Carrier Summary (Custom OFDM)

The Carrier Summary trace displays measurement results in a per-carrier format.

Carrier Summary is a type of Matrix Table that provides selectable column visibility and copy/paste and export functionality to share rows of content or complete tables to applications like email, text editing or spreadsheet programs.


Carrier is the name of the component carrier (CCn).	Center is the absolute center frequency of the component carrier.	Offset is the frequency offset from the reference frequency.	System Rate is the component carrier's 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. system rate in Hz.	EVM/MER is the RMS value of the component carrier EVM or MER over the entire burst (includes, Preamble, Pilot, and Data subcarriers) When Display EVM in Percent is not selected (default), EVM/MER data is expressed as a MER value in decibels (dB). When Display EVM in Percent is selected, EVM/MER data is expressed as a percent (EVM). The default unit is dB. Checking the Display EVM in Percent parameter will show EVM in percent.	Power is the component carrier average channel power (in dBm) of the OFDM signal and is calculated in the time domain over all symbols in the Measurement Interval, excluding any configured Time Gap (Samples) Per Symbol.	Freq Error is the component carrier frequency error relative to the measurement hardware's center frequency. This parameter is displayed in Hertz and is the amount of frequency shift, from the measurement hardware's center frequency, that the VSA must perform to achieve carrier lock. Errors in RF Radio Frequency: A generic term for radio-based technologies, operating between the Low Frequency range (30k Hz) and the Extra High Frequency range (300 GHz). frequency, LO frequency, or digitizer clock rate could all be contained in the carrier frequency error.	Sym Clk Error is the component carrier symbol clock frequency error, which is the difference between the ideal and actual symbol clock frequency (in ppm). A symbol clock frequency that is less than ideal will cause the OFDM symbol time to take longer than required resulting in a decreased OFDM subcarrier spacing. A symbol clock frequency that is greater than ideal will cause the symbol times to take less time than required resulting in an increased OFDM subcarrier spacing. In either case this creates subcarrier interference and increases the signal's EVM. The resultant error value is a unitless fraction, which is multiplied by 1,000,000 to obtain SymClkErr in ppm.

Carrier

Center (Hz)

Offset (Hz)

System Rate (Hz)

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./MER (dB)

Power (dBm deciBels referenced to a milliWatt: dB relative to 1 milliwatt dissipated in the nominal input impedance of the analyzer)

Freq Error (Hz)

Sym Clk Error (ppm)

Carrier is the name of the component carrier (CCn).

Center is the absolute center frequency of the component carrier.

Offset is the frequency offset from the reference frequency.

System Rate is the component carrier's 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. system rate in Hz.

EVM/MER is the RMS value of the component carrier EVM or MER over the entire burst (includes, Preamble, Pilot, and Data subcarriers)

When Display EVM in Percent is not selected (default), EVM/MER data is expressed as a MER value in decibels (dB). When Display EVM in Percent is selected, EVM/MER data is expressed as a percent (EVM).

The default unit is dB. Checking the Display EVM in Percent parameter will show EVM in percent.

Power is the component carrier average channel power (in dBm) of the OFDM signal and is calculated in the time domain over all symbols in the Measurement Interval, excluding any configured Time Gap (Samples) Per Symbol.

Freq Error is the component carrier frequency error relative to the measurement hardware's center frequency. This parameter is displayed in Hertz and is the amount of frequency shift, from the measurement hardware's center frequency, that the VSA must perform to achieve carrier lock.

Errors in RF Radio Frequency: A generic term for radio-based technologies, operating between the Low Frequency range (30k Hz) and the Extra High Frequency range (300 GHz). frequency, LO frequency, or digitizer clock rate could all be contained in the carrier frequency error.

Sym Clk Error is the component carrier symbol clock frequency error, which is the difference between the ideal and actual symbol clock frequency (in ppm).

A symbol clock frequency that is less than ideal will cause the OFDM symbol time to take longer than required resulting in a decreased OFDM subcarrier spacing.

A symbol clock frequency that is greater than ideal will cause the symbol times to take less time than required resulting in an increased OFDM subcarrier spacing.

In either case this creates subcarrier interference and increases the signal's EVM.

The resultant error value is a unitless fraction, which is multiplied by 1,000,000 to obtain SymClkErr in ppm.