WiFi Radar Frame Retry Control Under Wireless Interference
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Solution Overview
Problem
WiFi radar technology faces challenges in overcoming signal interference from other wireless signals, such as those from competing WiFi networks and Bluetooth communications, which can degrade the count of valid radar frames during sensing periods.
Innovation Solution
A WiFi radar control method that includes transmitting multiple radar frames, analyzing reflection echoes for interference, and automatically retrying frames as needed to maintain a target frame count within each sensing period, utilizing a control unit to manage radar and communication operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple radar frames are transmitted to maintain sufficient valid frames, then radar detection reliability is improved, but signal interference from other wireless communications increases
Solution Approach 1:
The patent implements dynamic adjustment of radar frame transmission parameters based on detected interference levels. The system monitors signal quality and adaptively modifies transmission timing, frequency, or frame sequence to maintain reliable detection while minimizing interference with co-channel WiFi and Bluetooth communications
Solution Approach 2:
The system changes operational parameters such as transmission power, frame interval, and frequency offset in response to detected interference conditions. By dynamically adjusting these parameters, the system maintains adequate valid frame counts for reliable radar detection while reducing harmful interference to other wireless signals
2Measurement precision
If retry frames are transmitted to compensate for interfered frames, then measurement precision is improved, but use of energy increases
Solution Approach 1:
The patent employs feedback mechanisms where the system monitors the quality of received reflection echoes and detects interference conditions. Based on this feedback, the control unit intelligently determines when retry transmission is necessary, transmitting retry frames only when interference is detected and the number of valid frames falls below the required threshold, thereby maintaining measurement precision while minimizing unnecessary energy consumption
Solution Approach 2:
Instead of transmitting retry frames for every interfered signal, the system applies partial action by selectively retrying only when the number of valid frames drops below the minimum required count. This approach maintains adequate measurement precision while avoiding excessive energy expenditure on unnecessary retransmissions
3Measurement precision
If the sensing period is extended to collect sufficient valid frames, then detection accuracy is improved, but loss of time increases
Solution Approach 1:
The system performs preliminary actions by proactively detecting interference conditions and initiating retry frame transmissions before the sensing period expires. The control unit monitors frame validity in real-time and triggers retry transmissions during the current sensing period rather than waiting for it to end, thereby maintaining detection accuracy without extending the sensing period
Data Source
AI summary
A WiFi radar control method includes following steps. In a first radar transceiving slot, first radar frames are sequentially transmitted, and first reflections corresponding to the first radar frames are received. Waveforms of the first reflections are analyzed to determine whether the first radar frames are subject to interference. When interference is detected in the first radar frames, a retry count is incremented. When the retry count is not zero, at least one retry radar frame is transmitted in the first radar transceiving slot or in a second radar transceiving slot following the first radar transceiving slot.