Siemens IEEE802.11 - Manual (Page 21)

, © Siemens, 2002
11 chips
1 bit period
11 chips 1 bit
period
Data
PRN
Out
11 Bit Barker Code (PRN*)
0100100011110110111000
Transmitter baseband signal after spreading
Transmitter baseband signal before spreading
Receiver baseband signal after matched filter (De-spread)
Receiver baseband signal before matched filter (Correlator)
RF Energy is Spread by XOR of Data with PRN Sequence
Signal
Spectrum
1 0
1011011100010110111000
* PRN: Pseudorandom Number
Direct Sequence Spread Spectrum