文档介绍：WLAN
OFDM Transceiver
Algorithm,
Architecture
and Simulation Results
Chia-Sheng Peng
2001/11/22
IEEE Transmitter
TWT ***@NCTU
OFDM Transmitter Architecture
FEC Inter- QAM Pilots and
Coding leaving Mapping Zeros Adding
Guard Interpolation
IFFT Windowing Waveform
interval Shaping
40MHz, Up
10-b DAC LPF Converter PA
3
TWT ***@NCTU
WLAN Tx PLCP
n Contains Preamble, SIGNAL and DATA
fields
Header
RATE Reserved LENGTH Parity Tail SERVICE PSDU Tail Pad Bits
4 bits 1bits 12 bits 1 bit 6 bits 16 bits 6 bits
PLCP Preamble SIGNAL DATA
12 Symbols One OFDM Symbol Variable Number of OFDM Symbols
4
TWT ***@NCTU
WLAN Tx PLCP simulation
EqnVar VAR
VAR1
Num_DataField_bits=8064
coding_rate=3/4
DF
mod_type=4 Preamble
DF ReadFile
DefaultNumericStart=0 R4
DefaultNumericStop=6400 FileName="D:\users\jow\WLAN_OFDM_prj\data\personal\ADS_preamblet_(320-Img-OK).re"
DefaultTimeStart=0 usec ControlSimulation=NO
DefaultTimeStop=500 usec OutputType=periodic
RectToCx
R6
ReadFile
R5
FileName="D:\users\jow\WLAN_OFDM_prj\data\personal\ADS_preamblet_(320-Re-OK).re"
ControlSimulation=NO
Signal OutputType=periodic
Polarity
Q_out
input output input
I_out Pilot_polarity
P2
ReadFile conv_conder Interleaver Mod_map RectToCx Num_symbols=Num_DataField_bits/48/mod_type/coding_rate+1
R8 X1 I2 M2 R9
FileName="D:\users\jow\WLAN_OFDM_prj\data\personal\"Type=1 Type=1 input output
ControlSimulation=NO
OutputType=periodic
GIwindow
G1
sign A
A output Num_in=64 out
out input B
B Num_GI=16
FFT_Cx CxToRect Pre_temp=0
Pilot_insert F1 C2 Circulator NumericSink
Circulator P1 RectToCx C3 N1
C1 Order=6 R3
ALength=320
ALength=48 Size=64
BLength=48*(Num_DataField_bits/coding_rate/48/mod_type)Direction=Inverse input output
WaveForm
W1 GIwindow
Value="1 0 1 1 1 0 1" G2
ControlSimulation=NO Data Num_in=64
Periodic=YES Num_GI=16
Period=0 Pre_temp=
initial