E1969A Datasheet, PDF (11/19 Pages) Keysight Technologies – TD-SCDMA_GSM Fast Switch Test Application

11 | Keysight | TD-SCDMA_GSM Fast Switch Test Application - Technical Overview
Measurements Technical Specifications
Transmitter measurements
Channel power measurement
Measurement method: The average power measured in one timeslot
Mean power: Measured with a bandwidth of at least (1 + α) x chip rate, where α =
0.22 and chip rate = 1.28 Mcps
RRC filtered mean power: Measured with a root-raised cosine (RRC) filter with roll-
off α = 0.22 and a bandwidth equal to the chip rate (1.28 MHz)
Measurement level range: –65 to +28 dBm/1.28 MHz; measured signal level is expected
within ±9 dB of the expected power and has a < 10.0 dB crest factor
Frequency capture range: –20 to +20 kHz from the expected measurement receiver
frequency
Timing capture range: –25 to +25 chips from the measurement trigger
Measurement interval: 1 timeslot excluding the guard period, 662.5 µs
Measurement accuracy (at ±10 °C from the calibration temperature):
TD-SCDMA and TD-HSDPA: < ±1 dB (typically < ±0.6 dB) for –65 to 30 dBm
TD-HSUPA: < ±1 dB (typically < ±0.6 dB) for −65 to 30 dBm, Bands 34 and 39
< ±1 dB (typically < ±0.6 dB) for −50 to 30 dBm, Bands 40 and 41
< ±1.3 dB (typically < ±0.8 dB) for −60 to –50 dBm, Band 40 typically
< ±0.8 dB for −65 to –50 dBm, Band 41
Measurement triggers: Auto, immediate, protocol, external, and RF rise
Temperature range: +20 to +55 °C
Waveform quality measurement
Measurement method: The measurement is used to cover the following tests
Error vector magnitude (EVM): The difference between the measured waveform
and the theoretical modulated waveform (the error vector). Both waveforms pass
through a matched root raised cosine filter with bandwidth 1.28 MHz and roll-off α
= 0.22. Both waveforms are then further modified by selecting the frequency, abso-
lute phase, absolute amplitude, and chip clock timing so as to minimize the error
vector. The EVM result is defined as the square root of the ratio of the mean error
vector power to the mean reference signal power expressed as a %
Frequency stability (frequency error): The difference of the modulated carrier
frequency between the RF transmission from the UE and the RF transmission from
the BS
Peak code domain error: Computed by projecting the error vector power onto the
code domain at a specific spreading factor. The error power for each code is defined
as the ratio to the mean power of the projection onto the code, to the mean power of
the composite reference waveform expressed in dB. The peak code domain error is
defined as the maximum value for code domain error
Measurement level range: –25 to +28d Bm/1.28 MHz; measured signal level is expected
within ±9 dB of the expected power and has a < 10.0 dB crest factor
Frequency capture range: –20 to +20 kHz from the expected measurement receiver
frequency for TD-SCDMA channel type; –2 to +2 kHz from the expected measurement
receiver frequency for HSDPA channel type
Timing capture range: –25 to +25 chips from the measurement trigger
Measurement interval: 1 timeslot excluding the guard period, 662.5 µs
Measurement EVM range: < 20% rms