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CC2480
10.1 IEEE 802.15.4 Modulation Format
This section is meant as an introduction to the
2.4 GHz direct sequence spread spectrum
(DSSS) RF modulation format defined in IEEE
802.15.4. For a complete description, please
refer to [1].
The modulation and spreading functions are
illustrated at block level in Figure 10 [1]. Each
byte is divided into two symbols, 4 bits each.
The least significant symbol is transmitted first.
For multi-byte fields, the least significant byte
is transmitted first.
Each symbol is mapped to one out of 16
pseudo-random sequences, 32 chips each.
The symbol to chip mapping is shown in Table
20. The chip sequence is then transmitted at 2
MChips/s, with the least significant chip (C 0 )
transmitted first for each symbol.
Transmitted
bit-stream
(LSB first)
Bit-to-
Symbol
Symbol-
to-Chip
O-QPSK
Modulator
Modulated
Signal
Figure 10: Modulation and spreading functions [1]
The modulation format is Offset – Quadrature
Phase Shift Keying (O-QPSK) with half-sine
chip shaping. This is equivalent to MSK
sine, transmitted alternately in the I and Q
channels with one half chip period offset. This
is illustrated for the zero-symbol in Figure 11.
modulation. Each chip is shaped as a half-
Table 20: IEEE 802.15.4 symbol-to-chip mapping [1]
Symbol
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Chip sequence (C 0 , C 1 , C 2 , … , C 31 )
1 1 0 1 1 0 0 1 1 1 0 0 0 0 1 1 0 1 0 1 0 0 1 0 0 0 1 0 1 1 1 0
1 1 1 0 1 1 0 1 1 0 0 1 1 1 0 0 0 0 1 1 0 1 0 1 0 0 1 0 0 0 1 0
0 0 1 0 1 1 1 0 1 1 0 1 1 0 0 1 1 1 0 0 0 0 1 1 0 1 0 1 0 0 1 0
0 0 1 0 0 0 1 0 1 1 1 0 1 1 0 1 1 0 0 1 1 1 0 0 0 0 1 1 0 1 0 1
0 1 0 1 0 0 1 0 0 0 1 0 1 1 1 0 1 1 0 1 1 0 0 1 1 1 0 0 0 0 1 1
0 0 1 1 0 1 0 1 0 0 1 0 0 0 1 0 1 1 1 0 1 1 0 1 1 0 0 1 1 1 0 0
1 1 0 0 0 0 1 1 0 1 0 1 0 0 1 0 0 0 1 0 1 1 1 0 1 1 0 1 1 0 0 1
1 0 0 1 1 1 0 0 0 0 1 1 0 1 0 1 0 0 1 0 0 0 1 0 1 1 1 0 1 1 0 1
1 0 0 0 1 1 0 0 1 0 0 1 0 1 1 0 0 0 0 0 0 1 1 1 0 1 1 1 1 0 1 1
1 0 1 1 1 0 0 0 1 1 0 0 1 0 0 1 0 1 1 0 0 0 0 0 0 1 1 1 0 1 1 1
0 1 1 1 1 0 1 1 1 0 0 0 1 1 0 0 1 0 0 1 0 1 1 0 0 0 0 0 0 1 1 1
0 1 1 1 0 1 1 1 1 0 1 1 1 0 0 0 1 1 0 0 1 0 0 1 0 1 1 0 0 0 0 0
0 0 0 0 0 1 1 1 0 1 1 1 1 0 1 1 1 0 0 0 1 1 0 0 1 0 0 1 0 1 1 0
0 1 1 0 0 0 0 0 0 1 1 1 0 1 1 1 1 0 1 1 1 0 0 0 1 1 0 0 1 0 0 1
1 0 0 1 0 1 1 0 0 0 0 0 0 1 1 1 0 1 1 1 1 0 1 1 1 0 0 0 1 1 0 0
1 1 0 0 1 0 0 1 0 1 1 0 0 0 0 0 0 1 1 1 0 1 1 1 1 0 1 1 1 0 0 0
CC2480 Data Sheet SWRS074
Page 30 of 43
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