Diversity Limits of Compact Broadband Multi-Antenna Systems

Taluja, Pawandeep S.; Hughes, B.L.

doi:10.1109/jsac.2013.130219

Cited by 31 publications

(22 citation statements)

References 25 publications

(40 reference statements)

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“…In order to mitigate the effects of mutual coupling, sophisticated radiofrequency matching techniques have to be employed between the AA and the radio-frequency chain. In [81], the optimal matching network is designed for circular arrays, which substantially improves attainable system capacity.…”

Section: ) Non-ideal Hardwarementioning

confidence: 99%

“…Hence, diverse counter-measures have been conceived for mitigating pilot contamination [71]- [79], such as specially conceived pilot design [71], power allocation [75] and pilot-decontamination precoding [78]. Finally, the performance of practical LS-MIMO systems is affected by numerous non-ideal factors [78]- [83], including imperfect CSI [78], [80] and non-ideal hardware [81]- [83]. As one of major research issues, the design of non-coherent blind detection or semi-blind assisted LS-MIMO systems has to be explored, which is capable of dispensing much less channel estimation information.…”

Section: Summary Of Physical Layer Issuesmentioning

confidence: 99%

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Survey of Large-Scale MIMO Systems

Zheng

Zhao

Mei

et al. 2015

IEEE Commun. Surv. Tutorials

282

172

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Abstract-The escalating teletraffic growth imposed by the proliferation of smartphones and tablet computers outstrips the capacity increase of wireless communications networks. Furthermore, it results in substantially increased carbon dioxide emissions. As a powerful countermeasure, in the case of full-rank channel matrices, MIMO techniques are potentially capable of linearly increasing the capacity or decreasing the transmit power upon commensurately increasing the number of antennas. Hence, the recent concept of large-scale MIMO (LS-MIMO) systems has attracted substantial research attention and been regarded as a promising technique for next-generation wireless communications networks. Therefore, this paper surveys the state of the art of LS-MIMO systems. First, we discuss the measurement and modeling of LS-MIMO channels. Then, some typical application scenarios are classified and analyzed. Key techniques of both the physical and network layers are also detailed. Finally, we conclude with a range of challenges and future research topics.Index Terms-Large-scale MIMO, 3-D MIMO, channel modeling, physical layer, networking.

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Section: ) Non-ideal Hardwarementioning

confidence: 99%

Section: Summary Of Physical Layer Issuesmentioning

confidence: 99%

Survey of Large-Scale MIMO Systems

Zheng

Zhao

Mei

et al. 2015

IEEE Commun. Surv. Tutorials

282

172

View full text Add to dashboard Cite

show abstract

“…As noted in [17], for n R = 2 receive antennas, the impedance matrix of parallel dipoles can always be simultaneously diagonalized at all frequencies by a discrete Fourier transform or Butler network. Several authors have shown that Butler networks can be realized quite accurately over wide bandwidths ([14] and references therein).…”

Section: Lower Bounds On Ergodic Capacitymentioning

confidence: 99%

The impact of frequency-selective matching on the capacity of compact MIMO systems

Kundu

Hughes

2014

2014 IEEE International Conference on Communications (ICC)

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Mutual coupling among receive antennas can profoundly reduce the ergodic capacity of MIMO systems. Prior work has shown that these losses can often be mitigated by using multi-port antenna matching at the receiver; however, previous studies have focused exclusively on frequency-nonselective matching and rely on assumptions which are valid only for small bandwidths. In this paper, we revisit the ergodic capacity of a MIMO system with coupled receive antennas for a nonnegligible bandwidth. In particular, we present upper and lower bounds on the best possible MIMO capacity that can be achieved by physically-realizable, frequency-selective (FS) multi-port and single-port matching networks. These results suggest that FS matching can significantly increase capacity in the presence of strong coupling, for both single-port and multi-port scenarios. Moreover, we show that these gains can be achieved for a 2 × 2 MIMO system by a simple class of matching networks that are easily realized in hardware.

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“…With the help of simulations, it is shown that if the two‐dimensional antenna array is used instead of linear array, improvement in the coverage and data rate could be achieved. It is explained that how impedance matching network incorporated in massive MIMO would decrease the original bandwidth of antenna. The effect of antenna polarization is studied and found the bottleneck in maximum achievable capacity.…”

Section: Introductionmentioning

confidence: 99%

Golden angle‐inspired design of massive MIMO tapered slot array with less correlation for 5G lower band applications

Reddy

Murugan

Kumar

2019

Int J RF Microw Comput Aided Eng

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In this article, for the first time, we come up with a nature‐inspired MIMO antenna configuration that could provide less correlated wireless channels for 5G lower band (3000‐4200 MHz). Essentially, the cross‐correlation among the antenna elements is reduced by incorporating the concept of golden angle into a cylindrical configuration of tapered slot antenna array. The golden angle helps in arranging the end‐fire radiating tapered slot antennas (TSAs) in such a way that there will not be any spatial overlap among the radiation fields of the individual antenna elements. The idea is validated with 24 TSA elements placed in a cylindrical fashion. The envelope correlation coefficient (ECC) is calculated from the simulations in ANSYS HFSS and verified with measurements. The ECC value is found to be less than 0.01 in the range of 3 GHz to 4.25 GHz. The impedance matching and mutual coupling between the elements are found to be very good in the above‐mentioned frequency range from the simulations and measurements. It is believed that the application of golden angle concept to MIMO antennas would open up the windows for implementation of dense massive MIMO.

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Diversity Limits of Compact Broadband Multi-Antenna Systems

Cited by 31 publications

References 25 publications

Survey of Large-Scale MIMO Systems

Survey of Large-Scale MIMO Systems

The impact of frequency-selective matching on the capacity of compact MIMO systems

Golden angle‐inspired design of massive MIMO tapered slot array with less correlation for 5G lower band applications

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