of antennas at the transmitting and receiving antenna. When the distance between the transmitting and receiving array antennas is sufficiently short, the channel has low spatial correlation characteristics even with line-of-sight (LOS) situation.…”

Section: Introductionmentioning

confidence: 99%

Design of matching networks based on image impedances for near field MIMO

2015

View full text Add to dashboard Cite

This paper proposes matching method based on image impedances for near field MIMO. In this letter, matching method, which can realize matching of all port at the same time by extending image impedances theory, is proposed. Numerical analysis and experimental results demonstrate the proposed matching method is effective in enhancing the channel capacity of the near field MIMO, where facing antennas strongly couple to each other.

show abstract

Spherical-wave model for short-range MIMO

Cited by 169 publications

References 16 publications

Four-Stream Parallel Transmission for Short-Range MIMO Using Only Passive Analog Components

Four-Stream Parallel Transmission for Short-Range MIMO Using Only Passive Analog Components

Simultaneous Decoupling and Matching Technique for Short-Range MIMO

Design of matching networks based on image impedances for near field MIMO

Contact Info

Product

Resources

About