Power Amplifier Linearity Switching for Wireless Coexistence
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Solution Overview
Problem
Wireless communication devices face interference issues due to energy leakage between different communication technologies, leading to desense, which can render certain channel bands unusable and result in data errors or complete loss of connections.
Innovation Solution
Implementing transmission power modulation and increasing the linearity of power amplifiers during scheduled data reception periods to reduce interference between aggressor and victim technologies, thereby preventing data corruption and maintaining channel band usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power is increased for aggressor technology, then transmission reliability is improved, but interference to victim technology increases causing desense
Solution Approach 1:
The power amplifier operates in different modes (linear mode vs. saturated mode) depending on the timing requirements. During victim technology reception periods, the aggressor transmission uses linear mode with reduced power to minimize interference. During non-critical periods, it switches to saturated mode for maximum power efficiency and reliability.
Solution Approach 2:
The system periodically switches between linear and saturated operation modes based on scheduled reception periods of victim technologies. This periodic modulation of transmission characteristics ensures that interference is minimized during critical reception windows while maintaining high power efficiency during other periods.
2Use of energy by moving object
If power amplifier operates in saturated mode for power efficiency, then energy consumption is reduced, but linearity decreases causing out-of-band emissions and harmonics
Solution Approach 1:
The power amplifier dynamically switches between saturated mode (for power efficiency) and linear mode (for low emissions) based on real-time communication requirements. The system monitors scheduled reception periods and adjusts the amplifier operating mode accordingly, using saturated mode during non-critical periods and linear mode during victim technology reception periods.
Solution Approach 2:
The system changes the operational parameters of the power amplifier (biasing conditions, input power level) to switch between linear and saturated modes. During linear mode, the amplifier is biased to operate in its linear region with reduced input power to minimize emissions. During saturated mode, the amplifier operates at maximum efficiency with higher input power.
3Adaptability or versatility
If multiple wireless technologies operate concurrently, then device versatility is improved, but channel interference increases rendering bands unusable
Solution Approach 1:
The system receives advance notifications from victim technologies about their scheduled reception periods. Using this preliminary information, the aggressor technology proactively adjusts its transmission power and mode before interference-critical periods begin, ensuring that victim technology reception is not compromised while maintaining aggressor transmission capability.
Solution Approach 2:
The system implements a feedback mechanism where victim technologies notify the aggressor technology of their reception schedules. The aggressor technology uses this feedback information to dynamically adjust its transmission characteristics, creating a coordinated multi-technology operation that minimizes interference while maintaining versatility.
Data Source
AI summary
A method of increasing power amplifier linearity to facilitate in-device coexistence between wireless communication technologies is provided. The method can include determining a scheduled time period during which data is received by a device via a first wireless communication technology. The method can further include adjusting an operational parameter of a power amplifier applied to a transmission from the device via a second wireless communication technology to increase a linearity of the power amplifier during the scheduled time period.