Patent ID: 8031785

Claim:
A transmission method for use in a multi-band OFDM wideband system, the method comprising the steps of: interleaving bits within a frame of source data using a first interleave pattern prior to transmitting; mapping symbols within the frame of source data to a first plurality of tones using a first mapping; transmitting the frame of source data mapped using the first mapping; interleaving the bits within the frame of source data using a second interleave pattern prior to retransmitting; mapping the symbols within the frame of source data to a second plurality of tones using a second mapping; and retransmitting the frame of source data using the second mapping; wherein frequency spreading for the frame of source data is improved through the use of the first and second mappings; and wherein the mapping steps are performed in accordance with the operation: z n = { y n transmission y n + iM ⁡ ( mod ⁡ ( N ) ) retransmission ⁢ ⁢ n = 1 , 2 , … ⁢ , N wherein i is the number of retransmission, M is the offset of a start symbol, N is the total number of symbols in the frame, y n are the symbols and z n are the first and second plurality of the tones to which the symbols are mapped.