Collision-Resistant Modulation for 5G Message Recovery
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Solution Overview
Problem
Wireless receivers face challenges in demodulating messages when two messages collide, resulting in complex superposition signals that are incomprehensible, necessitating a method to recover the original message from such interference.
Innovation Solution
A wireless receiver measures amplitude and phase values of message elements and compares them to predetermined modulation states, categorizing them as legal, unambiguous, ambiguous, or incompatible, allowing for demodulation even when messages collide, by using a modulation scheme where no state equals the superposition of two other states, enabling unambiguous or multiple possible demodulation scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If two wireless messages are transmitted on the same frequency at the same time, then communication efficiency is improved, but signal collision occurs producing incomprehensible superposition signals
Solution Approach 1:
The patent changes the modulation parameters by using a restricted set of modulation states where no state equals the superposition of two other states. This parameter restriction enables the receiver to distinguish between single-message and collided-message scenarios, allowing recovery of original messages even when transmissions collide on the same frequency.
Solution Approach 2:
The patent converts the harmful effect of signal collision into a beneficial feature by using the collision information itself to identify and recover messages. The receiver measures amplitude and phase values, compares them to predetermined modulation states, and categorizes message elements as legal, unambiguous, ambiguous, or incompatible, enabling successful demodulation despite collisions.
2Device complexity
If conventional modulation schemes are used, then device complexity is reduced, but message recovery from collisions becomes impossible
Solution Approach 1:
The patent modifies the modulation scheme parameters to use a restricted set of states with specific mathematical properties (no state equals superposition of two others). This change enables collision detection and message recovery while maintaining relatively simple amplitude and phase measurements at the receiver.
Solution Approach 2:
The patent creates a simplified model of the modulation states and their superposition relationships, allowing the receiver to copy and compare measured amplitude-phase values against predetermined states to identify collisions and recover messages without complex processing.
3Reliability
If message retransmission is used to handle collisions, then message accuracy is improved, but time and energy consumption increase
Solution Approach 1:
The patent converts the collision event from a complete failure requiring retransmission into a recoverable condition. By measuring amplitude and phase values and comparing them to predetermined modulation states, the receiver can identify collided message elements and recover them directly, eliminating the need for retransmission and reducing time loss.
Solution Approach 2:
The receiver performs self-service by autonomously detecting and recovering collided messages using the restricted modulation state properties. The system uses the received signal information itself to identify and resolve collisions without external intervention or retransmission requests.
Data Source
AI summary
When two different messages are transmitted at the same time in 5G or 6G, the message is “collided”. The resulting interference causes a message fault, necessitating a costly retransmission. Disclosed is a modulation scheme in which the modulation states are configured so that a message element can be collided by an intruder message, yet the receiver can still recover the original message element. In other cases, depending on the colliding states, the receiver can narrow the possible values of each faulted message element to just two or three possibilities, thereby greatly reducing the amount of time required for testing each combination against an error-detection code. Especially under high-noise conditions, the collision-proof modulation scheme may enable enhanced throughput by identifying and mitigating the faulted message element, and may thereby avoid unnecessary retransmissions.