Soft Modulation for Reliable Data Forwarding
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Solution Overview
Problem
The conventional data forwarding method (DF) in communication systems reduces forwarding performance when a forwarding node incorrectly decodes data from a previous sending node, as it prevents the forwarding of data.
Innovation Solution
Implementing a data sending method that uses soft modulation to generate modulation symbols, allowing forwarding nodes to still forward data even if they incorrectly decode the previous data, thereby improving forwarding performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If decoding forwarding (DF) manner is used, then data forwarding is simple and reliable for correct decoding, but forwarding performance deteriorates when decoding is incorrect
Solution Approach 1:
The patent changes the parameter of modulation from hard modulation (binary symbols) to soft modulation (continuous values with reliability information). This allows the forwarding node to forward data based on soft decisions rather than hard decoding results, thereby maintaining forwarding performance even when decoding is incorrect. The soft modulation symbol includes both the modulated value and reliability information, enabling the receiving node to make informed decisions about data validity.
2Ease of operation
If hard modulation is used for data transmission, then implementation is simple, but forwarding nodes cannot forward data after incorrect decoding
Solution Approach 1:
The patent applies preliminary action by incorporating reliability information into the modulation process itself. Instead of waiting for decoding to determine whether to forward data, the soft modulation symbol pre-provides reliability metrics that enable the receiving node to assess data quality before forwarding. This preliminary inclusion of reliability information allows the system to maintain forwarding capability even when decoding fails, as the reliability information guides subsequent forwarding decisions.
3Reliability
If conventional decoding forwarding is used, then error correction is straightforward for correct packets, but block error rates increase and multi-hop forwarding fails
Solution Approach 1:
The patent introduces reliability information as an intermediary element between the modulation and decoding processes. This intermediary allows each node in the communication chain to assess the quality of received data and make informed forwarding decisions. The reliability information acts as a mediator that enables multi-hop forwarding by allowing nodes to trust soft decisions from previous hops, thereby extending the data transmission range and reducing block error rates even when decoding is not perfectly accurate.
Data Source
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Figure 3B~3D
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AI summary
This application provides a data sending method and an apparatus. The method includes: performing, by a node, soft modulation to generate a modulation symbol; preprocessing, by the node, the modulation symbol to obtain to-be-sent data, where the preprocessing includes one or more of layer mapping, antenna port mapping, precoding, or transform precoding; and mapping, by the node, the to-be-sent data to a physical resource, and sending the to-be-sent data on the physical resource. According to provided embodiments, when a forwarding node incorrectly decodes data of a previous sending node, the data can still be forwarded, thereby improving forwarding performance.