DVB-S2 short format use

Good morning,

Matlab does include a function, named 'dvbs2ldpc', to construct a parity check matrix to be used in DVB-S2 standard. However this standard counts with two different modes, depending on the size of this parity check matrix, SHORT and NORMAL, and this function only applies for the lattest one.

I am trying to build up a function to be used for SHORT transmission mode, and it seems that something must be wrong with it, as its BER results are so good compared to the NORMAL mode ones.

Please find attached a zip folder with two scripts, dvbs2ldpcShort, which constructs the parity check matrix, and LDPC, which uses this matrix to perform BER simulations. These can be compared with the normal ones appearing in the example appearing after typing 'help comm.LDPCDecoder' in Matlab terminal.

Many thanks in advance, and best regards. If you have any questions, do not hesitate to contact me.