Tone Phase Rotation for Lower PAPR in Wideband Wi‑Fi Signals
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Solution Overview
Problem
Conventional phase rotation schemes in wireless communication devices are inadequate for wider and non-contiguous frequency bandwidths, leading to increased peak-to-average power ratio (PAPR) and signal distortion, especially in emerging IEEE standards supporting wider bandwidth modes.
Innovation Solution
The method involves determining phase rotations for each tone of a signal based on a carrier index range and bandwidth mode, applying these rotations without considering preamble puncturing or front-end bandwidths, and using selected multiplier values for pre-EHT modulated tones, to minimize PAPR across various bandwidth modes including 20 MHz, 40 MHz, 80 MHz, 160 MHz, and 80+80 MHz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional phase rotation schemes are used, then compatibility with existing standards is maintained, but PAPR increases and signal distortion occurs in wider bandwidth modes
Solution Approach 1:
The patent modifies the phase rotation parameters specifically for pre-EHT modulated tones in wider bandwidth modes (80 MHz, 160 MHz, 80+80 MHz). By changing the phase rotation values from conventional schemes, the patent reduces PAPR and signal distortion while maintaining compatibility with legacy standards for other tones.
2Productivity
If phase rotations are optimized for wider bandwidth modes, then PAPR is reduced and transmission efficiency improves, but compatibility with conventional schemes may be compromised
Solution Approach 1:
The patent applies different phase rotation strategies to different portions of the signal spectrum. Specifically, pre-EHT modulated tones in wider bandwidth modes receive optimized phase rotations for reduced PAPR, while other tones maintain conventional phase rotations to ensure compatibility with existing standards and devices.
3Power
If power backoff values are reduced through phase rotation optimization, then power amplifier efficiency improves, but signal distortion may increase without proper phase rotation design
Solution Approach 1:
The patent applies optimized phase rotations to pre-EHT modulated tones before transmission in wider bandwidth modes. This preliminary phase adjustment reduces the peak power requirements, allowing power amplifiers to operate with lower backoff values while maintaining signal quality and minimizing distortion through the carefully designed phase rotation pattern.
Data Source
AI summary
This disclosure provides methods, devices, and systems for a wireless communication device to perform signal phase rotation. In some implementations, the wireless communication device may determine a number of phase rotation parameters to be applied to a number of tones of a transmission signal. In some aspects, each of the phase rotation parameters indicates a phase rotation to be applied to each of the tones according to a carrier index range for each of the tones and a bandwidth mode for the transmission signal. In some implementations, the wireless communication device may apply the phase rotation parameters to respective ones of the tones according to the specified phase rotations and the carrier index ranges, and transmit the transmission signal from the wireless communication device according to the applied phase rotation parameters.