E.5 Frequency error and modulation accuracy
3GPP45.005GSM/EDGE Radio transmission and receptionTS
E.5.1 Frequency error
This clause applies only to repeater systems using frequency shift.
The average frequency deviation of the output signal with respect to the input signal of the repeater system shall not be more than 0,1 ppm. The specified value applies to a complete repeater system signal path. Consequently a single repeater unit is limited to an average frequency deviation of not more than 0.05 ppm with respect to its wanted output frequency.
E.5.2 Modulation accuracy at GMSK modulation
This clause applies only to repeater systems using frequency shift.
For a complete repeater system operating at the nominal output power as specified by the manufacturer shall the increase in phase error of a GSM input signal, which meets the phase error requirements of subclause 4.6, not exceed the values in subclause 4.6 by 2 degrees RMS and by 8 degrees peak. For a single repeater unit operating at the nominal output power as specified by the manufacturer shall the increase in phase error of a GSM input signal, which meets the phase error requirements of subclause 4.6, not exceed the values in subclause 4.6 by 1.1 degrees RMS and by 4.5 degrees peak.
E.5.3 Modulation accuracy at 8-PSK, 16-QAM, 32-QAM, QPSK and AQPSK modulation
This clause applies only to repeater systems supporting 8-PSK, 16-QAM, 32-QAM, QPSK and/or AQPSK.
For a repeater as defined in the first column of the table E.5-1 below and operating at the nominal output power as specified by the manufacturer, the RMS EVM of the output RF signal for an ideal GSM 8-PSK, 16-QAM, 32-QAM, QPSK and AQPSK input signal (if supported) according to subclause 4.6, shall not exceed the requirement as defined in the table below.
Table E.5-1 EVM requirements for higher order modulations
|
Normal symbol rate |
Higher symbol rate |
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|
AQPSK (1) |
8-PSK |
16-QAM |
32-QAM |
QPSK |
16-QAM |
32-QAM |
||
|
For a single repeater with no shift in frequency from input to output |
under normal conditions |
4,0% |
8,0 % |
4,0 % |
4,0 % |
8,0 % |
4,0 % |
4,0 % |
|
For a single repeater with no shift in frequency from input to output |
under extreme conditions |
5,0% |
8,0 % |
5,0 % |
5,0 % |
8,0 % |
5,0 % |
5,0 % |
|
For a complete repeater system using frequency shift |
under normal conditions |
6,0% |
11 % |
6,0 % |
6,0 % |
11 % |
6,0 % |
6,0 % |
|
For a complete repeater system using frequency shift |
under extreme conditions |
7,0% |
11 % |
7,0 % |
7,0 % |
11 % |
7,0 % |
7,0 % |
|
NOTE 1: Only for downlink, regardless of SCPIR_DL value falling in the range defined in 3GPP TS 45.004 Clause 6.2. |
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NOTE: Repeaters with higher RMS EVM value may be used in systems utilizing 8-PSK, 16-QAM, 32-QAM, QPSK and AQPSK, if all other repeater requirements in this Annex are fulfilled. However, the system performance will be degraded.
In addition the origin offset suppression according to Annex G shall not exceed –35 dBc.
Annex F (normative):
Antenna Feeder Loss Compensator Characteristics (GSM 400, GSM 900 and DCS 1800)