Wireless Reference Signal Subblock Segmentation for Low PAPR
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Solution Overview
Problem
Current wireless communication systems face challenges in achieving low peak-to-average power ratio (PAPR)/cubic metric (CM) characteristics, which are essential for efficient signal transmission and battery consumption, particularly in next-generation multimedia mobile communication systems where high PAPR/CM characteristics can lead to deterioration in channel estimation performance and increased battery consumption.
Innovation Solution
The method involves generating and transmitting signal sequences with low PAPR/CM characteristics, specifically for reference signals and synchronization signals, by dividing the sequences into subblocks and applying cyclic shifts or phase modulation on a subblock or carrier basis, allowing for efficient mapping and transmission in wireless communication systems like 3GPP LTE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If reference signals are transmitted together with data subcarriers to increase data transfer amount, then data transfer capacity is improved, but channel estimation performance deteriorates due to decreased reference signal density
Solution Approach 1:
The reference signal sequence is divided into multiple subblocks, each mapped to different subcarrier groups. This segmentation allows the reference signals to be distributed across the frequency spectrum while maintaining adequate density in each segment, thus preserving channel estimation performance while enabling simultaneous data transmission on other subcarriers.
Solution Approach 2:
The patent maps reference signal subblocks to different frequency dimensions (subcarrier groups) rather than concentrating them in a single dimension. This multi-dimensional distribution approach increases overall data transfer capacity while maintaining reference signal density across different frequency segments for accurate channel estimation.
2Measurement precision
If conventional signal sequences are used for reference signals, then channel estimation capability is improved through high detection capability, but peak-to-average power ratio (PAPR)/cubic metric (CM) characteristics deteriorate leading to increased battery consumption
Solution Approach 1:
The patent applies phase rotation and cyclic shifting parameters to the reference signal sequences, transforming them into subblocks with different phase characteristics. These parameter changes reduce the PAPR/CM values while preserving the autocorrelation and cross-correlation properties necessary for accurate channel estimation, thereby reducing mobile station battery consumption.
3Measurement precision
If reference signal density is increased to improve channel estimation capability, then channel estimation performance is improved, but data transfer capacity decreases due to fewer available data subcarriers
Solution Approach 1:
By segmenting the reference signal into multiple subblocks that are mapped to different subcarrier groups, the patent achieves comprehensive frequency domain coverage for channel estimation without requiring high density in any single group. This allows data to be transmitted on remaining subcarriers, maintaining data transfer capacity while preserving estimation capability.
Data Source
AI summary
Provided is a method and device for signal transmission having good PAPR/CM characteristics. With regard to one aspect of said method, the method for transmitting a reference signal in a wireless communication signal comprises a step wherein a reference signal sequence is generated, a step wherein said reference signal sequence is divided with respect to each of multiple sub-blocks, a step wherein each of said plurality of divided reference signal sequence is subject to circular shifting, and a step wherein said plurality of circular shifted reference signals are transmitted via said plurality of sub-blocks.