Wireless Packet Error Correction Using Soft-Bit Retransmission
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Solution Overview
Problem
Existing wireless communication systems require a large number of retransmissions to achieve a desired bit error rate, leading to increased delay and power consumption, especially in delay-sensitive applications like real-time audio or video links.
Innovation Solution
The system employs a method where the receiver generates accumulated packets from multiple corrupted packets to create a decision packet, reducing the number of retransmissions needed by combining soft bits and using a CRC syndrome table for error correction, thereby achieving a desired bit error rate with fewer retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large number of retransmissions are used to achieve a desired bit error rate, then reliability is improved, but delay and power consumption increase
Solution Approach 1:
The receiver performs preliminary error detection and correction operations on each received packet before deciding whether to request retransmission. By using CRC checks and soft bit accumulation in advance, the system can identify and correct errors without requiring multiple retransmissions, thus reducing delay while maintaining reliability
Solution Approach 2:
The patent introduces soft bits as an intermediary representation of packet data. Instead of directly comparing hard binary decisions, the system accumulates soft bit values from multiple transmissions and uses these accumulated values to make more reliable decoding decisions, reducing the number of retransmissions needed
2Reliability
If a large number of retransmissions are used to achieve a desired bit error rate, then reliability is improved, but power consumption increases
Solution Approach 1:
The receiver performs preliminary error detection and correction operations on each received packet before deciding whether to request retransmission. By using CRC checks and soft bit accumulation in advance, the system can identify and correct errors without requiring multiple retransmissions, thus reducing power consumption while maintaining reliability
Solution Approach 2:
The system implements feedback mechanisms where the receiver sends acknowledgments or negative acknowledgments based on error detection results. This feedback allows the transmitter to adjust transmission strategies and avoid unnecessary retransmissions, optimizing power consumption while ensuring reliable delivery
3Device complexity
If simple error detection methods are used, then device complexity is reduced, but the number of retransmissions increases
Solution Approach 1:
The patent segments the error correction process into distinct stages: initial CRC-based error detection, soft bit accumulation, and conditional retransmission. This segmentation allows the system to use simple methods when possible while reserving more complex operations for cases where they are truly needed, balancing complexity and reliability
Solution Approach 2:
The system performs partial error correction by accumulating soft bits from a limited number of transmissions and using CRC checks on selected packets. This partial action approach achieves sufficient reliability for many cases without implementing full error correction on every packet, thus managing device complexity effectively
Data Source
AI summary
Systems, methods, and apparatus receive a corrupted packet of an original packet and at least one corrupted retransmitted packet of the original packet and generate a decision packet for the original packet based on identical bits of the original packet received through the corrupted packet and the at least one corrupted retransmitted packet. Embodiments verify the decision packet to determine whether the decision packet is correct based on a last one of the at least one corrupted retransmitted packet and a one or more cyclic redundancy check (CRC) operations.