Adaptive Signal Compression Mode for Nonlinear Distortion Mitigation

Solution Overview

Problem

Conventional communication systems suffer from performance degradation due to nonlinear distortion, leading to sensitivity loss and spectral regrowth, which interferes with adjacent channels and limits data transmission efficiency.

Innovation Solution

A wireless communication system that includes a transceiver with circuitry to determine signal processing capabilities of connected devices and adaptively switch between high-EVM and low-EVM compression modes, using distortion mitigation techniques based on a model of transmitter nonlinearity to counteract nonlinear effects, enabling seamless operation in both modes independently of other devices.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional communication methods are used, then system simplicity is maintained, but performance degrades severely in the presence of nonlinear distortion

Engineering Contradiction:

Improvecommunication performanceVSAvoidsignal processing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies digital pre-distortion to the transmitted signal before it reaches the nonlinear power amplifier. This preliminary action pre-compensates for the anticipated nonlinear distortion, allowing the receiver to receive a cleaner signal without requiring complex distortion mitigation techniques, thus resolving the contradiction between reliability and complexity.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces an intermediary model of transmitter nonlinearity that characterizes the distortion effects. This model serves as a mediator between the transmitter and receiver, enabling the receiver to accurately predict and compensate for distortion without directly processing the highly distorted signal, thereby improving reliability while controlling complexity.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Length of stationary object

If transmit power is increased to extend link distance, then communication range improves, but nonlinear distortion and spectral regrowth increase

Engineering Contradiction:

Improvelink distanceVSAvoidnonlinear distortion

Core Design Contradiction:

Length of stationary objectVSObject-generated harmful factors

Solution Approach 1:

The patent applies digital pre-distortion to the transmitted signal before it reaches the nonlinear power amplifier. This preliminary action pre-compensates for the anticipated nonlinear distortion, allowing the receiver to receive a cleaner signal without requiring complex distortion mitigation techniques, thus resolving the contradiction between reliability and complexity.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent converts the harmful nonlinear distortion into a beneficial effect by using the distortion model to guide the pre-distortion compensation. The same nonlinearity that causes spectral regrowth is precisely characterized and reversed through pre-distortion, turning the harmful effect into a controlled and compensated phenomenon that enables extended link distance without excessive distortion.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Reliability

If distortion mitigation techniques are applied, then sensitivity loss is reduced, but processing complexity increases

Engineering Contradiction:

Improvereceiver sensitivityVSAvoidsignal processing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies digital pre-distortion to the transmitted signal before it reaches the nonlinear power amplifier. This preliminary action pre-compensates for the anticipated nonlinear distortion, allowing the receiver to receive a cleaner signal without requiring complex distortion mitigation techniques, thus resolving the contradiction between reliability and complexity.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent uses feedback from the received signal to refine the distortion model and improve pre-distortion compensation. By continuously monitoring the actual distortion and adjusting the compensation parameters, the system achieves high receiver sensitivity while keeping processing complexity manageable through adaptive rather than purely computational approaches.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS10361808B2System, device, and method for multi-mode communications

Publication Date: 2019.07.23 AVAGO TECHNOLOGIES INTERNATIONAL SALES PTE LTD

AI summary

A device includes circuitry configured to determine one or more signal processing capabilities of another device in communication with the device. The device configures a signal compression mode of the device to correspond to a first signal compression mode of a plurality signal compression modes based on the one or more signal processing capabilities of the other device. The device s configured to modify, in response to detecting variations in one or more network configuration properties or the one or more signal processing capabilities of the other device, the signal compression mode of the device.