Low PAPR Uplink Reference Signal Sequence Design
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Solution Overview
Problem
Current mobile communication systems face challenges in supporting high-speed data traffic, increased user connections, low latency, and energy efficiency, particularly in next-generation wireless communication systems.
Innovation Solution
A method for transmitting a demodulation reference signal using a low Peak to Average Power Ratio (PAPR) sequence, specifically a length-6 sequence with 8-phase shift keying (PSK) symbols, and applying Frequency Domain Spectrum Shaping (FDSS) filter, with cyclic shifting and Frequency Division Multiplexing (FDM) across two antenna ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional reference signal sequences are used for uplink control signal transmission, then the transmission can be performed with standard sequences, but the Peak to Average Power Ratio (PAPR) performance deteriorates leading to reduced power efficiency and increased interference
Solution Approach 1:
The patent applies parameter changes by modifying the reference signal sequence parameters to achieve low PAPR. Specifically, it uses length-6 sequences with 8-PSK symbols and applies Frequency Domain Spectrum Shaping (FDSS) filtering to transform the spectral characteristics of the sequence, thereby reducing peak power while maintaining transmission reliability
Solution Approach 2:
The patent applies local quality by using different sequence structures for different parts of the signal transmission. It employs specific length-6 sequences with 8-PSK modulation for reference signals requiring low PAPR, while other data transmissions can use conventional sequences, optimizing each component according to its specific requirements
2Productivity
If high data transfer rates are implemented to support next-generation wireless communication, then the throughput increases, but the system complexity and resource requirements increase
Solution Approach 1:
The patent applies partial action by implementing low PAPR sequences only for reference signal transmissions rather than all uplink transmissions. This selective approach provides PAPR optimization where most needed (for control signals and reference signals) without unnecessarily complicating the entire system architecture
Solution Approach 2:
The patent creates a universal low PAPR sequence structure using length-6 sequences with 8-PSK symbols that can be applied across multiple uplink transmission scenarios including PUCCH, PUSCH, and random access signals, providing a multi-functional solution that reduces complexity by using a unified approach
Data Source
AI summary
Disclosed herein is a method for transmitting a demodulation reference signal for an uplink control signal in a wireless communication system. Specifically, the method performed by a terminal includes: generating a low peak to average power ratio (PAPR) sequence based on a length-6 sequence; generating a sequence used for the demodulation reference signal based on the low PAPR sequence; and transmitting, to a base station, the demodulation reference signal based on the sequence used for the demodulation reference signal, in which the length-6 sequence has an 8-phase shift keying (PSK) symbol as each element of a sequence.