FCC-5G基站测试标准解读-占用带宽（OBW）

参考标准

FCC CFR 47 Part2, Clause 2.1049

FCC CFR 47 Part27, Clause 27.53

RSS-GEN, Clause6.7

测试方法

The EUT was set to transmit at maximum power and testing was carriedout on bottom, middle and top channels.Using the OccupiedBandwidth measurement functionin the spectrum analyzer, the26dB bandwidth was measured in accordance with FCC KDB 971168 D01. In addition,measurements of 99% occupied bandwidths were made in accordance with RSS-GEN.

The measurementmethod is from ANSI C63.26:

1. Thespectrum analyzer center frequency is set to the nominal EUT channel center frequency. The frequency span for thespectrum analyzer shall be set wide enough to capture all modulation productsincluding the emission skirts.

2. Thenominal IF filter bandwidth (3 dB RBW) shall be in the range of 1 to 5 % of theanticipated OBW, and the VBW shall be at least 3 times the RBW.

3. Setthe reference level of the instrument as required to keep the signal fromexceeding the maximum input mixer level for linear operation. In general, thepeak of the spectral envelope must be at least 10log (OBW / RBW) below thereference level.

4. Usethe 99 % power bandwidth function of the spectrum analyzer and report themeasured bandwidth.