Specifications

ETSI

Final draft ETSI EN 300 328 V1.8.1 (2012

04)

5.3.7.2.1.1 Adaptive Frequency Hopping equipment using DAA

The different steps below define the procedure to verify the efficiency of the DAA based adaptive mechanisms for

frequency hopping equipment. These mechanisms are described in clause 4.3.1.6.

Step 1:

• The UUT may connect to a companion device during the test. The interference signal generator, the blocking

signal generator, the spectrum analyser, the UUT and the companion device are connected using a set-up

equivalent to the example given by figure 5, although the interference and blocking signal generators do not

generate any signals at this point in time. The spectrum analyser is used to monitor the transmissions of the

UUT in response to the interfering and the blocking signals.

• For the hopping frequency to be tested, adjust the received signal level (wanted signal from the companion

device) at the UUT to the value defined in table 3 (clause 4).

NOTE 1: Testing of Unidirectional equipment does not require a link to be established with a companion device.

• The analyzer shall be set as follows:

- RBW:

Occupied Channel Bandwidth (use next available RBW setting above the

Occupied Channel Bandwidth)

- Filter type: Channel Filter

- VBW:

RBW

- Detector Mode: RMS

- Centre Frequency: Equal to the hopping frequency to be tested

- Span: 0 Hz

- Sweep time: > Channel Occupancy Time of the UUT. If the Channel Occupancy Time is

non-contiguous (non-LBT based equipment), the sweep time shall be sufficient to

cover the period over which the Channel Occupancy Time is spread out.

- Trace Mode: Clear/Write

- Trigger Mode: Video

Step 2:

• Configure the UUT for normal transmissions with a sufficiently high payload to allow demonstration of

compliance of the adaptive mechanism on the hopping frequency being tested.

• Using the procedure defined in clause 5.3.7.2.1.4, it shall be verified that, for systems with a dwell time greater

than the maximum allowable Channel Occupancy Time, the UUT complies with the maximum Channel

Occupancy Time and minimum Idle Period defined in clauses 4.3.1.6.1.2 and 4.3.1.6.2.2.

Step 3: Adding the interference signal

• A 100 % duty cycle interference signal is injected centred on the hopping frequency being tested. This

interference signal shall be a band limited noise signal which has a flat Power Spectral Density, and shall have

a bandwidth greater than the Occupied Channel Bandwidth of the UUT. The maximum ripple of this

interfering signal shall be ±1,5 dB within the Occupied Channel Bandwidth and the Power Spectral Density (at

the input of the UUT) shall be as defined in clauses 4.3.1.6.1.2 or 4.3.1.6.2.2.

Step 4: Verification of reaction to the interference signal

• The spectrum analyser shall be used to monitor the transmissions of the UUT on the selected hopping

frequency with the interfering signal injected. This may require the spectrum analyser sweep to be triggered by

the start of the interfering signal.