Power Amplifier-Aware Modulation with Adjusted Symbol Constellations
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Solution Overview
Problem
Conventional modulation methods in wireless communication systems are impaired by distortion effects caused by power amplifier (PA) amplification, which introduces nonlinear and memory effects that affect the uniform scaling and demodulation of modulation symbols.
Innovation Solution
The implementation of adjusted symbol constellations that pre-compensate for PA distortion effects, using techniques such as digital pre-distortion and AI-based modulation methods, to ensure uniform scaling and reduce distortion impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional modulation methods are used with standard symbol constellations, then the system is simple to implement, but PA distortion causes symbol demodulation errors and reduced reliability
Solution Approach 1:
The patent applies preliminary action by pre-compensating for PA distortion through adjusted symbol constellations before transmission. The constellation points are modified in advance to counteract the expected nonlinear and memory effects of the power amplifier, ensuring that after PA amplification, the symbols remain distinguishable and can be accurately demodulated at the receiver.
Solution Approach 2:
The patent changes the parameters of the symbol constellation to adapt to PA characteristics. Specifically, the constellation points are adjusted in terms of their amplitude and phase values to compensate for PA nonlinearities and memory effects, transforming the standard constellation into a PA-aware adjusted constellation that maintains symbol integrity after amplification.
2Power
If PA amplification is applied to combat signal impairments, then signal strength is improved, but nonlinear and memory effects cause symbol smearing and increased error rates
Solution Approach 1:
The patent applies preliminary anti-action by introducing adjusted symbol constellations that pre-compensate for the harmful distortion effects of the power amplifier. The constellation adjustments are designed to counteract the nonlinear and memory effects that will be introduced by PA amplification, thereby neutralizing the harmful effects while maintaining the beneficial signal strength enhancement.
3Measurement precision
If standard symbol constellations are used, then the modulation scheme is simple, but PA memory effects cause smearing that reduces demodulation precision
Solution Approach 1:
The patent applies preliminary action by pre-compensating for PA distortion through adjusted symbol constellations before transmission. The constellation points are modified in advance to counteract the expected nonlinear and memory effects of the power amplifier, ensuring that after PA amplification, the symbols remain distinguishable and can be accurately demodulated at the receiver.
Solution Approach 2:
The patent changes the parameters of the symbol constellation to adapt to PA characteristics. Specifically, the constellation points are adjusted in terms of their amplitude and phase values to compensate for PA nonlinearities and memory effects, transforming the standard constellation into a PA-aware adjusted constellation that maintains symbol integrity after amplification.
Data Source
AI summary
Methods and devices for transmission symbol modulation that accounts for distortion introduced by a power amplifier (PA). A user equipment (UE) comprises a transceiver and a processor. The transceiver is configured to transmit, to a base station (BS), UE capability information that indicates support for adjusted symbol constellations, wherein the adjusted symbol constellations are adjusted to pre-compensate for distortion effects of a power amplifier (PA) in the transceiver, and receive, from the BS, a modulation and coding scheme (MCS) indication. The processor is configured to determine, based on the MCS indication, an adjusted symbol constellation, and generate modulation symbols from input bits according to the determined adjusted symbol constellation. The transceiver is further configured to transmit, to the BS, the modulation symbols.