Noncoherent Peaky Waveform Retransmission With NACK-Based Codeblock Recovery
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Solution Overview
Problem
Noncoherent peaky waveforms in wireless communication systems face challenges in error performance due to the need for retransmission mechanisms that are not straightforward, especially in scenarios with low energy devices and unique waveform characteristics, leading to deteriorated communication reliability and efficiency.
Innovation Solution
Implementing retransmission mechanisms for noncoherent peaky waveforms by multiplexing message data with redundancy bits on a per-message or per-symbol basis, transmitting in different subsets of assigned subcarriers according to a duty cycle, and performing error detection/correction, with feedback-based retransmission when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If retransmission mechanisms are implemented for noncoherent peaky waveforms, then communication reliability is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The message data is segmented into multiple codeblocks, each with its own CRC check. This allows selective retransmission of only failed codeblocks rather than retransmitting entire messages, improving reliability while reducing the complexity and overhead of retransmission mechanisms.
Solution Approach 2:
A feedback mechanism is implemented where the receiving node sends NACK feedback for failed codeblocks. This enables targeted retransmission based on actual error conditions, improving communication reliability without requiring complex omnibus retransmission protocols.
2Reliability
If retransmission mechanisms are implemented for noncoherent peaky waveforms, then communication reliability is improved, but signaling overhead increases
Solution Approach 1:
By segmenting messages into codeblocks with individual CRC checks, the system can identify and request retransmission of only specific failed blocks. This reduces signaling overhead compared to retransmitting entire messages, while maintaining improved reliability through targeted error correction.
Solution Approach 2:
The system performs partial retransmission of only the necessary codeblocks that failed CRC checks, rather than retransmitting complete messages. This partial action approach reduces signaling overhead while achieving the reliability improvement needed for noncoherent peaky waveforms.
3Use of energy by moving object
If noncoherent peaky waveforms are used for low-energy devices, then energy efficiency is improved, but error performance deteriorates
Solution Approach 1:
CRC check bits are preliminarily attached to each codeblock before transmission. This preliminary error detection capability allows the receiving node to identify failed transmissions and request retransmission, thereby improving error performance while maintaining the energy efficiency of noncoherent peaky waveforms for low-energy devices.
Solution Approach 2:
A feedback mechanism using NACK signals enables the receiving node to inform the transmitting node about failed codeblocks. This feedback loop improves error performance by enabling selective retransmission, while the overall system maintains energy efficiency by using noncoherent peaky waveforms and only retransmitting when necessary.
Data Source
AI summary
Aspects described herein relate to transmitting noncoherent peaky waveforms including 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. Other aspects relate to receiving the multiplexed data transmissions, sending the NACK feedback, and receiving retransmissions of the multiplexed data.