Techniques for retransmitting noncoherent peaky waveforms in wireless communications

An apparatus for wireless communication, comprising:

• a transceiver;
• one or more memories configured to, individually or in combination, store instructions;
• and
• one or more processors communicatively coupled with the one or more memories, wherein the one or more processors are, individually or in combination, configured to execute the instructions to cause the apparatus to:
• receive, from a transmitting node, message data and redundancy bits multiplexed in a different subset of assigned subcarriers in each of multiple symbols of a noncoherent transmission according to a duty cycle;
• perform a cyclic redundancy check (CRC) or forward error correction (FEC) for at least a portion of the message data or redundancy bits;
• transmit, to the transmitting node, a negative-acknowledgement (NACK) feedback for at least the portion of the message data or redundancy bits;
• and
• receive, from the transmitting node and based on transmitting the NACK feedback, a retransmission of at least the portion of the message data or redundancy bits.

A method for wireless communication at a transmitting node, comprising:

• multiplexing message data, to be transmitted to a receiving node, with redundancy bits on a per-message or per-symbol basis;
• transmitting, to the receiving node, the multiplexed message data and redundancy bits in a different subset of assigned subcarriers in each of multiple symbols of a noncoherent transmission according to a duty cycle;
• receiving, from the receiving node, a negative-acknowledgement (NACK) feedback for at least a portion of the message data or redundancy bits;
• and
• retransmitting, to the receiving node and based on receiving the NACK feedback, at least the portion of the message data or redundancy bits.

A method for wireless communication at a receiving node, comprising:

• receiving, from a transmitting node, message data and redundancy bits multiplexed in a different subset of assigned subcarriers in each of multiple symbols of a noncoherent transmission according to a duty cycle;
• performing a cyclic redundancy check (CRC) or forward error correction (FEC) for at least a portion of the message data or redundancy bits;
• transmitting, to the transmitting node, a negative-acknowledgement (NACK) feedback for at least the portion of the message data or redundancy bits;
• and
• receiving, from the transmitting node and based on transmitting the NACK feedback, a retransmission of at least the portion of the message data or redundancy bits.