Tone Reservation for PAPR Reduction in OFDM
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Solution Overview
Problem
Current methods for peak to average power ratio (PAPR) reduction in wireless communication systems, such as those using orthogonal frequency division multiplexing (OFDM) signals, face challenges including unnecessary processing complexity and increased signaling overhead due to random peak reduction tone (PRT) selection, which can lead to inefficiencies in power and computational resources.
Innovation Solution
The proposed solution involves tone reservation techniques where PRT locations are determined based on established patterns and sequences, with a base station indicating a PRT sequence to user equipment (UE), allowing for efficient PRT location determination without real-time optimization, thereby reducing operational complexity and signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If random peak reduction tone (PRT) selection is used for PAPR reduction, then PAPR reduction effectiveness is improved, but processing complexity and signaling overhead increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring PRT sequences and patterns before actual data transmission occurs. The base station and UE agree on predetermined PRT sequences in advance, eliminating the need for real-time random selection and reducing processing complexity during transmission while maintaining PAPR reduction effectiveness.
Solution Approach 2:
The patent implements self-service through deterministic PRT sequence generation where the UE can independently determine PRT locations based on pre-shared sequences and patterns without requiring complex real-time optimization or extensive signaling from the base station, thereby reducing processing burden while maintaining PAPR control.
2Reliability
If random PRT selection is used for PAPR reduction, then PAPR reduction effectiveness is improved, but signaling overhead increases
Solution Approach 1:
The patent reduces signaling overhead by performing the PRT selection action in advance during system configuration rather than during each data transmission. Pre-agreed PRT sequences are established beforehand, eliminating the need for continuous signaling of random PRT selections during transmission.
Solution Approach 2:
The UE performs self-service by independently determining PRT locations using pre-shared deterministic sequences without requiring extensive base station signaling. This autonomous approach reduces the information exchange burden while maintaining effective PAPR reduction.
3Reliability
If real-time optimization of PRT locations is performed, then PAPR reduction effectiveness is improved, but computational resources are consumed
Solution Approach 1:
The patent applies preliminary action by pre-computing and storing PRT sequences and patterns before actual transmission. This eliminates the need for computationally intensive real-time optimization during data transmission, reducing energy consumption while maintaining PAPR reduction effectiveness through predetermined patterns.
Solution Approach 2:
The patent uses copying by replicating predetermined PRT sequences and patterns rather than performing unique real-time optimization for each transmission. This copying approach significantly reduces computational resource requirements while maintaining consistent PAPR reduction performance.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may receive a resource allocation indicating a plurality of transmission tones comprising a subset of data tones of a plurality of data tones and a subset of peak reduction tones (PRTs) of a plurality of PRTs, wherein the resource allocation indicates a plurality of data tone locations and a plurality of PRT locations within a particular bandwidth, wherein a subset of PRT locations of the plurality of PRT locations are arranged relative to a subset of data tone locations of the plurality of data tone locations according to a PRT sequence corresponding to a set of allocated frequency resources; and transmit a data transmission using a waveform based at least in part on the resource allocation. Numerous other aspects are provided.