DM-RS Sequence Generation for 5G PAPR Reduction
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G networks, face challenges in managing peak-to-average power ratio (PAPR) in Demodulation Reference Signals (DM-RS), which leads to increased power amplifier saturation, out-of-band emissions, and reduced system efficiency.
Innovation Solution
The system generates DM-RS sequences based on the capability of mobile devices, using different scrambling identifiers and code division multiplexing groups to reduce PAPR, allowing for scheduling of transmission ranks greater than 2 without power backoff, thereby enhancing link and system throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional DM-RS sequences are used in 5G networks, then the reference signal can be generated with standard methods, but the peak-to-average power ratio increases causing power amplifier saturation and out-of-band emissions
Solution Approach 1:
The patent changes the initialization parameters of the pseudo-random sequence generator used for DM-RS generation. Specifically, it modifies the cinit parameter to use different scrambling identifiers (nSCID) and code division multiplexing groups, which transforms the sequence properties to achieve lower PAPR while maintaining the reference signal functionality.
Solution Approach 2:
The patent applies different sequence generation parameters to different antenna ports and code division multiplexing groups. By locally optimizing the sequence properties for each port/group combination, it achieves reduced PAPR in specific locations without affecting the overall system complexity.
2Object-generated harmful factors
If power backoff is applied to reduce PAPR, then out-of-band emissions are reduced, but transmission power is reduced and system throughput decreases
Solution Approach 1:
The patent converts the harmful high PAPR characteristic into a benefit by designing sequences with inherently low PAPR properties. Instead of using power backoff to mitigate the harm, the invention redesigns the sequence generation to prevent the harmful effect from occurring in the first place, thereby maintaining full transmission power and throughput.
3Productivity
If transmission ranks greater than 2 are scheduled, then system capacity increases, but PAPR increases causing power amplifier saturation
Solution Approach 1:
The patent segments the DM-RS sequences into different code division multiplexing groups and assigns different scrambling identifiers to each group. This segmentation allows multiple transmission layers (ranks > 2) to be multiplexed without their sequences interfering constructively to create high PAPR, enabling high system capacity without power amplifier saturation.
Data Source
AI summary
Facilitating generation of demodulation reference signals in advanced networks (e.g., 4G, 5G, 6G, and beyond) is provided herein. Operations of a system can comprise evaluating a capability of a mobile device and generating a demodulation reference signal sequence for the mobile device based on the capability of the mobile device. The demodulation reference signal sequence can be a first type based on the capability being a first capability and can be a second type based on the capability being a second capability.