FMCW Radar Waveform Parameter Selection for Multi-Radar Coexistence
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Solution Overview
Problem
Radar systems face interference issues when multiple radar sources are in close proximity, leading to degraded target detection performance due to mutual interference, particularly in vehicular applications where radar transmissions from nearby vehicles can cause significant interference.
Innovation Solution
A method and apparatus for a user equipment (UE) to select frequency modulated continuous wave (FMCW) waveform parameters, including varying the slope and frequency offset of chirps, to mitigate interference by identifying and adapting to nearby radar waveforms, thereby reducing mutual interference and enhancing coexistence among multiple radar systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple radar systems transmit simultaneously in close proximity, then radar coverage and detection capability are maintained, but mutual interference degrades target detection performance
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting FMCW waveform parameters including chirp slope, frequency offset, and phase modulation for each radar transmission. By varying these parameters based on detected interference characteristics, the system transforms the radar signal to suppress mutual interference while maintaining detection reliability. The waveform parameters are modified in response to measured interference from other radar systems, enabling adaptive coexistence.
Solution Approach 2:
The patent implements feedback by detecting interference from other radar systems, analyzing the interference characteristics, and using this information to select appropriate waveform parameters for the next transmission. The system continuously monitors the radar environment, measures interference levels, and adjusts waveform parameters accordingly, creating a closed-loop control mechanism that reduces mutual interference and improves detection performance.
2Adaptability or versatility
If radar waveform parameters are varied to suppress interference, then coexistence among multiple radars is improved, but system complexity increases
Solution Approach 1:
The patent manages complexity by limiting waveform parameter variations to a predefined set of discrete values for chirp slope, frequency offset, and phase modulation. Rather than allowing continuous parameter adjustment, the system selects from predetermined options, simplifying the implementation while still achieving interference suppression. This discrete parameter approach reduces computational burden while maintaining adaptability.
Solution Approach 2:
The patent applies self-service by enabling each radar system to autonomously detect interference, analyze the radar environment, and select appropriate waveform parameters without requiring coordination with other systems. Each radar independently monitors its own transmissions and adjusts its parameters based on detected interference, eliminating the need for complex centralized control or inter-system communication protocols.
Data Source
AI summary
Methods, systems, and devices for radar signaling s are described. In some systems, devices may select radar parameters (e.g., frequency modulated continuous wave waveform parameters) to support coexistence for multiple radar sources in the system. To reduce mutual interference between radar waveforms in a system, a user equipment may detect interference from at least one interference source (e.g., another device transmitting a radar waveform) and may select waveform parameters for transmission of a radar waveform based on the detected interference. For example, the user equipment may determine slopes, frequency offsets, codewords, or a combination thereof used by nearby devices in the system (e.g., per chirp or for a waveform) and may select waveform parameters that result in low mutual interference with the determined slopes, frequency offsets, codewords, or combination thereof. The user equipment may transmit the radar waveform according to the selected waveform parameters.