Index-Modulated Sensing Waveforms for Accurate MIMO Channel Estimation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing wireless communication systems face challenges in accurately processing index modulated sensing signals, particularly in challenging environments, and there is a need for improved techniques for channel estimation in downlink communication to multiple user equipments.

Innovation Solution

The implementation of index modulation of sensing waveforms, where assistance information is used to receive and process index modulated sensing signals, enabling accurate processing and channel estimation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If index modulated sensing signals are transmitted in challenging environments, then sensing capability is improved, but signal processing accuracy deteriorates

Engineering Contradiction:

Improvesensing capabilityVSAvoidsignal processing accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The network entity transmits assistance information about the index modulated sensing waveforms before the actual sensing signal processing occurs. This preliminary provision of waveform characteristics enables the wireless device to properly process the sensing signals even in challenging environments, resolving the contradiction between sensing capability and processing accuracy.

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If assistance information is provided for index modulated sensing waveforms, then channel estimation accuracy is improved, but communication overhead increases

Engineering Contradiction:

Improvechannel estimation accuracyVSAvoidcommunication overhead

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The assistance information extracts only the essential characteristics of the index modulated sensing waveforms needed for processing, rather than transmitting complete waveform data. This selective extraction provides sufficient information for accurate channel estimation while minimizing the communication overhead.

Inventive Principle:

Principle #2Taking out (Extraction)

3Productivity

If multiple user equipments receive downlink communication simultaneously, then system capacity is improved, but interference between users increases

Engineering Contradiction:

Improvesystem capacityVSAvoidinterference between users

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The assistance information acts as an intermediary that enables wireless devices to properly process index modulated sensing signals from multiple users. By providing waveform characteristics in advance, it facilitates multi-user downlink communication while the index modulation technique itself helps manage interference through its inherent signal structure.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12580803B2Joint index modulation and multiple input multiple output (MIMO) sensing in joint communication and sensing (JCS) systems

Publication Date: 2026.03.17 QUALCOMM INC

AI summary

In an aspect, a user equipment may receive assistance information for one or more index modulated sensing waveforms. The user equipment may receive index modulated sensing signals, the index modulated sensing signals based on the one or more index modulated sensing waveforms. The user equipment may process the index modulated sensing signals using at least some of the assistance information.