Reference Signal Sequence Generation for 5G
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems, particularly in 5G and New Radio (NR) technologies, face inefficiencies due to the mismatch in peak-to-average ratio (PAPR) between pi/2-BPSK modulated data and Zadoff-Chu or QPSK-based reference signals, limiting the utilization of power adjustments and affecting power amplifier efficiency.
Innovation Solution
The method involves generating specific sequences for reference signals using deterministic and random generation methods, filtering them based on PAPR and cross-correlation thresholds, and employing these sequences in conjunction with pi/2-BPSK modulation to optimize PAPR and cross-correlation properties, ensuring the sequences are suitable for transmission on multiple subcarriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Zadoff-Chu or QPSK-based reference signals are used, then reference signal generation is standardized, but PAPR mismatch with pi/2-BPSK modulated data occurs, reducing power amplifier efficiency
Solution Approach 1:
The patent changes the parameters of reference signals by generating sequences with specific PAPR properties that match pi/2-BPSK modulated data. This involves selecting or generating sequences with controlled amplitude characteristics to achieve PAPR alignment, thereby improving power amplifier efficiency while maintaining reliable reference signal generation
Solution Approach 2:
The patent applies local quality by optimizing specific properties of reference signal sequences rather than changing the entire signal structure. By focusing on PAPR characteristics of individual sequences and selecting those that match the data modulation, the system achieves localized optimization that resolves the efficiency mismatch without compromising overall system reliability
2Ease of manufacture
If traditional reference signal sequences are used, then implementation is simple, but inter-cell interference is high due to poor cross-correlation properties
Solution Approach 1:
The patent uses copying by generating reference signal sequences through systematic methods that replicate desirable correlation properties. By creating sequences with controlled cross-correlation characteristics through deterministic or random generation processes, the system reduces inter-cell interference while maintaining implementation simplicity
Solution Approach 2:
The patent applies preliminary action by pre-generating and selecting reference signal sequences with optimized cross-correlation properties before transmission. This preliminary selection ensures that sequences with low inter-cell interference are chosen in advance, reducing harmful effects without complicating the transmission process
Data Source
AI summary
Methods, systems, and devices for generating sequences for reference signals in mobile communication technology are described. An exemplary method for wireless communication includes transmitting data, which is modulated using a pi/2-binary phase shift keying (BPSK) modulation, and a reference signal using a plurality of subcarriers, where the reference signal comprises a sequence from a subset of sequences that contains 30 sequences, each with a predetermined length, and where the subset of sequences include at least a first number of fixed sequences and a second number of selected sequences. The method further enables constructing the sequences, which have low peak-to-average power ratio (PAPR) properties, for sequence lengths N=6, 12, 18, 24 and 30.