Communication transmitter for retransmitting medium access control (mac) protocol data unit (mpdu)

A method of operating a communication receiver for receiving a retransmitted medium access control (MAC) protocol data unit (MPDU) from a communication transmitter over a communication channel using a hybrid automatic repeat request (HARQ) retransmission scheme, the retransmitted MPDU comprising a plurality of information bits, the retransmitted MPDU being associated with a previously received MPDU, the communication receiver comprising a communication interface and a processor, the method comprising:

• transmitting, by the communication interface, a block acknowledgement (Block ACK) frame to the communication transmitter, the Block ACK frame indicating previously correctly decoded MPDUs at the communication receiver;
• receiving, by the communication interface, a bit sequence from the communication transmitter, wherein the bit sequence comprises the plurality of information bits;
• determining, by the processor, a plurality of log-likelihood ratios (LLRs) associated with the plurality of information bits;
• and
• combining, by the processor, the determined plurality of LLRs with a previously determined plurality of LLRs associated with the previously received MPDU.