Abstract:

A novel low density parity check (LDPC) based adaptive hybrid automatic retransmission request (HARQ) method is proposed. A few mother LDPC codes with different code rates can be used for the automatic modulation coding-HARQ procession. When the channel is bad, e.g, the SNR is low, the low-code-rate mother LDPC code is chosen, and the parity-puncturing HARQ should be used for the retransmission. When the channel is good, e.g., the SNR is high, the high-code-rate mother LDPC is selected, and the data-puncturing HARQ should be utilized. This method can improve the efficiency of hardware implementation, save energy consumption, and ensure a good performance even when the channel is very bad.