Incremental Peak Suppression Information Message for PAPR Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless communication systems face challenges in reducing peak to average power ratio (PAPR), which increases power consumption in base stations and user equipment, especially with higher order modulation schemes like 256 QAM and 1024 QAM, as power amplifiers require large backoff to operate efficiently, leading to inefficiency.
Innovation Solution
The implementation of incremental peak suppression information messages (PSIMs) that clip peaks exceeding a threshold amplitude, allowing for efficient power amplifier operation by transmitting clipped signals with accompanying PSIMs using lower modulation schemes, enabling each user equipment to decode and reconstruct the original signal effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If higher order modulation schemes (256 QAM, 1024 QAM) are used to increase data rate, then spectral efficiency is improved, but power consumption increases due to large PAPR requiring power amplifier backoff
Solution Approach 1:
The peak suppression information is divided into multiple incremental PSIMs, each containing a portion of the clipped peak information. This segmentation allows UEs to selectively decode only the necessary portions based on their MCS, reducing the overall power consumption while maintaining spectral efficiency benefits
Solution Approach 2:
The patent changes the modulation scheme parameter for PSIM transmission from high-order modulation to low-order modulation (QPSK), which is more robust to channel conditions and requires less power amplifier backoff, thereby reducing power consumption while still enabling high data rates for the actual data channel
2Loss of energy
If peak suppression is applied to reduce PAPR and power consumption, then power amplifier efficiency is improved, but signal fidelity deteriorates due to clipping
Solution Approach 1:
The patent implements a feedback mechanism where clipped peak information is transmitted back to the UE through incremental PSIMs. The UE uses this feedback information to reconstruct the clipped peaks, thereby recovering signal fidelity that was lost during the clipping process while maintaining the power efficiency benefits of peak suppression
Solution Approach 2:
The incremental PSIMs act as an intermediary carrier that conveys the clipped peak information from the base station to the UE. This intermediary mechanism enables the UE to reconstruct the original signal accurately without directly transmitting the high-PAPR signal, thus maintaining both power efficiency and signal fidelity
3Manufacturing precision
If incremental PSIMs are transmitted to enable signal reconstruction, then signal fidelity is improved, but message complexity increases
Solution Approach 1:
The peak suppression information is segmented into multiple incremental PSIMs, each containing a specific portion of the clipped peaks. This segmentation reduces the complexity for each individual PSIM message, making them easier to decode, while collectively providing complete information for accurate signal reconstruction
Solution Approach 2:
The patent applies partial action by transmitting only the necessary portions of peak information that are required for successful decoding at each MCS level. UEs decode only the PSIMs relevant to their MCS, avoiding unnecessary processing of excessive information, thus reducing overall system complexity while maintaining reconstruction accuracy
Data Source
AI summary
A transmitting device may reduce a peak to average power ratio (PAPR) ratio by clipping samples that have an amplitude exceeding a threshold. For a downlink transmission, the transmitting device may transmit an incremental peak suppression information message (PSIM) to multiple user equipments (UEs). A UE may receive downlink control information (DCI) indicating a data and a modulation and coding scheme (MCS) for the UE, and at least a first incremental PSIM. The UE may decode at least the first incremental PSIM that is applicable to a MCS lower than or equal to the MCS for the UE. The UE may determine whether to decode one or more subsequent incremental PSIMs based on the MCS for the UE. The UE may apply peak information from the incremental PSIMs to the data channel. The UE may decode the data channel based on the MCS for the UE.