Side-Communication Channel Radar Waveform Parameter Variation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In multi-radar coexistence scenarios, radar systems face interference from nearby radar transmissions, which degrades target detection performance due to indistinguishable reflections and strong direct signal interference, making it difficult to identify targets amidst ghost targets and high interference levels.
Innovation Solution
The use of a side-communication channel for exchanging radar information allows user equipment (UEs) to select and transmit varying waveform parameters, including frequency range, chirp duration, and frequency offset, to suppress interference by shifting interference peaks beyond the range of interest and phase-coding chirps to avoid coherent addition with other radar waveforms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radar systems transmit radio frequency waveforms for target detection, then target detection capability is improved, but interference from nearby radar transmissions increases
Solution Approach 1:
The patent applies parameter changes by dynamically varying waveform parameters (such as frequency offset, chirp duration, and frequency range) for different chirps in the radar waveform. This allows the radar system to adapt its transmission characteristics to avoid interference peaks from other radars, thereby maintaining target detection capability while reducing interference impact.
Solution Approach 2:
The patent implements dynamics by introducing time-varying waveform parameters where at least one parameter changes across different chirps within a radar waveform. This dynamic adjustment enables the radar to shift interference peaks beyond the range of interest and phase-code chirps to prevent coherent addition, transforming a static interference problem into a manageable dynamic scenario.
2Device complexity
If radar waveforms use fixed parameters for transmission, then system complexity is reduced, but interference suppression capability deteriorates
Solution Approach 1:
The patent introduces parameter changes by selecting and varying waveform parameters across different chirps based on received interference information. This allows the system to suppress interference effectively while maintaining manageable complexity through structured parameter selection from predefined sets and systematic variation patterns.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In some systems, radio signals may reach a receiving antenna at a user equipment by two or more paths, which can cause interference (e.g., destructive multipath interference, constructive multipath interference, etc.). To reduce the interference, the user equipment may perform interference suppression, shaping, or both based on choosing radar waveform patterns that are varied across chirps. In one aspect, the user equipment (e.g., a vehicle) may identify waveform patterns selected by nearby vehicles based on side channel or centralized signaling and may suppress or shape interference by selecting waveform parameters based on this information. In one aspect, the pattern of waveform parameters is chosen from a codebook of patterns. The selected pattern can be broadcasted to the other vehicles using a side-communication channel.