MIMO channel measurements for urban military applications

Hampton, Jerry R.; Cruz, Marcos Antônio; Merheb, N.M.; Hammons, A.R.; Paunil, D.E.; Ouyang, Feng

doi:10.1109/milcom.2008.4753526

Cited by 8 publications

(5 citation statements)

References 7 publications

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“…This implies that MIMO antennas can be placed as close as a quarter of wavelength apart without much degradation to the capacity gain. Note that a similar finding was reported in [10] for urban environments. In addition, the figure shows that large antenna separations are not needed to obtain performance gains of MIMO over SISO for environments with sufficient scattering.…”

Section: ) Wide-road Scenariosupporting

confidence: 87%

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Measurements of Multiple-Input Multiple-Output (MIMO) performance under army operational conditions

Lai¹,

Zannetti²,

Chin³

et al. 2010

2010 - Milcom 2010 Military Communications Conference

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This paper presents the results from a field measurement campaign that was conducted to provide an understanding of Multiple-Input Multiple-Output (MIMO) performance relative to that of a Single-Input Single-Output (SISO) system in military-type environments. The Space & Terrestrial Communications Directorate (STCD) MIMO system was used to conduct these experiments. The system has two antennas and operates at transmit frequencies of 430 and 1380MHz, which fall within military frequency bands. A variety of operational environments with many scenarios were considered. The experiments were conducted at C4ISR OTM testing facility, Fort Dix, New Jersey for transmissions along a wide road, a narrow road and through heavy foliage. These experiments measured the throughput gain of MIMO over SISO given the same transmit power and channel usage. The gain in throughput was corroborated by information-theoretic capacity calculations using channel estimates collected during the experimental campaign. In addition, the impact of the antenna spacing on throughput gain was also studied. Depending on the multipath-richness of the environment, the experimental results show that the 2-antenna system provides a throughput of 1.3 to 2.0 times that of a SISO system. On average, a range extension of 1.5 times could be realized for all the considered scenarios and transmit frequencies. The results suggest that antennas in MIMO systems should be placed at least a half of carrier wavelength apart, as indicated in open literature.

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Section: ) Wide-road Scenariosupporting

confidence: 87%

“…It is well-known in literature that antennas in MIMO systems should be separated by a half of wavelength. However, several previous works show that antenna separation can be smaller [10], [12]. The experiments with the STCD MIMO system showed possible throughput gains for antenna separations of a quarter of wavelength.…”

Section: Discussionmentioning

confidence: 94%

Measurements of Multiple-Input Multiple-Output (MIMO) performance under army operational conditions

Lai¹,

Zannetti²,

Chin³

et al. 2010

2010 - Milcom 2010 Military Communications Conference

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show abstract

“…MIMO communication systems were studied for more than one decade and proved theoretically that they improve capacity, reliability, coverage, or combinations in comparison with different systems that have a mono antenna at the transmitter, the receiver or both of them [6] [7]. MIMO also has different advantages, such as beam forming gain, spatial diversity, and multiplexing.…”

Section: Mimo Systemmentioning

confidence: 99%

Bit Error Rate (BER) Performance of MIMO Systems in M QAM with Nonlinear Effect

Zakzouk¹,

Elbakar²,

Yousef³

2019

IJEAT

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Out object in this paper it to study, the effect of nonlinearity on the bit error rate (BER) of MIMO systems in M-QAM modulation techniques. We consider Saleh’s model (power amplifier model) for the nonlinearity, and apply the nonlinear model on MIMO system with receiver diversity and transmitter diversity. For transmitter diversity, the Space-Time Block Coding (STBC) based on Alamouti scheme is used to provide transmits diversity for two transmitting antennas. The results show that, if there is a high variation in the amplitude of the M- QAM symbols, there will behigh effect of nonlinearity that causes high BER especially for high amplitude symbols at high SNR.

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“…Shannon's formula computes an instantaneous capacity for a single-input-single-output (SISO) channel in the transmitter and receiver units that uses the number of antennas at each end of the link [1]. The ergodic SISO capacity (in dB-b/s/Hz) as a function of distance is less than the multiple-input multiple-output (MIMO) capacities for line-of-sight geometry.…”

Section: Introductionmentioning

confidence: 99%

Diversity characteristics of four‐element ring slot‐based MIMO antenna for sub‐6‐GHz applications

2023

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This paper proposes four‐ring slot resonator‐based MIMO antennas of 75 × 150 mm2 without and with CSRR structures in the sub‐6‐GHz range. These orthogonal‐fed antennas have shown diverse characteristics with dual polarization. L‐shaped parasitic structures have increased the isolation (i.e., >40 dB) in the single‐element antenna over the band of 3.4 GHz–3.8 GHz. A set of three CSRR structures in the MIMO antenna reduced the coupling between antenna ports placed in an inline arrangement and enhanced the isolation from 12 dB to 20 dB and the diversity characteristics. The S‐parameters of both MIMO antennas are measured and used to evaluate MIMO parameters like ECC, TARC, MEG, and channel capacity loss. The simulation results show the variations in the gain and directivity on exciting linear and dual polarizations. The diversity performance of the reported MIMO antennas is suitable for 5G applications.

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MIMO channel measurements for urban military applications

Cited by 8 publications

References 7 publications

Measurements of Multiple-Input Multiple-Output (MIMO) performance under army operational conditions

Measurements of Multiple-Input Multiple-Output (MIMO) performance under army operational conditions

Bit Error Rate (BER) Performance of MIMO Systems in M QAM with Nonlinear Effect

Diversity characteristics of four‐element ring slot‐based MIMO antenna for sub‐6‐GHz applications

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