1. Rate Mapping for SISO, AWGN channel
Mohamad Charafeddine 29th April 2005

2. WirelessMAN-OFDM Block Diagram
FEC
Reed Solomon / Convolutional Coding (RS-CC)
Block Turbo Coding (BTC) optional
Convolutional Turbo Codes (CTC) optional
Interleaver
Randomization
Modulation
256-IFFT
RF Transmitter
Bernoulli binary generator
Channel
De-interleaver
De-Randomization
Demodulation
256-FFT
RF Receiver
Channel Decoder
Data Received x x
RS encoding is not employed when subchannelization is adopted.

3. Simulink model

4. FEC: CC & Puncturing CC Rate ½ is used: (171, 133)
For Puncturing, the following table is used:

5. FEC: Rates table Channel coding summary table shown below:
“When subchannelization is applied in the uplink, the FEC shall bypass the RS encoder and use the Overall Coding Rate … as CC code Rate”. IEEE REVd/D5

6. Simulation results

7. Theoretical approach For SQ QAM:
Note: Due to the nearest neighbors approximation, the above holds as the SNR gets higher
Coding gain is defined as:
where

8. Simulation & Theoretical

9. Spectral Efficiency Vs SNR, for BER = 1e-3