scholarly journals On the Relationship between Field Amplitude Distribution, Its Maxima Distribution, and Field Uniformity inside a Mode-Stirred Reverberation Chamber

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
M. A. García-Fernández ◽  
C. Decroze ◽  
D. Carsenat ◽  
N. Arsalane ◽  
G. Andrieu
Keyword(s):  
Communication Systems ◽  
Amplitude Distribution ◽  
Calibration Method ◽  
Field Amplitude ◽  
Wireless Communication Systems ◽  
Reverberation Chamber ◽  
Working Volume ◽  
Field Uniformity ◽  
The Relationship ◽  
Statistical Laws

A mode-stirred reverberation chamber (RC) is nowadays a commonly accepted performing tool for over-the-air (OTA) communication system evaluation, and their standardization is underway. Before performing active measurements of wireless communication systems using an RC, field uniformity inside the RC working volume has to be measured following the calibration method described in IEC standards 61000-4-21 and 61000-4-3, which requires 24 calibration measurements of field amplitude. In this contribution, we present the statistical laws that describe electromagnetic field maxima distribution, and based on them, a novel expression that could be useful to obtain a lower limit for the number of stirrer positions required at least to obtain a specific value for the normalized dispersion used to evaluate field uniformity with the IEC calibration method, being therefore of particular interest for OTA measurements.

scholarly journals A low complexity digital frequency calibration with high jitter immunity for ultra-low-power oscillators

2019 ◽  
Vol 17 ◽  
pp. 145-150
Author(s):  
Markus Scholl ◽  
Ralf Wunderlich ◽  
Stefan Heinen
Keyword(s):  
Low Power ◽  
Communication Systems ◽  
Calibration Method ◽  
Low Complexity ◽  
Frequency Stability ◽  
Wireless Communication Systems ◽  
Ultra Low Power ◽  
Wireless Transceiver ◽  
Digital Frequency ◽  
Frequency Calibration

Abstract. This paper presents a highly efficient digital frequency calibration method for ultra-low-power oscillators in wireless communication systems. This calibration method locks the ultra-low-power oscillator's output frequency to the reference clock of the wireless transceiver during its send- and receive-state to achieve frequency stability over process variation and temperature drifts. The introduced calibration scheme offers high jitter immunity and short locking periods overcoming frequency calibration errors for typical ultra-low-power oscillator's by utilizing non-linear segmented feedback levels. In measurements the proposed calibration method improves the frequency stability of an ultra-low-power 32 kHz oscillator from 53 to 10 ppm ∘C−1 over a wide temperature range for temperature drifts of less than 1 ∘C s−1 with an estimated power consumption of 185 nW while coping with relocking periods of 7 ms.

scholarly journals A Framework Coupling VISSIM and OMNeT++ to Simulate Future Intelligent Transportation Systems

2021 ◽  
Vol 23 (2) ◽  
pp. C23-C29
Author(s):  
Tibor Petrov ◽  
Ilya Finkelberg ◽  
Nina Zarkhin ◽  
Peter Počta ◽  
Ľuboš Buzna ◽  
...  
Keyword(s):  
Communication Networks ◽  
Intelligent Transportation Systems ◽  
Communication Systems ◽  
Transportation Systems ◽  
Transport Systems ◽  
Wireless Communication Systems ◽  
Intelligent Transport ◽  
Transmission Reliability ◽  
The Relationship

With the spread of connected vehicles (CVs), a growth of novel information services exploiting data transmitted by CVs is expected. Wireless communication systems, in particular in vehicular applications, operate with a varying level of transmission reliability, which may affect the quality of V2X-data-driven intelligent transport systems (ITS). Therefore, the performance of ITS should be evaluated in a variety of conditions and the configuration of parameters should be fine-tuned in a safe testbed, using computer simulations. A simple framework is presented, which couples VISSIM traffic simulation and OMNeT++ communication networks simulation in real time, enabling an assessment of the relationship between a communication reliability and transport service quality. A functionality of the framework is demonstrated by applying it to a scheme controlling signalized intersections while estimating traffic flows from the V2I data.

A Generalized Approach on Outage Performance Analysis of Dual-Hop Decode and Forward Relaying for 5G and Beyond Scenarios

2021 ◽  
Author(s):  
Daljeet Singh
Keyword(s):  
Communication Systems ◽  
Cumulative Distribution Function ◽  
Signal To Noise Ratio ◽  
Cumulative Distribution ◽  
Wireless Communication Systems ◽  
Signal To Noise ◽  
Decode And Forward ◽  
Outage Performance ◽  
The Relationship ◽  
Universal Expression

Abstract This paper presents a generalized approach on performance of relay aided communication systems for 5G and beyond scenarios. A dual-hop decode and forwarding scheme is considered in the analysis. The relationship between the outage performance and cumulative distribution function (CDF) of signal to noise ratio (SNR) is exploited to derive a universal expression of outage probability valid for all fading scenarios irrespective of their nature or complexity. Further, an effort is made to parameterise the channel PDF in such a manner that reflects a commonly encountered practical fading scenario faced by current and future wireless communication systems. The analytical results obtained for various cases are validated by Monte-Carlo simulations.

Research on Characteristics of Field Uniformity in Reverberation Chamber Using Two TX Antennas

2012 ◽  
Vol E95.B (7) ◽  
pp. 2386-2392
Author(s):  
Jung-Hoon KIM ◽  
Tae-Heon JANG ◽  
Sung-Kuk LIM ◽  
Songjun LEE ◽  
Sung-Il YANG
Keyword(s):  
Reverberation Chamber ◽  
Field Uniformity

The Field Uniformity Analysis in a Triangular Prism Reverberation Chamber with a QRD

2011 ◽  
Vol E94-B (1) ◽  
pp. 334-337 ◽  
Author(s):  
Jung-Hoon KIM ◽  
Hye-Kwang KIM ◽  
Eugene RHEE ◽  
Sung-Il YANG
Keyword(s):  
Triangular Prism ◽  
Reverberation Chamber ◽  
Field Uniformity
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