IEEE 802.11 DSSS PHY
Characteristics:
•	2.4 GHz ISM band (FCC 15.247)
•	1 and 2 Mbit/s datarate (DBPSK and DQPSK modulation)
•	> 10 dB processing gain
•	spreading sequence 11 chip Barker sequence
Operating frequency range
•	2.4 to 2.4835 GHz
•	11 overlapping channels with centerfrequencies from 2412 MHz to 2462 MHz with 5 MHz spacing
Spreading sequence
•	Each symbol is spreaded with 11 chip Barker sequence
•	+1, -1, +1, +1, -1, +1, +1, +1, -1, -1, -1
•	chipping rate 11 MHz
•	Chipping rate of 11 MHz over 1 MHz symbols gives a processing gain of theoretical 10.4 dB
Datarates and Modulation
•	1 Mbit/s Differential Binary Phase Shift Keying
•	2 Mbit/s Differential Quadrature Phase Shift Keying
•	Symbol rate is 1 MHz.
Encoding tables
Scrambler
•	All bits are being scrambled with:

Transmit Power level
•	The maximum allowable output power is 1000mW according to FCC 15.247
Transmit Spectrum Mask
 
 Spurious Emissions
•	The DSSS PHY shall conform with in-band and out of band spurious emissions  as set by regulatory bodies
•	For USA: refer to FCC 15.247, FCC 15.205 and FCC 15.209
Antenna Gain
•	Not defined in standard, but should be conform FCC 15.247
Carrier suppression
•	Carrier suppresion shall be at least 15 dB below the peak sin(x)/x power spectrum