Computing Error Vector Magnitude
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Error Vector Magnitude Matlab
Sheets Reference Designs 11 Myths About... Electronic Design Library CommunityBlogs Bob Pease Contributing Technical Experts Engineering Hall of Fame Interviews Our Editors STEM Starter Tournament Pop Quizzes Engineering Bracket Challenge CompaniesCompany Directory Part Search Advertisement Home > Learning Resources > Engineering Essentials > Understanding Error Vector Magnitude Understanding Error Vector Magnitude This measure error vector magnitude equation of modulation quality may be a better predictor of wireless reliability than BER. Oct 10, 2013 Lou Frenzel | Electronic Design EMAIL Tweet Comments 0 Learn the meaning and importance of error vector magnitude measurements. Download this article in .PDF format This file type includes high resolution graphics and schematics when applicable. Error vector magnitude (EVM) is a measure of modulation quality and error performance in complex wireless systems. It provides a method to evaluate the performance of software-defined radios (SDRs), both transmitters and receivers. It also is widely used as an alternative to bit error rate (BER) measurements to determine impairments that affect signal reliability. (BER is the percentage of bit errors that occur for a given number of bits transmitted.) EVM provides an improved picture of the modulation quality as well. Related 3G Transceiver Consumes 30% Less Power And Delivers 50% Better EVM VSA App Adds Multi-Measurement Signal Analyzer Capability Understanding Cell-Aware ATPG And User-Defined Fa
Search All Support Resources Support Documentation MathWorks Search MathWorks.com MathWorks Documentation Support Documentation Toggle navigation Trial Software Product Updates Documentation Home Communications System Toolbox Examples Functions and Other Reference error vector magnitude pdf Release Notes PDF Documentation Measurements, Visualization, and Analysis Communications System Toolbox Blocks EVM
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Measurement On this page Library Description Data Type Parameters Examples Measure RMS and 90th Percentile EVM Related Examples Algorithms
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References See Also More About This is machine translation Translated by Mouse over text to see original. Click the button below to return to the English verison of the page. Back http://electronicdesign.com/engineering-essentials/understanding-error-vector-magnitude to English × Translate This Page Select Language Bulgarian Catalan Chinese Simplified Chinese Traditional Czech Danish Dutch English Estonian Finnish French German Greek Haitian Creole Hindi Hmong Daw Hungarian Indonesian Italian Japanese Korean Latvian Lithuanian Malay Maltese Norwegian Polish Portuguese Romanian Russian Slovak Slovenian Spanish Swedish Thai Turkish Ukrainian Vietnamese Welsh MathWorks Machine Translation The automated translation of this page is provided by a http://www.mathworks.com/help/comm/ref/evmmeasurement.html general purpose third party translator tool. MathWorks does not warrant, and disclaims all liability for, the accuracy, suitability, or fitness for purpose of the translation. Translate EVM MeasurementMeasure error vector magnitudeexpand all in pageLibraryUtility Blocks DescriptionThe EVM Measurement block measures the error vector magnitude (EVM), which is an indication of modulator or demodulator performance. The block has one or two input signals: a received signal and, optionally, a reference signal. You must select if the block uses a reference from an input port or from a reference constellation. The block normalizes to the average reference signal power, average constellation power, or peak constellation power. For RMS EVM, maximum EVM, and X-percentile EVM, the output computations reflect the normalization method.The default EVM output is the RMS EVM in percent, with an option of maximum EVM or X-percentile EVM values. The maximum EVM represents the worst-case EVM value per burst. For the X-percentile option, you can enable an output port that returns the number of symbols processed in the percentile computations.The table shows the output type, the parameter that selects the output type, the computation units, and the corresponding measurement
detected symbol location—which connects the I/Q reference-signal vector to the I/Q measured-signal vector. The following graphic shows the calculation of the EVM metric as well as a diagram showing how a single error vector is calculated. EVM is calculated http://rfmw.em.keysight.com/wireless/helpfiles/89600B/webhelp/subsystems/digdemod/content/digdemod_symtblerrdata_evm.htm from the symbol points (the instant in time when symbols are detected). The computation does not include points between symbols. Therefore Points / Symbol does not affect the value. The Syms/Errs table also shows the location of the symbol that has the largest EVMError vector magnitude (EVM): A quality metric in digital communication systems. See the EVM metric in the Error Summary Table topic in each demodulator for more information on how EVM is calculated for that error vector modulation format.. For constellations with constant magnitude (QPSKQuadrature phase shift keying, BPSKBinary phase shift keying - A type of phase modulation using 2 distinct carrier phases to signal ones and zeros., 8PSK, etc.), the EVMs are always normalized to the constellation maximum. For constellations with multiple possible magnitudes (APSK, StarQAM, 16QAM, 32QAM, etc.), the EVMs are normalized to the EVM Normalization Reference. Shaped OQPSKOffset Quadrature Phase Shift Keying: A type of QPSK modulation that offsets the bit streams error vector magnitude on the I and Q channels by a half bit. This reduces amplitude fluctuations and helps improve spectral efficiency. and Offset QPSK use two points-per-symbol (symbols and midpoints between symbols) to compute EVM and peak EVM due to the offset between IandQ. For Offset QPSK, when the Half Sine Filter is selected, the OQPSK reference constellation points fall on a circle with a magnitude of sqrt(2)/2, but the EVM is still expressed as a percentage of the magnitude of a QPSK symbol point (magnitude = 1). For the EDGEEnhanced Data for Global Evolution: A technology that gives GSMA and TDMA similar capacity to handle services for the third generation of mobile telephony. EDGE was developed to enable the transmission of large amounts of data at a high speed, 384 kilobits per second. (It increases available time slots and data rates over existing wireless networks.) demodulation format, the EVM, Phase, and Magnitude Error data results may vary for different Points / Symbol settings. When Points / Symbol is set to 1 (default), the trace data results are compensated for ISIInter-Symbol Interference: An interference effect where energy from prior symbols in a bit stream is present in later symbols. ISI is normally caused by filtering of the data streams. (inter-symbol interference). For Points / Symbol greater than one, the trace data results are not compensated for the effects of ISI. If the