Reference Signal Configuration Reducing PAPR via Unique Sequences
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Solution Overview
Problem
In multi-input multi-output communication systems, the configuration of reference signals is crucial for channel estimation, but existing methods often result in high peak-to-average power ratio (PAPR), which affects transmission performance due to sequence repetition in the frequency domain.
Innovation Solution
Generating and using different reference signals with distinct sequences for each antenna port, ensuring that reference signals mapped to the same resource unit are unique, thereby increasing sequence randomness and reducing PAPR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same reference signal sequence is used for multiple antenna ports, then device complexity is reduced, but peak-to-average power ratio increases and transmission performance deteriorates
Solution Approach 1:
The patent applies local quality by making each antenna port have its own unique reference signal sequence characteristics. Specifically, different antenna ports use different base sequences or different cyclic shifts, creating localized differences in sequence properties at each antenna port while maintaining overall system coherence. This resolves the contradiction by ensuring each location (antenna port) has optimized local sequence properties rather than using a uniform global sequence.
Solution Approach 2:
The patent changes key parameters of the reference signal sequences including sequence length, base sequence index, and cyclic shift values for different antenna ports. By dynamically adjusting these parameters, the system achieves different sequence characteristics for each antenna port, which reduces PAPR and improves transmission performance while maintaining manageable complexity through systematic parameter management.
2Reliability
If different reference signal sequences are used for each antenna port, then transmission performance is improved by reducing PAPR, but device complexity increases
Solution Approach 1:
The patent segments the reference signal configuration into distinct components for each antenna port, including separate base sequence selection and cyclic shift assignment. This segmentation allows independent optimization of each antenna port's reference signal to reduce PAPR, while the modular structure keeps complexity manageable by treating each port as an independent configuration unit rather than managing a single complex global sequence.
Solution Approach 2:
The patent introduces dynamic parameters such as variable cyclic shifts and configurable base sequence indices that can be adjusted based on channel conditions and antenna port requirements. This dynamic approach enables optimal PAPR reduction for each antenna port while maintaining flexibility in complexity management through adaptive configuration rather than fixed complex structures.
3Productivity
If reference signals are mapped to the same resource unit, then resource efficiency is improved, but sequence repetition occurs in frequency domain leading to high PAPR
Solution Approach 1:
The patent applies asymmetry by assigning different sequence characteristics (different base sequences or different cyclic shift values) to reference signals mapped on the same resource unit for different antenna ports. This creates asymmetric sequence properties in the frequency domain that prevent repetitive patterns, thereby reducing PAPR while maintaining resource efficiency through shared time-frequency resources.
Data Source
AI summary
This disclosure discloses signal configuration methods and apparatuses. In an implementation, a method comprises: generating at least two reference signals of a same type corresponding to at least two antenna ports indicated to a terminal device, wherein the at least two reference signals comprise a first reference signal and a second reference signal, wherein a first sequence of the first reference signal is obtained based on a first initialization factor determined based on an index of a first code division multiplexing (CDM) group, and wherein a second sequence of the second reference signal different from the first sequence is obtained based on a second initialization factor determined based on an index of a second CDM group; and transmitting the at least two reference signals.