Transmitter Pre-equalization for XR Receiver Power Reduction

Solution Overview

Problem

Existing wireless communication systems, particularly in 5G NR technology, face challenges in balancing the computational demands of extended reality (XR) applications with the physical constraints of XR devices, such as weight, power consumption, and heat dissipation. This leads to high power consumption and complex modem designs in XR devices.

Innovation Solution

The proposed solution involves performing pre-equalization on signals intended for XR devices at a companion user equipment (UE) device rather than at the XR device itself. This process involves obtaining channel information for a sidelink channel, performing pre-equalization based on this information, and transmitting the pre-equalized signal to the XR device. This approach simplifies the receiver complexity at the XR device and reduces power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If equalization process is performed at the XR device receiver, then signal quality is improved, but device complexity and power consumption increase

Engineering Contradiction:

Improvesignal qualityVSAvoidreceiver complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent inverts the traditional equalization approach by performing pre-equalization at the transmitter (companion UE device) instead of equalization at the receiver (XR device). This reverses where the complex processing occurs, transferring the computational burden from the resource-constrained XR device to the more capable companion device, thereby reducing receiver complexity while maintaining signal quality.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent applies preliminary action by performing the equalization process in advance at the transmitter before signal transmission. The companion UE device calculates and applies equalization coefficients to pre-equalize the signal, so that when the signal reaches the XR device, the equalization is already complete, eliminating the need for complex receiver-side processing.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If equalization process is performed at the XR device receiver, then signal quality is improved, but power consumption increases

Engineering Contradiction:

Improvesignal qualityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent inverts the traditional equalization approach by performing pre-equalization at the transmitter (companion UE device) instead of equalization at the receiver (XR device). This reverses where the complex processing occurs, transferring the computational burden from the resource-constrained XR device to the more capable companion device, thereby reducing receiver complexity while maintaining signal quality.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent applies preliminary action by performing the equalization process in advance at the transmitter before signal transmission. The companion UE device calculates and applies equalization coefficients to pre-equalize the signal, so that when the signal reaches the XR device, the equalization is already complete, eliminating the need for complex receiver-side processing.

Inventive Principle:

Principle #10Preliminary action

3Device complexity

If pre-equalization is performed at the companion UE device, then receiver complexity is reduced, but transmitter processing load increases

Engineering Contradiction:

Improvereceiver complexityVSAvoidtransmitter processing load

Core Design Contradiction:

Device complexityVSObject-generated harmful factors

Solution Approach 1:

The patent introduces an intermediary (the companion UE device) that acts as a processing intermediary between the source and the XR device. The companion device performs the computationally intensive pre-equalization operations, serving as a mediator that relieves the XR device of complex processing while enabling the UE to leverage its greater computational resources.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS20250141718A1Transmitter pre-equalization for power reduction of XR device receiver

Publication Date: 2025.05.01 QUALCOMM INC

AI summary

A method for wireless communication at a user equipment (UE) and related apparatus are provided. In the method, the UE obtains channel information for a sidelink channel between the UE and a receiving device and performs a pre-equalization process on a signal to be transmitted to the receiving device based on the channel information to obtain a pre-equalized signal. The UE then transmits the pre-equalized signal to the receiving device through the sidelink channel.