Atec Rohde-Schwarz-CMW500 - Manual (Page 45)

Version 11.00, May 2013
Rohde & Schwarz R&S ® CMW500 Wideband Radio Communication Tester 45
High throughput (HT)
PPDU format legacy mode,
mixed mode,
greenfield mode
Modulation analysis
Bandwidth 20 MHz, 40 MHz
Level range –28 dBm to +42 dBm 27
Payload length ≥ 16 symbol or
≥ 403 byte
Analysis modes BPSK code rate 1/2 (MCS0),
BPSK code rate 3/4,
QPSK code rate 1/2 (MCS1),
QPSK code rate 3/4 (MCS2),
16QAM code rate 1/2 (MCS3),
16QAM code rate 3/4 (MCS4),
64QAM code rate 1/2,
64QAM code rate 2/3 (MCS5),
64QAM code rate 3/4 (MCS6),
64QAM code rate 5/6 (MCS7)
for optional 40 MHz MCS format BPSK code rate 1/2 (MCS32)
Measured parameters
numeric results and standard deviation burst power,
EVM all carriers,
EVM data carriers,
EVM pilot carriers,
center frequency error,
symbol clock error,
I/Q offset,
gain imbalance,
quadrature error
graphical EVM versus symbol,
EVM versus carrier,
spectrum flatness
Error vector magnitude (EVM)
Inherent EVM 28 IEEE 802.11n (2.4 GHz band)
–28 dBm ≤ input level ≤ +42 dBm 27 ,
RMS
< –40 dB, RMS 29
IEEE 802.11n (5 GHz band)
–18 dBm ≤ input level ≤ +42 dBm 27 ,
RMS
< –40 dB, RMS 29
Measurement length entire PPDU
Center frequency error
Frequency measurement uncertainty IEEE 802.11n (2.4 GHz band),
for ≥ 100 symbol (400 µs) < 20 Hz + drift of timebase,
see general technical specifications
IEEE 802.11n (5 GHz band),
for ≥ 100 symbol (400 µs) < 35 Hz + drift of timebase,
see general technical specifications
Symbol clock error
Uncertainty < 1 ppm
I/Q offset
Inherent I/Q offset for average ≥ 10 measurements < –45 dB
27 The maximum permissible continuous power is +34 dBm due to thermal limits.
28 Measured with channel estimation based on payload.
29 3 dB less with R&S ® CMW-H590D RF frontend (ADV.).