Coded Packet Combining for Reliable Return-Channel-Free Reception
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Solution Overview
Problem
In unidirectional multipoint-to-point transmission systems, the interference and unpredictable reception quality at the receiver due to random transmission times of multiple transmitters pose challenges in decoding payload data efficiently and reliably, especially in systems without a return channel.
Innovation Solution
The system generates and transmits multiple channel-coded data packets with varying redundancy information, allowing the receiver to decode individual packets or combine them for increased redundancy and code gain, even under poor signal conditions, without requiring a return channel for retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple transmitters send data packets with random transmission times, then transmission efficiency and battery life are improved, but reception quality and decoding reliability deteriorate due to interference
Solution Approach 1:
The transmitter segments the payload data into multiple coded data packets with different redundancy levels and transmits them at different times. This segmentation allows the receiver to combine packets to overcome interference while maintaining transmission efficiency through random timing.
Solution Approach 2:
The transmitter preliminarily encodes the data packets with varying redundancy information before transmission. This preliminary coding action enables the receiver to successfully decode data by combining packets even when reception quality is poor, resolving the reliability issue.
2Reliability
If channel-coded data packets with varying redundancy are transmitted, then decoding reliability under poor signal conditions is improved, but transmission complexity increases
Solution Approach 1:
The system changes the redundancy parameter of coded data packets based on channel conditions. By varying the redundancy level in different packets, the system achieves reliable decoding under poor signal conditions while keeping the transmission protocol relatively simple through parameter adaptation.
3Reliability
If code combining is used to achieve coding gain, then transmission range and reliability are improved, but signal-to-noise ratio requirements increase
Solution Approach 1:
The transmitter sends multiple packets with partial redundancy information rather than transmitting the complete data with full redundancy once. This partial action approach allows the receiver to combine packets to achieve the necessary coding gain, improving transmission range while reducing the SNR requirement for each individual packet.
Data Source
AI summary
Concept for transmitting payload data from a transmitter to a receiver via a communication channel within a time interval, wherein channel-coded data packets are generated from the payload data, wherein each of the channel-coded data packets has packet core data corresponding to a packet identification of the respective channel-coded data packet, and wherein the packet core data is coded with a channel code of higher redundancy than the payload data. The channel-coded data packets are sent without any return channel to the receiver, which decodes packet core data of a first received channel-coded data packet of the time interval. If error-free decoding of the first channel-coded data packet fails, packet core data of at least one second received channel-coded data packet of the time interval are decoded to determine a suitable further channel-coded data packet for combination with the first channel-coded data packet to acquire, on account of the combination, an increased code gain for decoding of the payload data.