CDA EVM9 Manuale Utente Scaricare il pdf (Pagina 18)

Incremental Redundancy – Example using MCS-9

• The original data is 1/3 coded and then punctured in three ways. The

first TX is sent if in error 2nd is sent and combined with the first

increasing redundancy and so on with the third, by which time the 1/3

redundancy is reproduced

Rate 1/3

coded data

R = 1/1

Original data

decode attempt

R = 1/1

R = 1/2

R = 1/3

decode attempt

Incremental Redundancy

– Retransmission using different coding Schemes

•In EGPRS it is possible for data to be retransmitted using a

different coding Scheme.

•These retransmissions must use coding schemes from the same

family

•There will be segmentation between coding schemes of same

family

• When using MCS-8 it is necessary to add padding to data, as

padding is added before the channel coding incremental

redundancy recombining is not possible

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 45 46

Nessun commento

CDA EVM9 Manuale Utente Pagina 18