A method of concatenation for LDPC encoding in an OFDM wireless system
selects codewords based on the data packet payload size, wherein the
payload size is the number of transmitted information bits in octets. For
low transmission rates, shortening and puncturing across all codewords
within the packet is applied to minimize OFDM symbol padding. For high
transmission rates, only shortening across all codewords within the
packet is applied to minimize OFDM symbol padding.