Reference Signal Pattern Offset for PAPR Suppression
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Solution Overview
Problem
When the reference signal density is high, the peak-to-average power ratio (PAPR) suppression performance of tone reservation (TR) technology is low, posing an urgent challenge to improve PAPR suppression performance.
Innovation Solution
A communication method and apparatus that introduce a new reference signal pattern, including a first and a second reference signal sub-pattern, where the second sub-pattern is an offset of the first sub-pattern in the time or frequency domain, to unevenly distribute reference signals across the bandwidth, thereby enhancing PAPR suppression performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference signal density is increased to improve channel estimation accuracy, then decoding performance is improved, but PAPR suppression performance deteriorates
Solution Approach 1:
The bandwidth is divided into multiple subcarrier groups, and different reference signal patterns are applied to different groups. This segmentation allows the system to maintain high reference signal density for channel estimation while creating uneven distribution patterns that improve PAPR suppression performance.
Solution Approach 2:
Different reference signal patterns are applied to different subcarrier groups based on local requirements. Some groups use patterns optimized for channel estimation, while others use patterns optimized for PAPR suppression, allowing each region to have the quality needed for its specific function.
2Measurement precision
If reference signals are evenly distributed across bandwidth to improve decoding performance, then channel estimation accuracy is improved, but PAPR suppression performance deteriorates
Solution Approach 1:
The bandwidth is segmented into multiple subcarrier groups with different reference signal patterns. This allows the system to move away from uniform distribution while maintaining adequate coverage for decoding performance through the combined effect of multiple patterns across groups.
Solution Approach 2:
The patent introduces asymmetric reference signal patterns where the second pattern is an offset version of the first pattern in time and/or frequency domain. This asymmetry creates uneven distribution that improves PAPR suppression while the combination of patterns across subcarrier groups maintains overall coverage for decoding performance.
3Reliability
If reserved tones are selected from subcarriers to suppress PAPR, then PAPR suppression performance is improved, but reference signal density decreases
Solution Approach 1:
By dividing the bandwidth into subcarrier groups and applying different patterns to each group, the system can maintain high reference signal density in terms of overall quantity while creating local regions with appropriate reserved tones for PAPR suppression.
Solution Approach 2:
The patent changes the spatial distribution parameters of reference signals by introducing offset patterns across subcarrier groups. This allows the system to maintain the same number of reference signals (density) while changing their arrangement to improve PAPR suppression performance.
Data Source
AI summary
The disclosure includes a communication method and a communication apparatus. The communication method includes the communication apparatus determining to use a reserved tone, determining a reference signal pattern and a tone reservation (TR) pattern, and performing data transmission based on the reference signal pattern and the TR pattern. The reference signal pattern includes a first reference signal sub-pattern and a second reference signal sub-pattern, and the second reference signal sub-pattern is an offset of the first reference signal sub-pattern in time domain and/or frequency domain. According to the method, a reference signal pattern having a plurality of different sub-patterns may be provided, so that reference signals are unevenly distributed on a bandwidth. In this way, even if a reference signal density is high, a large secondary peak value of a kernel time domain signal generated on a subcarrier used as a reserved tone can be avoided, thereby improving peak-to-average power ratio (PAPR) suppression performance.