User Manual

2022-11
14
IUH-F192-V1-*
Product Description
3.2.7 Frequency Hopping Spread Spectrum
With FHSS (Frequency Hopping Spread Spectrum), the information to be transmitted is distrib-
uted successively through multiple channels. Only one frequency channel is used at any one
time. This results in a larger bandwidth for the entire signal, in spite of the fact that each chan-
nel has a smaller bandwidth. In this section the channel assignment for China and the USA is
shown graphically. For both assignments, different parameters apply, such as channel number
and channel bandwidth. Different parameterizations apply in other countries.
3.2.7.1 China
In China, the frequency range 920 MHz ... 925 MHz is available for UHF-RFID read/write
devices. The range is split into channels, each with a bandwidth of 250 kHz. A maximum of 2
W
erp
is permitted on 16 of the available channels. The transmission power is indicated in W
erp
.
FHSS is used with a maximum retention time of two seconds. The UHF RFID read/write device
for China uses channel 2 to 17.
Figure 3.3
3.2.7.2 USA
The ISM band from 902 MHz ... 928 MHz is available in the USA. The band is split into 50
channels, each with a 500 kHz bandwidth. FHSS with a maximum retention time of 0.4 sec-
onds is used. All channels must be used. Channel restriction is not permitted.
In contrast to the read/write devices for Europe and China, the transmission power is indicated
in W
eirp
. A maximum of 4 W
eirp
is permitted on all channels.
Figure 3.4
3.2.8 Relevant Standards for UHF
European radio standards: EN 300220 and EN 302208
Usage recommendations for RFID type labels, information about recycling, installation of read-
ers and antennae: ISO/IEC TR 24729 parts 1-4
Installation and commissioning of UHF-RFID systems: ETSI TR 102436
Description of air interface: EPC Gen 2 (ISO/IEC 18000-63)
Channel
0.1
2.0
920 925920.625 924.375 MHz
W
erp
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
0.2
4.0
902.75 927.25MHz
Channel
W
eirp
10 15 2051 30 35 4025 45 50