Multi-Loop PAPR Control Circuit for Wireless Signal Integrity

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Solution Overview

Problem

In wireless communication systems, particularly in OFDM, high peak-to-average power ratio (PAPR) leads to signal impairment issues such as error vector magnitude (EVM), adjacent channel leakage power ratio (ACLR), and spectral emission mask (SEM) violations, due to out-of-phase subcarriers causing sudden peaks in output power.

Innovation Solution

A multi-loop, multi-phase technique is employed to constrain PAPR by using an inner loop with multiple phases to reduce power-related errors and an outer loop to update the power level, optimizing the trade-off between EVM and ACLR through parametric and non-parametric methods.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If PAPR reduction techniques are applied, then signal impairment is reduced, but device complexity increases

Engineering Contradiction:

Improvesignal qualityVSAvoidcircuit complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The PAPR control function is divided into multiple independent modules: pre-transmission encoding circuit, PAPR controlling circuit with inner and outer loops, and transmitter circuit. Each module performs a specific function, allowing for targeted optimization and reducing overall system complexity while maintaining effectiveness.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

PAPR control is performed in the pre-transmission stage before the signal is sent through the channel. The encoding circuit and PAPR controlling circuit prepare and adjust the signal in advance, preventing signal impairment before it occurs rather than correcting it after transmission.

Inventive Principle:

Principle #10Preliminary action

2Manufacturing precision

If multi-loop multi-phase technique is used to constrain PAPR, then power-related errors are reduced, but processing time increases

Engineering Contradiction:

Improvepower level precisionVSAvoidsignal processing time

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

The control technique uses periodic sampling and adjustment through inner and outer loops. The inner loop performs rapid periodic adjustments to constrain PAPR, while the outer loop periodically updates power levels. This periodic action achieves precise power control without requiring continuous processing.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system dynamically adjusts the number of phases and iteration cycles based on signal conditions. When PAPR is already within acceptable ranges, fewer iterations are performed, reducing processing time. When PAPR exceeds thresholds, additional phases are activated to achieve the required precision.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS11540230B2Parametric and non-parametric peak-to-average power ratio (PAPR) reduction techniques

Publication Date: 2022.12.27 SAMSUNG ELECTRONICS CO LTD

AI summary

According to one general aspect, an apparatus may include a pre-transmission circuit configured to encode a data signal for communication. The apparatus may include a peak-to-average-power ratio (PAPR) controlling circuit configured to set a power level for a level-adjusted data signal. In some embodiments, the PAPR circuit may be configured to set the power level by employing a multi-loop, multi-phase technique, wherein an inner loop employs multiple phases to constrain the PAPR and reduce at least one power-related error condition, and wherein an outer loop updates the power level. The apparatus may include a transmitter circuit configured to transmit the level-adjusted data signal.