Methods and systems for selective interleaving in retransmissions and iterative demodulation of modulated signals with different interleaving

A method for demodulation of a message comprising:

• receiving a first copy of the message to provide a first set of symbols associated with the message and a second copy of the message to provide a second set of symbols, the first copy being associated with a first interleaving pattern and the second copy being associated with a second interleaving pattern different from the first interleaving pattern;
• and
• iteratively demodulating the first set of symbols and the second set of symbols using extrinsic information associated with the first set of symbols for demodulation of the second set of symbols to provide a set of symbol estimates for the message.

A system for interleaving in a retransmission based communication system comprising:

• a receiver that receives a first copy of a message to provide a first set of symbols associated with the message and a second copy of the message to provide a second set of symbols associated with the message, the first copy being associated with a first one of a plurality of interleaving protocols and the second copy being associated with a second one of the plurality of interleaving protocols different from the first one of the plurality of interleaving protocols;
• and
• an iterative demodulator that demodulates the first set of symbols and the second set of symbols using extrinsic information associated with the first set of symbols for demodulation of the second set of symbols to provide a set of symbol estimates for the message.

A system for iterative demodulation of a message comprising:

• means for receiving a first copy of the message to provide a first set of symbols associated with the message and a second copy of the message to provide a second set of symbols, the first copy being associated with a first interleaving pattern and the second copy being associated with a second interleaving pattern different from the first interleaving pattern;
• and
• means for iteratively demodulating the first set of symbols and the second set of symbols using extrinsic information associated with the first set of symbols for demodulation of the second set of symbols and extrinsic information associated with the second set of symbols for demodulation of the first set of symbols to provide a set of symbol estimates for the message.