DMRS Sequence Generation for Low PAPR in 5G NR
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Solution Overview
Problem
The 5G New Radio (NR) system faces challenges in frequency ranges above 52.6 GHz, including higher phase noise, larger propagation loss, lower power amplifier efficiency, and stringent power spectral density regulatory requirements, which affect DMRS transmission and cause high PAPR issues.
Innovation Solution
The method involves determining a sequence group index based on parameters such as physical channel identity, scrambling identity, and cell identity, and using this index to generate and transmit DMRS sequences over multiple RS ports, thereby improving flexibility and reducing PAPR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If DMRS sequences are transmitted in frequency ranges above 52.6 GHz, then the 5G NR system can support wide range services and large bandwidths, but the transmission suffers from higher phase noise, larger propagation loss, and high PAPR issues
Solution Approach 1:
The patent applies parameter changes by determining sequence group indices and scrambling identities based on multiple parameters including physical channel identity, cell identity, and slot number. This dynamic parameter adjustment optimizes DMRS sequence generation for high-frequency transmission, reducing PAPR and improving transmission reliability in mmWave and higher frequency bands
2Ease of manufacture
If traditional DMRS sequence generation methods are used, then the implementation is simple, but the PAPR is high causing transmission issues in high-frequency bands
Solution Approach 1:
The patent implements dynamics by making the sequence group index and scrambling identity dynamic rather than static. The sequence group index is determined based on physical channel identity, cell identity, and slot number, while the scrambling identity varies with layer index and other parameters. This dynamic approach reduces PAPR without significantly complicating the generation process
Solution Approach 2:
The patent applies segmentation by dividing the DMRS sequence generation into multiple independent determination steps: first determining the sequence group index based on physical channel and cell identities, then determining the scrambling identity based on layer index and other parameters. This segmented approach maintains implementation simplicity while achieving low PAPR through coordinated parameter selection
Data Source
AI summary
Embodiments of the present disclosure relate to methods, devices and computer readable media for communication. A method comprises determining, at a first device, a first parameter for determination of a sequence group index based on at least one of the following: a second parameter indicating an identity associated with a physical channel between the first device and a second device, a third parameter indicating a scrambling identity, and a fourth parameter indicating a cell identity; determining the sequence group index based on the first parameter; generating, at least based on the sequence group index, a Demodulation Reference Signal (DMRS) sequence to be transmitted to the second device; and transmitting the generated DMRS sequence to the second device over the physical channel. Embodiments of the present disclosure can enable DMRS transmission with low Peak to Average Power Ratio (PAPR) and high flexibility.