Selective Envelope Modulation for Lower ACLR Power Draw
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Solution Overview
Problem
Current mobile phone technologies face challenges in meeting the 3GPP standard requirements for adjacent channel leakage power ratio (ACLR) while minimizing power consumption, particularly in components like amplitude modulation paths, which consume high current and contribute to excess power usage.
Innovation Solution
A modulation system with an amplitude and phase modulation path, where the amplitude modulation path operates at a reduced rate or is selectively disabled when the phase modulated signal meets specifications, incorporating a digital-to-analog converter and operational amplifier, and using control signals to adjust clock rates and power consumption, particularly in polar modulation systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the amplitude modulation path operates at full speed to meet ACLR requirements, then signal quality is improved, but power consumption increases
Solution Approach 1:
The system dynamically adjusts the operating speed of the amplitude modulation path based on signal conditions. When phase modulation alone suffices for ACLR compliance, the amplitude path operates at reduced speed or is disabled. When amplitude modulation is needed for signal quality, the path operates at full speed. This dynamic adaptation resolves the contradiction between maintaining reliability and reducing energy use.
Solution Approach 2:
The invention changes the operating parameter (clock rate/speed) of the amplitude modulation path components based on system needs. By varying this parameter between full speed and reduced speed/disabled states, the system achieves both low power consumption during phase-only modulation and high signal quality when amplitude modulation is required, thus resolving the reliability-energy tradeoff.
2Use of energy by moving object
If the amplitude modulation path is disabled to reduce power consumption, then power savings are achieved, but signal quality may deteriorate
Solution Approach 1:
The system dynamically switches between disabled and active states of the amplitude modulation path based on whether phase modulation alone can meet signal quality requirements. This dynamic control ensures power savings when possible while maintaining signal quality when needed, resolving the contradiction between energy efficiency and reliability.
3Use of energy by moving object
If components operate at reduced speed to lower power consumption, then energy efficiency is improved, but processing capability decreases
Solution Approach 1:
The processing speed of amplitude modulation components is dynamically adjusted based on operational requirements. During phase-only modulation, components operate at reduced speed for energy efficiency. When amplitude modulation is needed, components switch to full processing capability. This dynamic adjustment resolves the contradiction between energy efficiency and processing capability.
Solution Approach 2:
The system employs periodic evaluation of signal requirements to determine whether full-speed amplitude modulation processing is needed. By alternating between reduced-speed operation (for energy efficiency) and full-speed operation (for processing capability) based on periodic assessment of modulation needs, the system resolves the productivity-energy contradiction.
Data Source
AI summary
A modulation system includes an amplitude modulation path and a phase modulation path coupled to the amplitude modulation path. One of the amplitude modulation path and the phase modulation path receive a reduced current such that the reduced current reduces power consumption by the system. Preferably, the amplitude modulation path receives the reduced current. The amplitude modulation path has a first set of components and a second set of components. The first set of components consumes less power by using slower operation. The second set of components consumes less power by effectively not operating, or being turned off.