3

Error vector magnitude (EVM) measurement

This measurement calculates composite EVM and several other

results relating to UE modulation quality.

Input level range

Average power

–25 to +28 dBm/1.28 MHz

UE ranges

EVM

≤ 20% rms

Frequency error

< ±20 kHz

Timing error

< ±25 chips

EVM measurement accuracy

(Includes residual EVM)

< ±2.5% rms

Filter

1.28 MHz (RRC)

Measurement results

EVM, magnitude error, phase

error, origin offset

Frequency error measurement

This measurement measures the difference between the carrier

frequency transmitted from the UE and the expected frequency.

The UE uses the same frequency source for both RF frequency

generation and the chip clock.

Input level range

Average power

–25 to +28 dBm/1.28 MHz

UE ranges

EVM

≤ 20% rms

Frequency error

< ±20 kHz

Timing error

< ±25 chips

Measurement accuracy

< (±10 Hz + timebase accuracy)

Filter

1.28 MHz (RRC)

Measurement results

Frequency error

Peak code domain error (PCDE) measurement

This measurement is computed by projecting power of the

error vector onto the code domain at a specific spreading

factor. The code domain error for every code in the domain

is defined as the ratio of the mean power of the projection

onto that code, to the mean power of the composite reference

waveform. This ratio is expressed in dB. The PCDE is defined

as the maximum value for the code domain error for all codes.

Input level range

Average power

–25 to +28 dBm/1.28 MHz

UE ranges

EVM

≤ 20% rms

Frequency error

< ±20 kHz

Timing error

< ±25 chips

Measurement accuracy

< ±0.3 dB

Filter

1.28 MHz (RRC)

Measurement results

Maximum value of CDE

Dynamic Power Measurement

This measurement provides a fast and flexible method for

calibrating the power accuracy of a wireless device by providing

multiple Tx power measurements at a single frequency. It tracks

and reports the power result for each step. To take advantage

of this measurement capability, the wireless device must have

a test mode that outputs an appropriate power ramp at each

frequency with the expected number of steps and dwell time

at each step (step length).

Input level range

Average power

–65 to +28 dBm/1.28 MHz

Amplitude capture range

With 7 dB crest factor

< ±2 dB of expected power

+2 to –42 dB of expected power

–54 to +28 dBm/1.28 MHz

< ±0.6 dB, typically < ±0.3 dB

–61 to < –54 dBm/1.28 MHz < ±0.7 dB, typically < ±0.4 dB

+2 to –42 dB of expected power

With < 48 hours warm-up before self alignment initiated

–54 to +28 dBm/1.28 MHz

< ±0.7 dB, typically < ±0.3 dB

–61 to < –54 dBm/1.28 MHz < ±0.8 dB, typically < ±0.4 dB

Measurement repeatability

Typically < ±0.05 dB

Trigger setup

Sources

External, fall, rise

Step Length and Number of Steps parameters are coupled to

the setting of the Filter:

Filter

Step length (SL)

Number of steps

1 kHz

0.5 to 180 ms

1 to (1048000/(21973 x SL))

30 kHz

0.25 to 180 ms

1 to (1048000/(60e3 x SL))

100 kHz

0.1 to 20 ms

1 to (1048000/(250e3 x SL))

300 kHz

0.1 to 20 ms

1 to (1048000/(600e3 x SL))

640 kHz

0.1 to 20 ms

1 to (1048000/(1.28e6 x SL))

1.23 MHz

0.1 to 20 ms

1 to (1048000/(2.46e6 x SL))

1.28 MHz

0.1 to 20 ms

1 to (1048000/(2.56e6 x SL))

1.6 MHz

0.1 to 20 ms

1 to (1048000/(3.2e6 x SL))

3.84 MHz

0.1 to 20 ms

0.1 to (1048000/(7.68e6 x SL))

5.0 MHz

0.1 to 20 ms

0.1 to (1048000/(10e6 x SL))

8PSK estimated

carrier power

0.575 to 20 ms

1 to 1047800/(1.0833e6 x SL)

GSM Tx power

0.1 to 20 ms

1 to (1048000/(320e3 x SL))

W-CDMA

mean power)

0.1 to 20 ms

1 to (1048000/(5.25e6 x SL))

Measurement result

A graph displaying the discrete power at each power step along

with numeric power results for each step

1. Additional accuracy error when using RF OUT ONLY port is < ±0.1 dB.