WUR Transmit Waveform Random Cyclic Shift for FCC Compliance
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Solution Overview
Problem
Current Wake-Up Receiver (WUR) transmit waveforms in wireless communications generate spectral lines that exceed FCC limits, leading to inefficiencies in power usage and compliance issues.
Innovation Solution
Applying a random cyclic shift to each ON symbol in the WUR transmit waveform, ensuring that each ON preamble/data bit has different pulse properties, thereby mitigating spectral lines and complying with FCC regulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a standard OOK waveform is used for WUR transmission, then the transmission is simple and power-efficient, but spectral lines are generated that exceed FCC limits
Solution Approach 1:
The patent applies parameter changes by modifying the OOK waveform characteristics through random cyclic shifts. Each ON symbol is transmitted with a different cyclic shift parameter, which changes the spectral distribution of the transmitted signal. This randomization technique spreads the spectral energy and eliminates the discrete spectral lines that would otherwise exceed FCC limits, while maintaining the fundamental OOK modulation scheme.
Solution Approach 2:
The patent introduces dynamics by making the waveform parameters variable rather than static. Instead of using a fixed OOK waveform for all transmissions, the system dynamically adjusts the cyclic shift parameter for each ON symbol based on random selection. This dynamic parameter adjustment transforms the static spectral pattern into a time-varying spectrum that complies with regulatory requirements.
2Reliability
If the same OOK waveform is used for each ON symbol, then power consumption is minimized, but spectral lines are created that violate FCC regulations
Solution Approach 1:
The patent changes the waveform parameters by applying random cyclic shifts to each ON symbol transmission. This parameter modification redistributes the spectral energy across different frequencies over time, eliminating the concentrated spectral lines that cause FCC compliance issues. The technique maintains power efficiency by still using OOK modulation while adding only minimal processing for the cyclic shift application.
3Object-generated harmful factors
If random cyclic shifts are applied to each ON symbol, then spectral lines are mitigated and FCC limits are met, but waveform complexity increases
Solution Approach 1:
The patent implements parameter changes by modifying the cyclic shift value for each ON symbol. This simple parameter adjustment effectively mitigates spectral lines by randomizing the phase and frequency distribution of the transmitted OOK signal. The implementation requires minimal additional complexity, primarily involving a random number generator and a cyclic shift operation in the signal processing chain.
Data Source
AI summary
This disclosure describes systems, methods, and devices related to generating a wake up receiver (WUR) transmit waveform. A device may determine one or more symbols bit sequence of a wake up receiver (WUR) frame to be sent to a first station device capable of decoding the bit sequence. The device may determine a first symbol of the one or more symbols, wherein the first symbol is associated with an ON state. The device may determine a second symbol of the one or more symbols, wherein the second symbol is associated with the ON state. The device may generate a first on-off keying (OOK) waveform associated with the first symbol. The device may generate a second OOK waveform associated with the second symbol, wherein the second OOK waveform is different from the first OOK waveform. The device may cause to send the WUR frame to the first station device based on the first OOK waveform and the second OOK waveform.