The following documents list the allowed frequency bands for outdoor UWB communication in
the USA and Europe:
For the USA, refer to FCC Regulations – Title 47 Part 15, i.e., Part
15.250
For Europe, refer to ETSI TR 103 181-3 V1.1.1 (2020-08)
The following figure summarizes the country-wise permissible frequency bands.
The ATA8352 device can be used for all shown countries within the specified frequency
bands.
Figure 5-1. Certification
Bands
These regulations also define the output power, duration of transmission and
allowed out-of-band radiation of such devices within the permissible frequency band. To
achieve this regulation requirements, the device supports the modeling of the pulse
shape and to control the TX output power.
The pulse shape can be adjusted using register A15 for the ‘1’ symbol at
f0-m and A16 for the ‘0’ symbol at f0+m
(preceding figure). An example of such a pulse is shown in the following figure, and the
generation of such pulses is described in section 3.1 of the ATA8352 Impulse-Radio
Ultra-Wideband (IR-UWB) Transceiver User’s Guide (DS50003125). The pulse shaping
adjusts the emitted signal bandwidth by changing the duration, dt, and controlling
unwanted emissions by modeling the pulse shape. This adjustment depends on the design of
the RF path, the usage of filters in the RF path and the antenna design.
Figure 5-2. Pulse Shape
The A14 register (TX PA register) with the parameter txpa_sel_pwr[3:0] can control the
output power. The max. output power with txpa_sel_pwr[3:0] = 15
(‘1111’) defines a default setting, which can reduce in 16 steps. These
settings allow adjustment the TX output power level.
An example for the regulation limits is shown in the following figure, which is specific
to the USA and Europe. The power levels are defined with:
maximum mean EIRP spectral
density: highest signal strength measured in any direction at any frequency
within the defined range. The mean EIRP spectral density is measured with a 1
MHz resolution bandwidth, an RMS detector and an averaging time of 1 ms or
less.
maximum peak EIRP: highest signal
strength measured in any direction at any frequency within the defined
range.
The peak EIRP is measured within a 50 MHz bandwidth centered on the frequency at which
the highest mean radiated power occurs.
Figure 5-3. EIRP Emission Limits
(Example: European Union) [5]
Source: FCC Regulations –
Title 47 Part 15, i.e., Part 15.250
The online versions of the documents are provided as a courtesy. Verify all content and data in the device’s PDF documentation found on the device product page.
