Ieee 802.15.4 Phy Layer; Table 2. Ieee 802.15.4 Phy Parameters - ST SimpleMAC STM32W108 Series User Manual

UM0893
2.3.1

IEEE 802.15.4 PHY layer

The PHY layer manages the physical RF transceiver. It is also in charge of the following
tasks:
●
Activating and deactivating of the radio transceiver
●
Energy detection for the current channel
●
Indicating link quality for the received packets
●
CCA for the CSMA-CA
●
Selecting channel frequency
●
Data transmission and reception
The standard specifies two PHY layers:
●
868/915 MHz direct sequence spread spectrum (DSSS) PHY
–
–
● 2 450 MHz DSSS PHY supporting sixteen 250 Kbps channels in the 2.4 GHz band
Table 2.
Sensitivity @ 1% PER
Receiver maximum input level
Adjacent channel rejection
Alternate channel rejection
Output power (lowest maximum)
Transmit modulation accuracy
Number of channels
Channel spacing
Transmission rates:
Data rate
Symbol rate
Chip rate
Chip modulation
IEEE 802.15.4 PHY CCA
The following CCA modes are supported:
●
CCA mode 1: energy above threshold (lowest)
●
CCA mode 2: carrier sense (medium)
●
CCA mode 3: carrier sense with energy above threshold (strongest)
One 20 Kbps channel in the European 868 MHz band
Ten 40 Kbps channels in the 915 MHz ISM band (from 902 to 928 MHz)
IEEE 802.15.4 PHY parameters
Parameter
Doc ID 16995 Rev 10
2.4 GHz PHY
-85 dBm
EVM < 35% for 1000 chips
16
5 MHz
250 kbps
62.5 ksymbol/s
2 Mchip/s
O-QPSK with half-sine pulse
shaping
IEEE 802.15.4 protocol
868/915 MHz PHY
-92 dBm
-20 dBm
0 dB
30 dB
-3 dBm
1/10
Single-channel at 2 MHz
20/40 kbps
20/40 ksymbol/s
300/600 kchip/s
BPSK with raised cosine
pulse shaping
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