Rohde & Schwarz CMU-K20, Руководство по эксплуатации

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CMU-K20/K21/K22/K23/K24 Non Signalling: Power Measurements
1115.6088.12 4.33 E-11
carrier power over the useful part of the burstduration of the burst as received by the CMU.
The burst is fitted into the tolerance template such that the transition between bit 13/14 of
the training sequence corresponds to the center of the useful part of the burst. This timing
reference can be modified via the
Time softkey, see section Test Settings on page 4.9 .
4.9.
Fig. 4-11 GSM power/time template for normal and access bursts with GMSK modulation
The two edges of the tolerance templates are defined as a function of the power control level of the
mobile phone. The following specifications apply to both modulation schemes (
Fig. 4-11 and Fig. 4-12 ):
GSM400/850/900-MS GSM1800/1900-MS
(*) –4.0 dBc for power control level (PCL) 16; –4.0 dBc for PCL 11
–2.0 dBc for PCL 17; –2.0 dBc for PCL 12
–1.0 dBc for PCL 18 and 19. –1.0 dBc for PCL 13, 14, and 15.
(**) –30.0 dBc or –17.0 dBm (higher value) –30.0 dBc or –20.0 dBm (higher value)
(***) –59.0 dBc or –36.0 dBm (higher value) –48 dBc or -48 dBm (higher value)
The limit lines for GMSK and 8PSK modulation are set in separate table sections but in an analogous
way:
8PSK modulation
8PSK modulation was introduced to GSM with release 1999 (GSM 05.05 version 7.1.0).
8PSK channels (the so-called EDGE channels) are used for data transmission; only normal
bursts are transmitted. The modulating symbol rate is the same as in GMSK modulation
(270.833 ksymb/s), which corresponds to a bit rate of 3 x 270.833 kbit/s. The CMU uses the
same time scale for both modulation schemes; a symbol duration in GMSK modulation is
equal to a symbol duration in 8PSK modulation.
The power template for 8PSK burst differs from the GMSK power template; see
Fig. 4-12
below. In analogy to GMSK modulation, the limit lines at the edges of the burst depend on
the PCL of the mobile phone.
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