PUCCH Sequence Mapping for PAPR Reduction
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in transmitting uplink channels, particularly in shared spectrum environments where peak to average power ratio (PAPR) and cube metric (CM) values are high, affecting transmission performance.
Innovation Solution
The method involves configuring a physical uplink control channel (PUCCH) sequence to be repeatedly mapped across resource blocks (RBs) in an interlace, with varying cyclic shift values based on RB indices and applying phase shifts to optimize PAPR and CM performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PUCCH sequence is repeatedly mapped across resource blocks in an interlace with varying cyclic shift values, then PAPR and CM values are reduced, but transmission complexity increases
Solution Approach 1:
The patent applies different cyclic shift values to different resource blocks within the interlace structure. Specifically, each resource block is assigned a cyclic shift value based on its index, creating local variations in signal properties that reduce PAPR and CM values while maintaining overall system functionality
Solution Approach 2:
The patent divides the uplink transmission into multiple resource blocks organized in an interlace structure, where each resource block can be independently configured with specific cyclic shift values. This segmentation allows for localized optimization of transmission parameters across different frequency resources
2Productivity
If phase shifts are applied to optimize PAPR and CM performance, then transmission efficiency improves, but computational complexity increases
Solution Approach 1:
The patent systematically varies phase shift parameters across different resource blocks and time instances. By changing these parameters in a controlled manner based on resource block indices and predefined patterns, the system optimizes PAPR and CM values without requiring complex real-time calculations
3Reliability
If cyclic shift values vary based on RB index multiplied by delta value, then PAPR reduction is achieved, but signal processing complexity increases
Solution Approach 1:
The patent implements periodic variation of cyclic shift values across resource blocks using a systematic formula where the cyclic shift for each resource block is determined by its index multiplied by a delta value. This periodic pattern creates predictable signal variations that reduce PAPR while maintaining manageable processing complexity through regularity
Solution Approach 2:
The patent changes the cyclic shift parameter systematically across different resource blocks by multiplying the resource block index by a delta value. This parameter variation creates diverse signal characteristics across the interlace, effectively reducing PAPR and improving transmission reliability
Data Source
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AI summary
A method and device for transmitting/receiving a signal in a wireless communication system according to an embodiment of the present invention may comprise: repeatedly mapping a PUCCH sequence to each of resource blocks (RBs) in an interlace; and transmitting a PUCCH on the interlace, wherein the CS value of the PUCCH sequence may vary on the basis of values determined by multiplying RB indexes of the respective RBs by a Δ value.