Receiver Oscillation Frequency Alternation for DFS Channel Detection
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Solution Overview
Problem
Current radio communication devices in the 5 GHz band face challenges in detecting radar signals efficiently, leading to potential interference and compliance issues due to the need for 'always-ON' detection capabilities, which increases power consumption and may result in delayed access to DFS-channels.
Innovation Solution
A receiver system that alternates the frequency of an oscillation signal between two different values to generate either an in-phase or quadrature component of a baseband signal, allowing for reduced power consumption and efficient detection of channel occupancy, including radar signals, by using an 'I only' or 'Q only' method, thereby enabling 'always-ON' operation without stalling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional radar detection methods are used to ensure compliance with DFS-channel regulations, then detection reliability is improved, but power consumption increases and access delay occurs
Solution Approach 1:
The patent implements periodic channel occupancy detection by alternating the oscillation signal frequency between two values at regular intervals. The receiver performs detection at specific time points rather than continuously, achieving compliant DFS-channel access with reduced power consumption by entering low-power states between detection periods
Solution Approach 2:
The patent changes the frequency parameter of the oscillation signal between two distinct values to enable detection of channel occupancy. By modulating the local oscillator frequency and comparing the phase/d frequency of received signals against these alternating frequencies, the system achieves reliable radar detection with lower power requirements than continuous monitoring
2Speed
If continuous radar detection is implemented to enable instant access to DFS-channels, then access speed is improved, but power consumption increases
Solution Approach 1:
The patent performs preliminary channel occupancy detection by checking the channel status before attempting to access DFS-channels. The receiver alternates oscillation frequencies and detects signal presence in advance, allowing the device to quickly determine channel availability and initiate transmission without delay when the channel is clear, while consuming minimal power during the brief detection window
Solution Approach 2:
The system implements periodic detection at critical moments before channel access attempts rather than maintaining continuous detection. This timing-based periodic action enables instant access capability when channels are available while dramatically reducing overall power consumption by keeping the detection circuit inactive during intervals between access attempts
3Productivity
If 'always-ON' detection capability is used to avoid waiting for one minute, then productivity is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic channel occupancy detection by alternating the oscillation signal frequency between two values at regular intervals. The receiver performs detection at specific time points rather than continuously, achieving compliant DFS-channel access with reduced power consumption by entering low-power states between detection periods
Solution Approach 2:
The receiver autonomously manages its detection operations by self-regulating the oscillation frequency alternation and detection timing. The system automatically determines when detection is necessary based on channel access requirements, eliminating the need for continuous high-power operation while maintaining the ability to instantly access DFS-channels when conditions permit
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
This approach significantly reduces power consumption by approximately 50% and allows for zero-stall DFS-channel detection, ensuring compliance with regulatory requirements and enabling instant access to DFS-channels by detecting channel occupancy accurately.
Implementation Method 1
an oscillation circuit configured to generate an oscillation signal, wherein the oscillation circuit is further configured to alternate a frequency of the oscillation signal between at least two different frequency values
Implementation Method 2
a down-conversion circuit configured to generate, based on a received radio frequency signal and the oscillation signal, one of an in-phase component and a quadrature component of a baseband signal
Implementation Method 3
a processing circuit configured to calculate, based on the in-phase component or the quadrature component, a signal power of the radio frequency signal
Data Source
AI summary
A receiver for detecting channel occupancy of a radio channel is provided. The receiver includes an oscillation circuit configured to generate an oscillation signal. The oscillation circuit is configured to alternate a frequency of the oscillation signal between at least two different frequency values. Further, the receiver includes a down-conversion circuit configured to generate, based on a received radio frequency signal and the oscillation signal, one of an in-phase component and a quadrature component of a baseband signal. The receiver additionally includes a processing circuit configured to calculate, based on the in-phase component or the quadrature component, a signal power of the radio frequency signal.