3-2 Mobile WiMAX Measurements Chapter 3 —Mobile WiMAX Signal Analyzer
3-2 PN: 10580-00236 Rev. D WiMAX MG
Relative Constellation Error (RCE)
Relative Constellation Error is similar to EVM but is expressed in dB (RCE = 20 log
(EVM in %⁄100)). Both rms and peak values over an entire downlink subframe are displayed.
(The preamble portion is excluded for this measurement).
Carrier Frequency
Carrier frequency is the measured frequency of the input signal after demodulation, and is
the same as the tuned center frequency of the instrument plus the measured frequency error
from demodulation.
Base Station ID
The unique code contained in messages on the broadcast channels of a cell or base station
that identifies the base station.
Sector ID
Three cell sectors may produce signals with different preambles. The Sector ID may be
0, 1, or 2. The Sector ID is displayed in several of the Demodulator measurement screen.
CINR
Carrier to Interference-plus-Noise Ratio (CINR), expressed in decibels (dBs), is a
measurement of signal effectiveness. The carrier is the desired signal, and the interference
can either be noise or co-channel interference or both. In order for the signal receiver to be
able to decode the signal, the signal must fall into an acceptable CINR range.
PCINR
Physical CINR is an estimate of C / (N+I) ratio on non-boosted data sub-carriers. It is
calculated by measuring the power of the sub-carriers in the preamble (where the sub-carrier
allocations are known for the primary BS and interfering BS). The power of the primary
preamble detected is used as the carrier power (C). The power of all the other interfering
preambles is used as the interference power (I) and the noise (N) is measured using the power
in the guard interval.
Adjacent Subcarrier Flatness (Peak)
Adjacent Subcarrier Flatness is the absolute difference between adjacent subcarriers in the
Spectral Flatness measurement.
Preamble Scanner
This measurement displays the six strongest preamble signals in bar graph form. The
Preamble Index, Relative Pwr, Cell ID, and Sector ID are listed for each preamble signal.
The PCINR, calculated from all six preambles, and the Base Station ID, of the strongest
preamble signal, are listed below the table.
ООО "Техэнком" Контрольно-измерительные приборы и оборудование www.tehencom.com
To Next Page
Loading...
Need help?
General
