DFT-s-OFDM Downlink Resource Offset for Lower PAPR

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Solution Overview

Problem

The application of OFDM in downlink communication in high-frequency bands, such as the terahertz band, leads to an increase in peak-to-average power ratio (PAPR), which affects signal transmission quality, and there is a need to address this issue while supporting advanced mobile communication requirements like high data rates and low latency.

Innovation Solution

Applying a data allocation offset to resources in DFT-s-OFDM symbols, followed by inverse fast Fourier transform and adding a cyclic prefix, to minimize PAPR and prevent phase distortion in downlink signals.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If OFDM is applied to downlink in high frequency band, then data transmission capability is improved, but peak-to-average power ratio increases

Engineering Contradiction:

Improvedata transmission capabilityVSAvoidpeak-to-average power ratio

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent applies DFT-spread processing to modify the signal parameters before OFDM modulation, transforming the conventional OFDM signal into a DFT-s-OFDM signal with reduced peak-to-average power ratio while maintaining downlink data transmission capability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent divides the downlink data into multiple resource blocks and applies DFT-spread processing to each segment independently, then combines them through OFDM modulation to achieve both high data rate and low PAPR

Inventive Principle:

Principle #1Segmentation

2Object-generated harmful factors

If DFT-s-OFDM is applied to downlink to reduce PAPR, then peak-to-average power ratio is reduced, but phase tracking-reference signal configuration may be distorted

Engineering Contradiction:

Improvepeak-to-average power ratioVSAvoidphase tracking-reference signal configuration

Core Design Contradiction:

Object-generated harmful factorsVSReliability

Solution Approach 1:

The patent applies different processing to different signal components: DFT-spread processing is applied to data signals to reduce PAPR, while phase tracking reference signals are configured with specific properties to maintain their phase accuracy and prevent distortion

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent incorporates phase tracking reference signals that provide feedback information about phase variations, enabling the receiver to compensate for any phase distortion and maintain reliable signal detection

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12532326B2Method of transmitting and receiving signal in wireless communication system and apparatus thereof

Publication Date: 2026.01.20 LG ELECTRONICS INC

AI summary

Provided is a method performed by a UE in a wireless communication system including receiving at least one synchronization signal from a base station (BS), receiving system information from the BS, receiving a radio resource control (RRC) message from the BS, wherein the RRC message includes information on a number of data allocation offset index group candidates related to a data allocation offset, receiving downlink control Information (DCI) from the BS, wherein the DCI includes information on a data allocation offset index related to the data allocation offset.