1. Frequency Repetition with CTC
March 2007
doc.: IEEE yy/xxxxr0
July 2007
Frequency Repetition with CTC
IEEE P Wireless RANs Date:
Authors:
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Carlos de Segovia, France Telecom
Patrick Pirat, France Telecom

2. Simulation environment for synching
March 2007
doc.: IEEE yy/xxxxr0
July 2007
Simulation environment for synching
Downlink
FFT size : 2048
Guard sub-carriers: 184 on the left side, 183 on the right side
DC sub-carrier: 1
Pilots: 240
Data sub-carriers: 1440
Sub-channel size: 24 data symbols
Coded Block size: 576
Channel coding: CTC Turbo Codes and Convolutional Coding
Repetition in the Frequency domain
Channel model: Profile B with Doppler
Further details described in document
Carlos de Segovia, France Telecom
Patrick Pirat, France Telecom

3. Stage 1: Simulation results match! Convolutional Code, R=1/2 QPSK
March 2007
doc.: IEEE yy/xxxxr0
July 2007
Stage 1: Simulation results match! Convolutional Code, R=1/2 QPSK
Carlos de Segovia, France Telecom
Patrick Pirat, France Telecom

4. Stage 2: Frequency Repetition
March 2007
doc.: IEEE yy/xxxxr0
July 2007
Stage 2: Frequency Repetition
The 576 bits of a block are allocated to 12OFDM symbols when QPSK
Frequency diversity: Data is repeted into adjacent sub-channels
Classical Maximum Ratio Combining at the receiver
Symbols to map on the Sub-Channel
Encoder
Puncturer
Bit Interleaver
QAM
Mapper
Symbols to map on the adjacent-Subcannel t
No repetition: R=1/2 f t
2x repetition: R=1/4 f
Carlos de Segovia, France Telecom
Patrick Pirat, France Telecom

5. Block in a single Sub-channel
March 2007
doc.: IEEE yy/xxxxr0
July 2007
Block in a single Sub-channel
The 576 bits of a block are allocated to 12OFDM symbols when QPSK t f
4x repetition: R=1/8 t f
6x repetition: R=1/12
Carlos de Segovia, France Telecom
Patrick Pirat, France Telecom

6. Simulation Results July 2007 March 2007 doc.: IEEE 802.22-yy/xxxxr0
Carlos de Segovia, France Telecom
Patrick Pirat, France Telecom

7. July 2007 March 2007 doc.: IEEE 802.22-yy/xxxxr0
Carlos de Segovia, France Telecom
Patrick Pirat, France Telecom

8. March 2007
doc.: IEEE yy/xxxxr0
July 2007
Conclusion
Frequency repetition provides strong gain for the WRAN system
Can be used to protect headers and data information
The WRAN operator can dynamically adjust the repetition to increase range (Rx2, Rx4, Rx6)
Carlos de Segovia, France Telecom
Patrick Pirat, France Telecom