Dynamic Reserved Resources for Wireless PAPR Reduction
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Solution Overview
Problem
Conventional methods for reducing peak-to-average power ratio (PAPR) in wireless communication systems using frequency domain resource reservation are inflexible and increase complexity at the receiving side, especially in systems with flexible resource scheduling like LTE and NR.
Innovation Solution
Determine reserved resources based on unscheduled frequency domain resources in transmission and guard bandwidths, using a communication apparatus to generate a peak suppressing signal, without modifying the receiving side's behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed reserved frequency domain resource is used for PAPR reduction, then the PAPR can be reduced by superimposing a peak suppressing signal, but the flexibility of resource scheduling is reduced and the complexity of the receiving side increases
Solution Approach 1:
The patent applies the dynamics principle by transitioning from a fixed reserved frequency domain resource to a dynamic selection mechanism. The transmitting side dynamically selects reserved resources from available unscheduled resources based on current scheduling conditions, while the receiving side adaptively identifies these dynamically selected resources through detection of resource indication information. This dynamic approach maintains PAPR reduction effectiveness while restoring resource scheduling flexibility.
Solution Approach 2:
The patent implements parameter changes by modifying the resource allocation parameters from fixed to variable. The reserved resources are no longer predetermined but are selected based on scheduling parameters such as available unscheduled resources, channel conditions, and traffic requirements. This parameter change enables the system to adapt resource allocation to varying operational conditions while maintaining the PAPR reduction function.
2Reliability
If a fixed reserved frequency domain resource is used for PAPR reduction, then the peak suppressing signal can be generated effectively, but the complexity of the receiving side increases
Solution Approach 1:
The patent applies the self-service principle by enabling the receiving side to autonomously identify and locate the reserved resources through detection of resource indication information transmitted by the base station. Instead of requiring complex configuration or pre-knowledge of fixed reserved resources, the receiving side independently determines the location of reserved resources based on the indicated information, thereby reducing complexity while maintaining effectiveness.
3Reliability
If clipping technology is used to reduce PAPR, then the power amplifier can be protected from damage, but the signal quality may be degraded
Solution Approach 1:
The patent introduces a peak suppressing signal as an intermediary element to reduce PAPR. Instead of directly clipping the signal waveform which causes distortion, a separate peak suppressing signal is generated and superimposed on the original signal. This intermediary approach reduces the instantaneous peak power while maintaining the original signal characteristics, thereby protecting the power amplifier with minimal impact on signal quality.
Data Source
AI summary
Embodiments of this application disclose a method for reducing a peak-to-average power ratio PAPR, and a communication apparatus, and are applied to a transmitting system including a power amplifier. In the method, a reserved resource may be determined based on a first unscheduled resource in transmission bandwidth and/or a second unscheduled resource in guard bandwidth, and a fixed reserved resource in a conventional technology does not need to be used. Therefore, flexibility of determining the reserved resource can be improved, and flexibility of reducing a peak-to-average power ratio PAPR in a frequency domain resource reservation TR manner can further be improved.