11 Input intermodulation

25.1163GPPRelease 17TSUTRA repeater radio transmission and reception (LCR TDD)

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

The input intermodulation is a measure of the capability of the repeater to inhibit the generation of interference in the pass band, in the presence of interfering signals on frequencies other than the pass band.

11.1 General requirement

The following requirement applies for interfering signals in the frequency bands defined in sub-clause 5.2, depending on the repeaters pass band.

This requirement applies to the uplink and downlink of the repeater, at maximum gain.

11.1.1 Minimum requirement

For the parameters specified in table 11.1.1-1, the power in the pass band shall not increase with more than 10 dB at the output of the repeater as measured in the centre of the pass band, compared to the level obtained without interfering signals applied.

The frequency separation between the two interfering signals shall be adjusted so that the 3^rd order intermodulation product is positioned in the centre of the pass band.

Table 11.1.1-1 specifies the parameters for two interfering signals, where:

– f₁ offset is the offset from the channel edge frequency of the first or last channel in the pass band of the closer carrier.

Table 11.1.1-1: Input intermodulation requirement

f₁ offset	Interfering Signal Levels	Type of signals	Measurement bandwidth
1,0 MHz	-40 dBm	2 CW carriers	1 MHz