DPD Sampling Rate Switching for Out-of-Band Spur Suppression
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Solution Overview
Problem
Existing power amplifier circuits in wireless communication devices face inefficiencies due to operation in non-linear regions, leading to spurious signals, intermodulation products, and noise out-of-band, which are not effectively managed by current digital pre-distortion techniques.
Innovation Solution
Implement dynamic digital pre-distortion (DPD) sampling rate switching based on network signaling to adjust the DPD sampling rate in response to frequency shifts and network constraints, thereby optimizing power amplifier performance and reducing spurious signals and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If power amplifier operates in non-linear region to improve efficiency, then power consumption is reduced, but spurious signals and intermodulation products increase
Solution Approach 1:
The patent applies digital pre-distortion technology to pre-compensate the input signal before it enters the power amplifier. By calculating and applying distortion compensation in advance based on the amplifier's non-linear characteristics, the system enables the amplifier to operate in non-linear region for efficiency while maintaining linear output through the pre-applied inverse distortion.
Solution Approach 2:
The patent dynamically adjusts the DPD sampling rate based on operating conditions such as frequency shifts and network constraints. By changing the sampling rate parameter, the system optimizes the pre-distortion performance to match current operating conditions, effectively managing spurious signals while maintaining power amplifier efficiency.
2Device complexity
If fixed DPD sampling rate is used to simplify system design, then device complexity is reduced, but performance cannot adapt to frequency shifts and network constraints
Solution Approach 1:
The patent implements dynamic DPD sampling rate switching that adapts to changing operating conditions including frequency shifts and network constraints. The system transitions from a fixed sampling rate to a dynamic one that can be adjusted in real-time, improving performance adaptability while maintaining manageable system complexity through structured control mechanisms.
Solution Approach 2:
The patent employs feedback mechanisms where the network signaling and operating conditions are continuously monitored, and the DPD sampling rate is adjusted accordingly. This feedback loop enables the system to adapt to frequency shifts and network constraints automatically, balancing performance optimization with system complexity management.
Data Source
AI summary
An apparatus transmits a transmitted signal in a first band defined by a first center frequency and a first bandwidth, receives parameters associated with other signals in a second band defined by a first frequency and a second frequency greater than the first frequency, the first frequency and the second frequency being outside of the first bandwidth, the other signals being actual or prospective products of the transmitted signal, determines a first sampling frequency associated with the transmitted signal, determines a first digital pre-distortion (DPD) sampling rate based on the first sampling frequency, and changes the first DPD sampling rate to a second DPD sampling rate, greater than the first DPD sampling rate in response to a third frequency, corresponding to the first center frequency shifted by the first DPD sampling rate, being outside the second band. A DPD sampling rate is adjusted based on a network signaling value.