Fragmented Frequency Waveform Generation for PAPR Reduction
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Solution Overview
Problem
Current wireless communication systems face challenges in managing peak-to-average power ratio (PAPR) when transmitting waveforms over fragmented frequency resources, which can degrade error vector magnitude (EVM) and increase power consumption.
Innovation Solution
The method involves selecting appropriate schemes for generating waveforms that account for unavailable frequency resources, such as Null and Shift, Null and Append, or Null only schemes, based on criteria like modulation order, gap sizes, and UE capabilities to optimize PAPR reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If waveform is transmitted over fragmented frequency resources, then frequency resource utilization is improved, but peak-to-average power ratio increases
Solution Approach 1:
The patent segments the frequency resources into available and unavailable portions, and applies different mapping schemes to different segments. The waveform symbols are mapped to available frequency resources while avoiding unavailable resources, creating a segmented approach to resource allocation that maintains low PAPR while utilizing fragmented spectrum efficiently
Solution Approach 2:
The patent dynamically selects between different mapping schemes (first scheme, second scheme, third scheme) based on the characteristics of the fragmented frequency resources and system conditions. This dynamic adaptation allows the system to optimize PAPR reduction for each specific fragmentation scenario while maintaining good resource utilization
2Productivity
If waveform is transmitted over fragmented frequency resources, then frequency resource utilization is improved, but error vector magnitude degrades
Solution Approach 1:
The patent segments the frequency resources and applies different mapping schemes to different segments. By carefully managing how waveform symbols are mapped to available frequency resources and how reference signals are positioned, the patent maintains signal quality and minimizes EVM degradation despite the fragmented resource allocation
Solution Approach 2:
The patent incorporates feedback mechanisms where the receiver detects the mapping scheme used and provides feedback to the transmitter. This feedback loop allows the system to maintain accurate signal reconstruction and minimize EVM by adapting to the specific fragmentation pattern observed in the channel
3Use of energy by stationary object
If PAPR reduction schemes are applied to fragmented frequency resources, then power consumption is reduced, but waveform generation complexity increases
Solution Approach 1:
The patent dynamically selects between different mapping schemes based on the fragmentation characteristics and system conditions. This dynamic approach allows the system to use simpler schemes when appropriate and more sophisticated schemes only when necessary, balancing complexity reduction with power consumption management
Solution Approach 2:
The patent changes the mapping parameters and scheme selection based on the specific fragmentation pattern and system requirements. By adjusting these parameters dynamically, the patent reduces the average complexity of waveform generation while maintaining effective PAPR reduction, avoiding the need for always using the most complex scheme
Data Source
AI summary
Certain aspects of the present disclosure provide a method of wireless communication at a transmitting device, generally including selecting, based on one or more criteria, a scheme for generating a waveform that accounts for unavailable frequency resources within an allocation of resource elements (REs), obtaining a sequence of frequency domain symbols, generating the waveform by mapping at least some of the sequence of frequency domain symbols to REs within the allocation according to the selected scheme, and outputting the waveform for transmission.