Reference Signal Sequence Configuration for PAPR Reduction
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Solution Overview
Problem
In multi-input multi-output systems, the configuration of reference signals for antenna ports allocated to a terminal often results in high peak-to-average power ratio (PAPR), leading to suboptimal transmission performance due to sequence repetition in the frequency domain.
Innovation Solution
Generating and using different sequences for reference signals corresponding to each antenna port, ensuring that these sequences are distinct and randomly distributed to avoid repetition, thereby reducing PAPR and improving transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same sequence is used for reference signals of multiple antenna ports, then device complexity is reduced, but PAPR increases and transmission performance deteriorates
Solution Approach 1:
The patent applies local quality by making each antenna port's reference signal have a distinct sequence characteristic. Specifically, different antenna ports use sequences with different initialization values (nSCID), creating local differentiation in sequence properties while maintaining overall system coherence. This resolves the contradiction by accepting increased sequence generation complexity to achieve better transmission performance through reduced PAPR.
Solution Approach 2:
The patent changes the initialization parameter (nSCID) of the sequence generation function for different antenna ports. By varying this parameter, the system generates different sequences for different antenna ports, which reduces sequence repetition in the frequency domain and lowers PAPR. This parameter change approach maintains manageable device complexity while significantly improving transmission performance.
2Reliability
If different sequences are used for reference signals of different antenna ports, then PAPR is reduced and transmission performance is improved, but device complexity increases
Solution Approach 1:
The patent uses parameter changes by modifying the initialization value (nSCID) in the sequence generation function. This allows different antenna ports to use different sequences through a simple parameter variation rather than complex sequence design. The network device configures different nSCID values for different antenna ports, which efficiently reduces PAPR while keeping the sequence generation mechanism itself relatively simple.
Solution Approach 2:
The patent applies universality by using a single sequence generation function for all antenna ports, differing only in the initialization parameter. This universal generation mechanism handles multiple antenna ports with different sequence requirements without requiring separate generation algorithms for each port, thereby limiting the increase in device complexity while achieving the performance benefits of different sequences.
3Reliability
If sequences are randomly distributed to avoid repetition, then PAPR is reduced, but sequence configuration complexity increases
Solution Approach 1:
The patent achieves random distribution effect through parameter changes by varying the initialization value (nSCID) for different antenna ports. This creates sufficient randomness in sequence values without requiring complex random generation algorithms. The network device simply configures different nSCID parameters, which efficiently reduces PAPR while keeping configuration complexity manageable through a systematic parameter assignment approach.
Data Source
AI summary
This application discloses reference signal and sequence configuration methods and apparatuses for wireless communications. In an implementation, a method includes: generating at least two reference signals, where the at least two reference signals are reference signals corresponding to at least two antenna ports allocated by a network device to a same terminal, the at least two reference signals are reference signals of a same type, the at least two reference signals include a first reference signal and a second reference signal, and a sequence of the first reference signal is different from a sequence of the second reference signal, and sending the at least two reference signals.