Rate Mapping for SISO, AWGN channel

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Presentation transcript:

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

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.

Simulink model

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

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”. IEEE802.16-REVd/D5

Simulation results

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

Simulation & Theoretical

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