Channel models for capacity evaluation of MIMO handsets in data mode

Nielsen, Jesper Ødum; Yanakiev, Boyan; Barrio, Samantha Caporal Del; Pedersen, Gert Frølund

doi:10.1049/iet-map.2015.0769

Cited by 2 publications

(3 citation statements)

References 34 publications

(56 reference statements)

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“…Using (7), the denominator of (9) (12) where  is the angular frequency, 0  the free space magnetic permeability and k the wave number. Thus, by combining (9), (11) and (12) …”

Section: B Proposed Methodologymentioning

confidence: 99%

“…Vasilis Papamichael and Petros Karadimas, Member IEEE Although the focus of this paper is on diversity performance of MPA systems, the proposed electromagnetic methodology can be advantageous to other research fields requiring covariance matrix estimations, such as MIMO capacity calculations [11]- [13] and antenna systems for direction of arrival (DOA) estimation [14], [15]. In both fields, the covariance matrix was not determined via the rigorous applicability of the reciprocity principle of MPA systems [8].…”

Section: On the Covariance Matrix And Diversity Performance Evaluatiomentioning

confidence: 99%

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On the Covariance Matrix and Diversity Performance Evaluation of Compact Multiport Antenna Systems

Papamichael¹,

Karadimas

2017

IEEE Trans. Antennas Propagat.

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Abstract-In this paper, we present a new electromagnetic methodology that determines the covariance matrix of compact multi-port antenna (MPA) systems at the early design stage. Further insight to this field is provided, as contrary to existing methodologies, it rigorously relies on the reciprocity principle of MPA systems. Thus, the impact of propagation environment, termination conditions and MPA radiation characteristics as independent factors affecting performance is physically incorporated. Provided the availability of mathematical expressions for the cumulative distribution function (CDF) and probability density function (PDF) of received signal-to-noise ratio (SNR), performance can be then analytically studied via the diversity antenna gain (DAG) in terms of a) SNR enhancement at a specific outage probability (OP) level (that is DAG-OP) and b) average SNR reduction for achieving a specific average bit error rate (BER) (that is DAG-BER). Illustrative examples with performance evaluation of compact MPA systems are presented. The adopted diversity technique is the transmit antenna selection/maximal ratio combining (TAS/MRC), which for the first time is analytically studied employing realistic MPA systems. Comparisons with existing published results further demonstrate the validity and usefulness of the proposed methodology.Index Terms-Antenna diversity, Covariance matrix methodology, Diversity antenna gain, Multi-port antenna systems.

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“…Using (7), the denominator of (9) (12) where  is the angular frequency, 0  the free space magnetic permeability and k the wave number. Thus, by combining (9), (11) and (12) …”

Section: B Proposed Methodologymentioning

confidence: 99%

Section: On the Covariance Matrix And Diversity Performance Evaluatiomentioning

confidence: 99%

On the Covariance Matrix and Diversity Performance Evaluation of Compact Multiport Antenna Systems

Papamichael¹,

Karadimas

2017

IEEE Trans. Antennas Propagat.

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“…However, the performance of multiple-input-multiple-output (MIMO) antennas depends on the propagation environment as well as the design of antenna elements (AEs) and their positions on the chassis [4,5]. AEs of MIMO antenna should be low correlated and highly efficient; therefore, optimizing MIMO AEs in terms of design and location on the chassis is an essential issue to improve performance [6,7]. Moreover, the performance of MIMO antennas of mobile terminal is limited by the effect of user's body (hands and head) when the device is used in data or talk modes [8].…”

Section: Introductionmentioning

confidence: 99%

A Study of Antenna Elements Configuration and User's Hand Effects on a Four-Element Dual-Band Sub-6 GHZ Mimo Antenna

Elshirkasi¹,

Al‐Hadi²,

Mansor³

et al. 2019

PIER C

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This paper evaluates the performance of different configurations of MIMO antenna operating in the 5G band with the effect of user's hand in data mode and suggests an optimized configuration to mitigate hand effects. A dual-band four-element MIMO antenna is used. All antenna elements (AEs) are identical planar inverted-F antenna (PIFAs) with a lower frequency band (LB) from 3.3 to 3.8 GHz and an upper frequency band (UB) from 5.2 to 6 GHz. In addition, four different configurations to place the AEs on the chassis are selected including worst and optimized configurations as well two intermediate cases. Results show that similar values of ECC are produced for both cases without and with user hand. These values are less than 0.20 on most frequency range, except the worst case configuration which has some high ECC values close to unity. Unlike ECC, TE is severely affected by user's hand as well as by the different configuration. TE of each AE under hand effect is degraded differently according to the thickness of hand tissue that covers it. TE in the optimized configuration without user's hand ranges between 50 and 95% in both frequency bands. However, this range deteriorates when user's hand effect is considered, between 40% and 15% in LB, and from 35% to 41% in the UB. Multiplexing efficiency analysis reveals that MIMO performance is mainly determined by TE, and the impact of the low ECC is insignificant. This indicates that improving the performance depends on improving the TE of AEs and optimizing their positions on the chassis to reduce interaction with user's hand. Moreover, the loss in ergodic capacity due to user's hand compared with free space is increased from 5 to 40% in the LB, and it is more stable in the UB and ranging between 12 and 17%.

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Channel models for capacity evaluation of MIMO handsets in data mode

Cited by 2 publications

References 34 publications

On the Covariance Matrix and Diversity Performance Evaluation of Compact Multiport Antenna Systems

On the Covariance Matrix and Diversity Performance Evaluation of Compact Multiport Antenna Systems

A Study of Antenna Elements Configuration and User's Hand Effects on a Four-Element Dual-Band Sub-6 GHZ Mimo Antenna

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