Multi-Antenna Delay-Doppler Shifting for High-Mobility Signals

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Solution Overview

Problem

Existing wireless communication systems face challenges in effectively managing cyclic delay and Doppler shift, which affect signal quality and efficiency in environments with varying speeds and directions of user equipment.

Innovation Solution

Implementing techniques for applying and receiving cyclic delay and Doppler shift in a delay-Doppler domain for signal transmission and reception, using methods such as orthogonal time frequency space (OTFS) waveform and open-loop precoding to manage signal timing and frequency shifts.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If cyclic delay and Doppler shift are applied to signal transmission from multiple antennas, then signal quality and communication efficiency are improved in dynamic environments, but device complexity and processing requirements increase

Engineering Contradiction:

Improvesignal qualityVSAvoidprocessing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies cyclic delay and Doppler shift as open-loop precoding operations before signal transmission. By pre-processing the signals with predetermined delay and frequency shift values, the system compensates for expected channel variations in advance, improving signal quality without requiring complex real-time feedback processing

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent transforms signals from the time-frequency domain to the delay-Doppler domain by applying cyclic delay shifts and Doppler shifts. This parameter transformation in the delay-Doppler domain simplifies the representation of time-varying channels and enables more efficient signal processing for high-mobility scenarios

Inventive Principle:

Principle #35Parameter changes

2Productivity

If signals are transmitted from multiple antennas with different delay and frequency shifts, then communication performance in high-mobility environments is improved, but the complexity of signal reception and processing increases

Engineering Contradiction:

Improvecommunication efficiencyVSAvoidreception complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent introduces a delay-Doppler domain as an additional dimension for signal representation and processing. By transforming the conventional time-frequency domain processing to delay-Doppler domain, the system handles multiple antenna signals with different delays and frequency shifts more efficiently, separating the complexity of time-varying channel effects into distinct delay and Doppler components

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Enhances signal quality and efficiency by compensating for timing and frequency distortions, improving communication performance in dynamic environments.

Implementation Method 1

applying at least one of an amount of delay or an amount of Doppler shift to a signal transmission including a first signal for transmission from a first antenna and a second signal for transmission from a second antenna

Methodology Applied

Scientific EffectDoppler shift: Doppler Effect

Implementation Method 2

Methodology Applied

Scientific EffectTime delay:

Data Source

PatentUS12483297B2Cyclic delay and doppler shift

Publication Date: 2025.11.25 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a transmitter may apply at least one of an amount of delay or an amount of Doppler shift to a signal transmission including a first signal for transmission from a first antenna and a second signal for transmission from a second antenna, wherein the second signal is shifted, relative to the first signal, in a delay-Doppler domain, by the at least one of the amount of delay or the amount of Doppler shift. The transmitter may output, in a time-frequency domain, the first signal from the first antenna and the second signal from a second antenna. Numerous other aspects are described.