DMRS Sequence Generation for Low PAPR in NR Uplink
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In New Radio (NR) mobile communication systems, the high peak-to-average power ratios (PAPRs) of demodulation reference signals (DMRS) lead to poor uplink coverage performance due to the use of Zadoff-Chu or pseudo-noise sequences, resulting in increased power consumption and reduced demodulation performance.
Innovation Solution
A communication device generates a target reference signal with a lower PAPR by employing specific sequence characteristics, such as auto-correlation and cross-correlation values, to improve power amplification efficiency and demodulation performance, and transmits this signal based on indication information from a second communication device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a DMRS sequence is generated using a Zadoff-Chu sequence or a pseudo-noise sequence, then the reference signal can be generated with good auto-correlation and cross-correlation properties, but the peak-to-average power ratio (PAPR) of the DMRS becomes higher than that of data symbols, resulting in poor uplink coverage performance
Solution Approach 1:
The patent changes the fundamental parameter of the reference signal sequence generation method by switching from traditional Zadoff-Chu or pseudo-noise sequences to a new sequence construction method that inherently produces lower PAPR. This is achieved by generating the DMRS sequence through a specific mathematical transformation process that ensures the resulting sequence has both good correlation properties and reduced peak power, thereby resolving the contradiction between reliability and energy efficiency.
Solution Approach 2:
Instead of trying to reduce the PAPR of traditional ZC or PN sequences through signal processing techniques, the patent inverts the approach by directly constructing the sequence with low PAPR properties from the beginning. The sequence is generated by transforming data symbols through a specific process that guarantees low PAPR, rather than starting with high PAPR sequences and attempting to mitigate them.
2Reliability
If a DMRS sequence is generated using a Zadoff-Chu sequence or a pseudo-noise sequence, then the reference signal can be generated with good auto-correlation and cross-correlation properties, but the power amplification efficiency decreases and power consumption increases
Solution Approach 1:
The patent fundamentally changes the sequence generation parameter by adopting a new mathematical construction method that produces sequences with inherently lower PAPR. This parameter change ensures that the reference signal maintains good demodulation performance through preserved correlation properties while simultaneously reducing peak power, which improves power amplification efficiency and reduces overall power consumption in the transmission system.
3Reliability
If a DMRS sequence is generated using a Zadoff-Chu sequence or a pseudo-noise sequence, then the reference signal can be generated with good auto-correlation and cross-correlation properties, but the power amplification efficiency of the signal transmit end decreases
Solution Approach 1:
The patent applies parameter changes by transforming the sequence generation approach to produce low PAPR sequences directly. This ensures that the reference signal maintains the necessary correlation properties for accurate channel estimation while having reduced peak power characteristics, thereby improving power amplification efficiency without compromising channel estimation performance.
Data Source
Figure 1
Figure 2a
Figure 2b
AI summary
This disclosure provides a transmission method and a first communication device. The method includes: transmitting, by a first communication device, a target reference signal that belongs to a first type of reference signal in a case that the first communication device receives indication information from a second communication device and the indication information indicates transmission of the first type of reference signal, where a reference signal sequence of the first type of reference signal is generated based on a first characteristic.