Available Error Summary Data (LTE)
contains information about the quality of the signal being analyzed (in the Measurement Interval). Below is a list of available data results. Click the name of a data result for more information.
Only and are calculated from the channels that are selected for analysis in the Composite Include list on the Profile tab. The other data results are not dependent on which channels are selected for analysis.
- 3GPP-defined QPSK EVM - RMS average EVM Error 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 modulation format. of PDSCH Physical Downlink Shared Channel QPSK Quadrature phase shift keying allocations, calculated according to the standard
- 3GPP-defined 16QAM EVM - RMS average EVM of PDSCH 16QAM allocations, calculated according to the standard
- 3GPP-defined 64QAM EVM - RMS average EVM of PDSCH 64QAM allocations, calculated according to the standard
- Cell ID - The physical-layer Cell ID of the signal
- Cell ID Group/Sector - The signal's Cell ID group and Cell ID sector, determined by physical-layer Cell ID
- Channel Power - Average power of the LTE Long Term Evolution signal
- Common Tracking Error - RMS average of the correction applied to each symbol by EVM Minimization
- CP Length Mode - Current CP 1) Contention period, or 2) Cyclic prefix Length: normal or extended (useful when CP Length is set to in demod properties)
- Data EVM - RMS Error Vector Magnitude of the user channels (PDSCH for downlink or PUSCH Physical Uplink Shared Channel, PUCCH Physical Uplink Control Channel, and SRS Signaling Reference Signal for uplink)
- EVM - Overall RMS Error Vector Magnitude for all selected channels in Composite Include
- EVM Pk - The peak EVM value and location of the peak EVM
- Freq Err - Average carrier frequency error
- In-band Emissions Result - Result of limit test on the In-band Emissions trace
- IQ Gain Imbalance - I vs Q amplifier gain imbalance (ratio of I-gain to Q-gain)
- IQ Offset - Magnitude of carrier feedthrough
- IQ Quad. Error - Amount of angle skew between I and Q
- IQ Timing Skew - Time difference between the I and Q parts of the signal
- OFDM Sym. Tx. Power - Average power (dBm deciBels referenced to a milliWatt: dB relative to 1 milliwatt dissipated in the nominal input impedance of the analyzer) for OFDM Orthogonal Frequency Division Multiplexing: OFDM employs multiple overlapping radio frequency carriers, each operating at a carefully chosen frequency that is Orthogonal to the others, to produce a transmission scheme that supports higher bit rates due to parallel channel operation. OFDM is an alternative tranmission scheme to DSSS and FHSS. data subcarriers, can be used to calculate OSTP as defined in Section F.3.3 of 3GPP TS Technical Specification 36.141
- Ref. Path Phase - (available only on the API 1) Access Preamble Indicator, or 2) Application Programming Interface) - the absolute phase in degrees of the reference signal (C-RS Cell-specific RS/P-SS Primary Synchronization Signal/DM-RS DeModulation Reference Signal (LTE)) of the reference path
- RS EVM - RMS Error Vector Magnitude of the reference signal
- RS-PRS - The current setting of the RS-PRS measurement parameter
- RS Rx. Power (Avg) - Average Cell-specific Reference Signal "Received" Power (dBm), can be used to calculate RSRP as defined in Section 5.1.1 of 3GPP TS 36.214
- RS Rx. Quality - Cell-specific RS Receive Quality, can be used to calculate RSRQ as defined in Section 5.1.3 of 3GPP TS 36.214
- RS Tx. Power (Avg) - Average (dBm) reference signal power, can be used to calculate RSTP as defined in Section F.3.3 of 3GPP TS 36.141
- RSSI - Received Signal Strength Indicator
- Spectral Flatness Result - Result of limit test on the Per Slot Eq Chan Freq Resp trace
- SyncCorr - Correlation between the measured P-SS signal and the reference P-SS signal
- SymClk Err - Frequency error of the measured signal's symbol clock
- Time Offset - The distance from the start of the Search Time trace to the beginning of the Measurement Interval
See Also
