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).
Best
regards,
Ambroise
Popper
tel : +33 1 44 89 48
11
cell : +33 6 60 63 57 20
SEQUANS
Communications
101-103 bld Mc Donald, 75019 Paris, France
tel : +33 1 44 89 48
07
fax : +33 1 44 89 48 06
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