Reference Signal Arrangement for PAPR Reduction
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Solution Overview
Problem
Current wireless communication systems face challenges in reducing the peak-to-average power ratio (PAPR) of demodulation reference signals, which can lead to unequal transmission power compared to data signals, causing detection and decoding issues due to higher PAPR properties of reference signals.
Innovation Solution
The method involves generating a Zadoff-Chu sequence, performing frequency-domain and time-domain cyclic shifts, and arranging the resulting reference symbol sequence across physical resource blocks to achieve a desired length, ensuring the PAPR of the reference signal is closer to that of the data signal, using spectral extension and shaping techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference signals are transmitted with higher power to improve detection performance, then detection accuracy is improved, but PAPR increases causing power amplifier inefficiency
Solution Approach 1:
The patent applies parameter changes by modifying the cyclic shift values applied to reference signals based on their resource element positions. Specifically, different cyclic shift amounts are used for reference signals in different physical resource blocks, which changes the temporal and spectral characteristics of the reference signals to reduce PAPR while maintaining detection accuracy
Solution Approach 2:
The patent implements local quality by applying position-dependent cyclic shifts to reference signals. Each reference signal experiences a tailored cyclic shift based on its specific resource element location, creating localized optimizations that reduce PAPR in specific regions while maintaining overall detection performance
2Ease of operation
If reference signals use standard allocation to simplify implementation, then ease of operation is improved, but PAPR properties deteriorate causing unequal transmission power compared to data signals
Solution Approach 1:
The patent modifies the cyclic shift parameter based on resource element position to achieve better PAPR properties. The cyclic shift amount is calculated as a function of the resource element index, transforming the reference signal characteristics to match data signal power levels while maintaining implementation feasibility through systematic parameter adjustment
Data Source
AI summary
This document discloses a solution for generating a reference symbol sequence for a radio transmitter. According to an aspect, a method comprises in a transmitter apparatus: generating a Zadoff-Chu sequence for a reference signal; performing a frequency-domain cyclic shift on the Zadoff-Chu sequence; extending the cyclically shifted sequence to a desired length; performing a time-domain cyclic shift on the sequence having the desired length, resulting in a reference symbol sequence; arranging the reference symbol sequence to at least some resource elements of a set of physical resource blocks, and causing transmission of the reference symbol sequence in the set of physical resource blocks.