Power Boosting and Compensation During OTA Testing of a Real 4G LTE Base Station in Reverberation Chamber

Micheli, Davide; Barazzetta, Massimo; Moglie, Franco; Primiani, Valter Mariani

doi:10.1109/temc.2015.2434277

Cited by 47 publications

(16 citation statements)

References 31 publications

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“…Since multipath fading has primarily effect onto symbol decoding [21], there must be a recognizable relation between fading and RAN performance indicators which directly depend on symbol decoding. In a cellular system, the block error rate (BLER) is the lowest level indicator which comes from symbol decoding [22]. The BLER is the error rate in decoding MAC radio blocks, and it says how difficult the symbol decoding is: the more corrupt (delayed, distorted in phase, amplitude and frequency) the symbol constellation is, the more difficult the decision [23] [24].…”

Section: Resultsmentioning

confidence: 99%

Multipath and Doppler Characterization of an Electromagnetic Environment by Massive MDT Measurements From 3G and 4G Mobile Terminals

et al. 2019

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This paper describes an innovative approach to radio channel characterization in UMTS and LTE mobile networks. In place of traditional drive tests (DT), which employ a single test mobile, a massive collection of georeferenced radio measurements is made from a wide population of user equipment (UE). This is possible with new 3GPP features, called ''minimization of DTs'' (MDT), which are implemented in the last generation UEs and enable the reporting of additional periodical measurements, including GPS position and estimated UE distance (i.e. delay) over the radio path. This opens to new fields of investigation in the mobile radio channel, unreachable with the legacy DT approach, such as multipath and Doppler analysis. The UE MDT data of UMTS and LTE RAN of Telecom Italia Mobile, in the Italian midsized city of Bologna, have been statistically analyzed. The big data elaboration has been performed with the Nokia proprietary system ''GeoSynthesis.'' The results give a high-resolution geographical view of the abovementioned channel phenomena affecting the quality and user experience. They are in good accordance with network performance indicators: the higher the multipath time, the worse the decoding performance of radio blocks (block error rate). The estimated Doppler shift also fits the known mobility patterns in the urban environment.

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Section: Resultsmentioning

confidence: 99%

Multipath and Doppler Characterization of an Electromagnetic Environment by Massive MDT Measurements From 3G and 4G Mobile Terminals

et al. 2019

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“…The use of the reverberation chamber set-up is well-known and mostly adopted in electromagnetic compatibility and electromagnetic interference analysis of electronic or wireless systems [ 48 , 49 , 50 , 51 , 52 , 53 ]. Due to the particular electromagnetic environment, RC systems are frequently adopted to evaluate the EM absorbing capability provided by materials and structures [ 54 , 55 ].…”

Section: Methodsmentioning

confidence: 99%

Advanced Radar Absorbing Ceramic-Based Materials for Multifunctional Applications in Space Environment

et al. 2018

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In this review, some results of the experimental activity carried out by the authors on advanced composite materials for space applications are reported. Composites are widely employed in the aerospace industry thanks to their lightweight and advanced thermo-mechanical and electrical properties. A critical issue to tackle using engineered materials for space activities is providing two or more specific functionalities by means of single items/components. In this scenario, carbon-based composites are believed to be ideal candidates for the forthcoming development of aerospace research and space missions, since a widespread variety of multi-functional structures are allowed by employing these materials. The research results described here suggest that hybrid ceramic/polymeric structures could be employed as spacecraft-specific subsystems in order to ensure extreme temperature withstanding and electromagnetic shielding behavior simultaneously. The morphological and thermo-mechanical analysis of carbon/carbon (C/C) three-dimensional (3D) shell prototypes is reported; then, the microwave characterization of multilayered carbon-filled micro-/nano-composite panels is described. Finally, the possibility of combining the C/C bulk with a carbon-reinforced skin in a synergic arrangement is discussed, with the aid of numerical and experimental analyses.

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“…The measurement uncertainties for total radiated power (TRP) and total isotropic sensitivity (TIS) were analyzed in [9]- [11]. The long-term evolution (LTE) base station has been measured in the RC ， and the test results were reported in [12]- [14]. However, all the above studies focused on frequency bands below 6 GHz.…”

Section: Introductionmentioning

confidence: 99%

A Novel Mode-Stirred Reverberation Chamber Design for 5G Millimeter Wave Bands

et al. 2021

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A novel mode-stirred reverberation chamber (RC) is designed and analyzed for millimeter wave bands. The size of the proposed RC with dimensions of 0.9 m◊0.9 m◊1.1 m is suitable for user equipment (UE) tests. Two Zshaped mode-stirrers are applied to generate a uniform field. To fulfill the communication and test requirements for user equipment, reference, measurement and link antennas with a large bandwidth are utilized, which can support both the frequency range (FR) 1 and FR2 bands of the 5G spectrum. The lowest usable frequency (LUF) and mode density were first calculated and examined. Then, the power transfer function (PTF) from 2 GHz to 40 GHz was obtained to verify the path loss. Three measurement campaigns were carried out to verify the accuracy of the RC. Firstly, the transmission power of the passive antenna for a conductive test was compared with the RC over the air (OTA) total radiated power (TRP) for single-tone signals. Then, signals with bandwidths of 100 MHz and 400 MHz were applied. A maximum power difference of only 0.8 dB was found in the above two experiments. Furthermore, the TRP for the same commercial 5G UE in both RC and compact antenna test range (CATR) systems was measured and compared. To the best of the authors' knowledge, this is the first work to provide TRP results for 5G millimeter wave bands in a RC. The test results show that the TRP values for the two systems are almost the same with a maximum deviation of 0.5 dB, while the time required to carry out tests using the RC is lower than that for the CATR system. INDEX TERMS reverberation chamber, millimeter wave, OTA, TRP.

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Power Boosting and Compensation During OTA Testing of a Real 4G LTE Base Station in Reverberation Chamber

Cited by 47 publications

References 31 publications

Multipath and Doppler Characterization of an Electromagnetic Environment by Massive MDT Measurements From 3G and 4G Mobile Terminals

Multipath and Doppler Characterization of an Electromagnetic Environment by Massive MDT Measurements From 3G and 4G Mobile Terminals

Advanced Radar Absorbing Ceramic-Based Materials for Multifunctional Applications in Space Environment

A Novel Mode-Stirred Reverberation Chamber Design for 5G Millimeter Wave Bands

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