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[STDS-802-16] turbo-codes and subchannelization



In the 802.16-2004 OFDM PHY, turbo-codes have been extended to support uplink subchannelization. A minimum block size is defined both in BTC (96 bits) and CTC (48 bits).
How do you accomodate this with the use of a small number of subchannels?
A first interpretation would be that you cannot use turbo-codes with a small number of subchannels (for instance in BTC QPSK 1/2, you can only support 4 or 8 subchannels to reach the minimum block size of 96 bits).
A second interpretation is that you must code over several OFDM symbols to reach desired block size (for instance in BTC QPSK 1/2 with one used subchannel, a coded block is necessarily a multiple of 4 symbols).
 
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Ambroise Popper
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SEQUANS Communications
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