Symbol Repetition Coding for Phase Noise Resilience

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Solution Overview

Problem

Current digital communication systems face reliability challenges due to phase variations, especially at high transmission frequencies beyond GigaHertz, where imperfections in oscillators and limited quantization bits result in a lower signal-to-noise ratio, necessitating a method that addresses these constraints effectively.

Innovation Solution

The method involves repeating symbols before multi-carrier modulation and using a polar constellation with configurable pitch to enhance resilience against phase variations, allowing for flexible adaptation to noise conditions without modifying the energy or spectrum of the multi-carrier signal, and incorporating a demodulation process that estimates and corrects phase errors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If high transmission frequencies beyond GigaHertz are used, then data transmission rate is improved, but phase variations and noise increase reducing reliability

Engineering Contradiction:

Improvedata transmission rateVSAvoidtransmission reliability

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The transmission is divided into multiple OFDM symbols, each carrying segmented portions of the data. This segmentation allows the system to process and transmit data in manageable units that can be individually protected against phase variations through the polar constellation mapping, thereby maintaining reliability at high frequencies.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs a composite modulation scheme combining OFDM multi-carrier modulation with polar constellation mapping. This composite approach integrates the spectral efficiency of OFDM with the phase variation resilience of polar constellations, creating a hybrid system that achieves both high data rates and reliable transmission in high-frequency bands.

Inventive Principle:

Principle #40Composite materials

2Productivity

If high modulation orders are used, then data rate is increased, but resistance to channel disturbances decreases

Engineering Contradiction:

Improvedata rateVSAvoidresistance to channel disturbances

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent changes the fundamental parameter of constellation geometry from traditional QAM to polar constellation. This parameter change allows the system to maintain high modulation orders for increased data rates while the polar geometry inherently provides better resistance to phase variations and channel disturbances, resolving the trade-off between productivity and reliability.

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If oscillators with limited quantization bits are used, then device complexity is reduced, but signal-to-noise ratio decreases

Engineering Contradiction:

Improveoscillator complexityVSAvoidsignal-to-noise ratio

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent converts the harmful effect of limited quantization bits and resulting phase noise into a beneficial situation by using polar constellation mapping. The polar geometry's inherent robustness to phase variations transforms the noise introduced by simple oscillators into a manageable parameter, allowing low-complexity hardware to achieve reliable transmission without requiring high-precision oscillators.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS12177056B2Method for telecommunication with symbol binary repetition coding and corresponding devices

Publication Date: 2024.12.24 ORANGE SA

AI summary

A telecommunication method which includes: mapping, with a mapper, input data to points of a constellation in order to generate symbols, repeating symbols according to a pattern, modulating the symbols, with a modulator, in order to generate multi-carrier symbols, and transmitting a radio signal representative of the multi-carrier symbols.