Complex Signal Rotation for Wireless Phase Modulation Compensation
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Solution Overview
Problem
Wireless communications devices with metal enclosures can experience degraded performance due to parasitic phase modulation, leading to inaccurate clock signal recovery and data reception issues, especially when close or far from other devices.
Innovation Solution
A communications device and method that utilize a complex multiplier, amplifier, delay element, and subtractor to generate and decode a rotation angle signal, allowing for phase rotation of input signals, thereby reducing reliance on clock-recovery mechanisms and minimizing the impact of parasitic phase modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal enclosure is used in wireless communications devices, then structural strength and protection are improved, but parasitic phase modulation is introduced causing loss of phase information and magnitude gradient
Solution Approach 1:
The patent converts the harmful parasitic phase modulation effect into a useful signal processing task by designing a phase rotation mechanism that intentionally applies phase rotation based on extracted magnitude gradient information. The system that was previously degrading performance (metal enclosure causing phase modulation) is now compensated for by using magnitude gradient extraction to drive corrective phase rotation in the signal path.
Solution Approach 2:
The patent implements a feedback loop where magnitude gradient information is continuously extracted from the received signal, processed through a phase rotation mechanism, and fed back to correct the phase information. The magnitude gradient extractor continuously monitors the signal and adjusts the phase rotation accordingly, creating a closed-loop system that compensates for the metal enclosure's harmful effects.
2Ease of operation
If traditional clock-recovery mechanisms are used, then data reception can be performed, but accuracy is degraded due to parasitic phase modulation and loss of magnitude gradient
Solution Approach 1:
The patent introduces magnitude gradient extraction as an intermediary process between the received signal and the phase rotation mechanism. Instead of directly relying on clock recovery from the degraded signal, the system extracts magnitude gradient information as an intermediate representation, which then drives the phase rotation to correct the signal before final data recovery. This intermediary step preserves information that would otherwise be lost.
Solution Approach 2:
The patent replaces traditional clock-recovery mechanisms with a magnitude gradient-based phase rotation system. Instead of using conventional phase-locked loop (PLL) clock recovery that is sensitive to phase distortions, the system uses magnitude gradient extraction combined with intentional phase rotation to achieve more robust data reception that is less susceptible to the metal enclosure's parasitic effects.
3Measurement precision
If phase rotation is applied to compensate for parasitic effects, then phase information accuracy is improved, but device complexity increases due to additional signal processing components
Solution Approach 1:
The patent designs the magnitude gradient extractor to serve multiple functions: it extracts magnitude gradient information for phase rotation control while also providing magnitude information for signal quality assessment. The phase rotation mechanism itself serves dual purposes by both correcting phase errors and preparing the signal for optimal demodulation. This multi-functionality reduces the need for separate dedicated components.
Solution Approach 2:
The patent merges the magnitude gradient extraction and phase rotation control into an integrated signal processing chain. Rather than having separate independent modules for magnitude detection, phase detection, and phase correction, the system combines these functions into a unified processing path where magnitude gradient information directly drives the phase rotation mechanism, reducing overall system complexity.
Data Source
AI summary
Embodiments of communications devices and methods for operating a communications device are described. In an embodiment, a communications device includes a complex multiplier configured to multiply a first input complex signal with a second input complex signal to generate an output complex signal, an amplifier configured to amplify an imaginary part of the output complex signal to generate an amplification result, a delay element configured to delay a rotation angle signal that is related to the second input complex signal, and a subtractor configured to subtract the amplification result from the delayed rotation angle signal to generate the rotation angle signal. Other embodiments are also described.