Reference Signaling Time Phase Shift for PAPR Reduction

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Solution Overview

Problem

In modern wireless communication systems, multi-antenna technologies for 5G networks face challenges with power peaks and changes in power during multi-layer transmissions, leading to increased demands on transmission and reception systems, particularly in terms of linearity requirements for power amplifiers.

Innovation Solution

The method involves shifting reference signaling in time and/or phase across multiple layers in the same symbol time interval using a signaling radio node with an antenna arrangement, applying a small cyclic time shift or frequency-dependent phase rotation to reduce Peak-to-Average Power Ratio (PAPR) and Cubic Metric (CM), allowing for more efficient use of radio and antenna circuitry.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If reference signaling is transmitted on multiple layers simultaneously using the same antenna elements, then multi-layer transmission capability is improved, but power peaks and PAPR increase leading to higher linearity demands on power amplifiers

Engineering Contradiction:

Improvemulti-layer transmission capabilityVSAvoidpower peaks and PAPR

Core Design Contradiction:

Adaptability or versatilityVSPower

Solution Approach 1:

The patent applies cyclic time shifts and frequency-dependent phase rotations to reference signaling parameters across different layers. By modifying the time and phase parameters of reference signals on different layers, the patent reduces power peaks and PAPR while maintaining multi-layer transmission capability, thereby resolving the contradiction between adaptability and power efficiency

Inventive Principle:

Principle #35Parameter changes

2Productivity

If reference signaling on multiple layers is transmitted in the same symbol time interval, then transmission efficiency is improved, but demands on circuitry linearity increase

Engineering Contradiction:

Improvetransmission efficiencyVSAvoidcircuitry linearity demands

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent modifies reference signal parameters by applying cyclic time shifts and phase rotations across different layers within the same symbol time interval. This allows efficient multi-layer transmission while reducing the linearity demands on power amplifiers and other circuitry, thus resolving the contradiction between productivity and reliability

Inventive Principle:

Principle #35Parameter changes

3Reliability

If higher linearity requirements are imposed on power amplifiers to handle power peaks, then transmission reliability is improved, but system cost and complexity increase

Engineering Contradiction:

Improvetransmission reliabilityVSAvoidsystem cost and complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent converts the harmful effect of power peaks and high PAPR into a benefit by applying cyclic time shifts and phase rotations that naturally reduce these peaks. This approach improves transmission reliability while avoiding the need for expensive high-linearity power amplifiers, thereby resolving the contradiction between reliability and device complexity

Inventive Principle:

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

Data Source

PatentUS11616616B2Reference signaling for radio access networks

Publication Date: 2023.03.28 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

There is disclosed a method of operating a signaling radio node in a radio access network, the signaling radio node being adapted for transmitting on a plurality of layers utilizing an antenna arrangement; wherein the method comprises transmitting, on each of the plurality of layers, reference signaling in the same symbol time interval, wherein reference signaling on at least a first layer of the plurality of layers is shifted in time and/or phase relative to reference signaling on at least a second layer of the plurality of layers.There are also disclosed related methods and devices.