Multi-Antenna Information Theory

Geyi, Wen

doi:10.2528/pier07052203

Cited by 26 publications

(8 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Indeed, we show below that when space-time field interactions are treated in full using exact Green's function method, no effective such impulse response can be defined in general, though some approximations often work. 1 The complexity of the electromagnetic problem stems from the fact that when space and time are treated together in electromagnetic field interactions, certain additional constraints evinced by the structure of Maxwell's equations will force any LTI system representation of the antenna problem to have a special form. As has been shown recently, although the ACGF appears at first sight to play the role of the 'spatial impulse response' of the antenna, this ACGF-the fundamental tool deployed for the analysis conducted in this paper-is not spatially shift-invariant.…”

Section: Introductionmentioning

confidence: 99%

“…There is an interest nowadays in arriving at a general formulation of wireless communications systems with both electromagnetics and signal processing aspects [1][2][3][4][5][6][7]. For example, some recent book-length treatments of such interdisciplinary topic appear to address issues pertinent to a unified electromagnetic/communicationtheoretic formalism [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…R. Soc. A 475: 20180699 treated in parallel [1][2][3][4][5][6][7]. For example, some recent book-length treatments of such interdisciplinary topic appear to address issues pertinent to a unified electromagnetic/communicationtheoretic formalism [5][6][7].…”

mentioning

confidence: 99%

See 2 more Smart Citations

The antenna spacetime system theory of wireless communications

Mikki

2019

Proc. R. Soc. A.

View full text Add to dashboard Cite

A general deterministic spacetime system theory of antennas suitable for the analysis and design of wireless communication links is rigorously developed using the recently introduced antenna current Green's function formalism. We provide the first complete derivation of the antenna spatio-temporal response to a delta source using only electromagnetic Green's functions, effectively eliminating all field and current distributions in the final expressions. While the theory works well in both space and time, it puts into sharper focus how the spatio-temporal structure of electromagnetic processes imposes restrictions on the signal processing capabilities of antenna systems by constraining the allowable mathematical form of the effective impulse response of the global wireless communication link. It is shown that the antenna current Green's functions of both the receive and transmit terminals, plus the propagation environment Green's functions, are the only quantities needed to obtain the single input-single output link response function in closed form. One of the results deduced from the theory is that an exact impulse response cannot be ascribed to an arbitrary antenna in general, but may be approximated for many applications. The theory can be deployed for future antenna systems research to boost up spectral efficiency (without increasing physical bandwidth) by directly incorporating electromagnetic knowledge into the design of the communication system's signal processing functions.royalsocietypublishing.org/journal/rspa Proc. R. Soc. A 475: 20180699 treated in parallel [1][2][3][4][5][6][7]. For example, some recent book-length treatments of such interdisciplinary topic appear to address issues pertinent to a unified electromagnetic/communicationtheoretic formalism [5][6][7]. Several research articles have also been published in this domain, e.g. see [2,3] (a non-exhaustive list; however, see [5] for an extensive literature on electromagnetic information theory). Owing to the increasing complexity of 5G and other future communication systems, it is no longer possible to separate the study of the physical layer to purely signal processing and purely electromagnetic parts. Indeed, each process is now expected to feed on the other, and for that reason, there is a need to reexamine the subject at the broadest and most comprehensive theoretical level possible, especially in light of some recent advances in fundamental research. As a step toward this goal, the antenna current Green's function (ACGF) [7] was recently introduced as a frequency-domain spatial transfer function method capable of providing an alternative approach to applied electromagnetics more in line with signal processing and communication theory [8,9]. The ACGF formalism is a complete exact electromagnetic generalization of the idea of the 'impulse response' of antenna systems. It was formulated recently in [7-25] using a hybrid approach incorporating functional analysis, distribution theory, differential geometry into electromagnetic theory. Although t...

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The antenna spacetime system theory of wireless communications

Mikki

2019

Proc. R. Soc. A.

View full text Add to dashboard Cite

show abstract

“…Demand for the increased data capacity of wireless communication systems drives the development of MIMO systems [1][2][3]. In order to achieve the desired performance of a MIMO system, the reduction of mutual coupling among the closely-placed antenna elements is necessary.…”

Section: Introductionmentioning

confidence: 99%

Tri-Band Four-Element Mimo Antenna With High Isolation

Li¹,

Chu²,

Guo³

2011

PIER C

View full text Add to dashboard Cite

A tri-band four-element MIMO (multiple-input-multipleoutput) antenna with high isolation is presented. The MIMO antenna consists of four symmetrical antenna elements. To relieve the degradation of the operation bandwidth caused by the strong mutual coupling among the four antenna elements, four symmetrical rectangles are removed from the four corners of the ground plane, respectively. The effect of the cutting of the four rectangles on the isolation is slight. Two kinds of isolation structure are applied to reduce the mutual coupling among the elements. The first kind of isolation consists of two slits and a protruded ground branch, and the second kind of isolation structure consists of four symmetrical slits etched into the ground plane. The mutual coupling caused by surface currents is reduced by slits, the mutual coupling resulted from near-field is suppressed by the ground branches, and thus high isolation for the MIMO antenna is achieved. Moreover, the effects of the slits and the ground branches on the operation bandwidth are slight, thus the operation bandwidth and the mutual coupling can be controlled independently, to some degree. A tri-band operation bandwidth (2.34-2.95 GHz, 3.38-3.75 GHz, and 4.4-6.7 GHz) with VSWR ≤ 2 and isolation ≥ 20 dB, is achieved. The results, including S-parameters, radiation patterns, mean effective gain (MEG), radiation efficiency and signal correlations, indicate that the proposed MIMO antenna can provide spatial or pattern diversity to increase data capacity of wireless communication systems.

show abstract

“…To guarantee a high throughput for better experience, the multiple-input multiple-output (MIMO) technology has been adopted in the IEEE 802.11 standard [1,2]. The MIMO technology employs multiple antennas on the transmitter and receiver to improve the communication quality and increase the system capacity without using additional spectrum and power [3][4][5][6]. To achieve a good performance of the MIMO system, the mutual couplings between the multiple antennas should be low.…”

Section: Introductionmentioning

confidence: 99%

A Quad-Antenna System Operating at the 2.4/5.2/5.8 GHZ Wlan Bands for Laptop Computers

Guo¹,

Wang²,

Du³

et al. 2014

PIER C

View full text Add to dashboard Cite

Abstract-In this paper, a quad-antenna system for laptop computers is studied. Because two dualantenna systems can construct a quad-antenna system, the dual-antenna systems in the open literature are utilized. The mutual coupling between the two dual-antenna systems is analyzed and reduced. To validate the design of a quad-antenna system, the quad-antenna system, consisting of two dualantenna systems proposed in the open literature and a decoupling element, is fabricated and tested. Its measured −10 dB impedance bandwidths are 200 MHz (2.33-2.52 GHz) and 1.62 GHz (4.5-6.12 GHz). The measured mutual couplings are below −15.5/−19 dB at the 2.4-and 5.2/5.8-GHz WLAN bands, respectively. The measured gains are better than 2.4/3.9 dBi with efficiencies higher than 70%/72% at the two bands, respectively. The envelop correlation coefficient is evaluated based on the measured results.

show abstract

Multi-Antenna Information Theory

Cited by 26 publications

References 32 publications

The antenna spacetime system theory of wireless communications

The antenna spacetime system theory of wireless communications

Tri-Band Four-Element Mimo Antenna With High Isolation

A Quad-Antenna System Operating at the 2.4/5.2/5.8 GHZ Wlan Bands for Laptop Computers

Contact Info

Product

Resources

About