Running a Script in Standard Mode Enhanced Data Rate Tests
MT8852B Operation Manual PN: 13000-00205 Rev. N 7-29
EDR Carrier & Modulation Test
This test verifies the transmitter carrier frequency stability and modulation accuracy. The
test comprises of both a frequency measurement and a Differential Error Vector Magnitude
(DEVM) measurement.
The frequency measurements defined are:-
• Initial frequency (
i
): This is the frequency error of the EDR packet measured across
the header part of the packet.
• Frequency Error (
o
): This is the frequency difference between the Initial Frequency
Error, and the average frequency of a 50 s block of payload data.
• Block frequency Error (
i
+
o
): This is the difference in frequency between any single
50 s payload block, and the header for the same packet.
The modulation measurements defined are;
• RMS DEVM. This is the average DEVM for all the symbols in each 50 us block
measured. The result is calculated for each block, and each block must pass the
following criteria, 0.20 for all /4DQPSK blocks and 0.13 for all 8DPSK blocks.
• Peak DEVM. This is the DEVM value of the single symbol in all the blocks measured
that has the highest value. The pass criterion is 0.35 for all /4DQPSK symbols and
0.25 for all 8DPSK symbols.
• 99% DEVM. This is the percentage of symbols measured in all the blocks that pass the
following limit. The pass criterion is 99% of all symbols are 0.30 for all /4DQPSK
symbols, and 99% of all symbols are 0.20 for all 8DPSK symbols.
Figure 7-41. Frequency Measurement
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