Radar Interference Mitigation Using Pseudorandom Offset
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Solution Overview
Problem
High-frequency and small-wavelength wireless communications face challenges in balancing performance with the Federal Communications Commission's maximum permitted exposure limit, limiting their ability to take full advantage of increased data rates, and existing proximity detection methods are costly and bulky.
Innovation Solution
Implementing radar interference mitigation using pseudorandom offsets, which allow multiple computing devices to perform proximity detection based on unique frequency or time offsets, preventing false detections and allowing for adjusted transmission parameters to meet compliance guidelines without increasing false alarm rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If transmit power levels are increased to compensate for higher path loss, then communication range is improved, but power density increases and may exceed MPE limits
Solution Approach 1:
The patent implements periodic radar signals with frequency modulation, transmitting signals in structured time-frequency patterns that allow for lower average power while maintaining detection capability through signal processing of the periodic returns
Solution Approach 2:
The patent changes the frequency parameter of radar signals over time using frequency modulation, allowing the system to distinguish reflected signals from interference through frequency analysis while operating at lower power densities
2Duration of action of moving object
If beamforming is used to concentrate energy in a particular direction, then communication range is improved, but power density increases and may exceed MPE limits
Solution Approach 1:
The patent uses periodic radar signaling with frequency modulation rather than continuous high-power beamforming, distributing energy over time and frequency to reduce peak power density while maintaining effective communication range through coherent integration of periodic returns
3Adaptability or versatility
If multiple computing devices perform proximity detection on the same frequency channel, then device functionality is improved, but false detections increase due to co-channel interference
Solution Approach 1:
The patent applies frequency modulation to radar signals, allowing multiple devices to operate on the same frequency channel by distinguishing their signals through unique frequency modulation patterns and analyzing frequency shifts in reflected signals to identify true targets versus interference
Solution Approach 2:
The patent uses frequency analysis of reflected radar signals as feedback to distinguish between self-transmitted signal reflections and signals from other devices, adjusting detection thresholds based on the frequency characteristics of received signals to reduce false detections
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
Enables wireless devices to transmit signals with higher average power levels, enhancing communication range while adhering to safety limits, and reduces the need for costly and bulky sensors, thereby improving wireless performance and compliance.
Implementation Method 1
a radar-based technique that enables a computing device to detect an object and determine a range to the object
Implementation Method 2
a radar receive signal that includes a portion of the radar transmit signal that is reflected by an object
Implementation Method 3
a frequency of the radar receive signal is different than a frequency of the radar transmit signal based on the at least one pseudorandom offset
Data Source
AI summary
An apparatus is disclosed for radar interference mitigation using a pseudorandom offset. The apparatus includes an antenna array and a wireless transceiver. The wireless transceiver is coupled to the antenna array and is configured to transmit, via the antenna array, a radar transmit signal based on at least one pseudorandom offset. The wireless transceiver is also configured to receive, via the antenna array, at least a portion of another radar transmit signal from another apparatus. The wireless transceiver is additionally configured to receive, via the antenna array, a radar receive signal that includes a portion of the radar transmit signal that is reflected by an object. At a given time, a frequency of the radar receive signal is different than a frequency of the radar transmit signal based on the at least one pseudorandom offset.