Sequence Generating Apparatus Reduces DMRS PAPR via CDM Group Initialization
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Solution Overview
Problem
In multiple-input multiple-output (MIMO) systems, configuring a reference signal sequence to minimize interference and reduce peak to average power ratio (PAPR) in symbol sending processes is challenging.
Innovation Solution
A method and apparatus for generating a sequence used to configure a reference signal, where the initialization factor is calculated based on specific parameters such as a port number or CDM group identity, to avoid using the same sequence for different CDM groups and reduce PAPR of DMRS symbols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same sequence is used for different CDM groups, then device complexity is reduced, but interference occurs between different CDM groups
Solution Approach 1:
The patent applies local quality by making the sequence initialization factor dependent on the CDM group identity. Different CDM groups use different initialization factors (cinit values) in the sequence generation formula, creating locally differentiated sequences for each CDM group while maintaining the overall system structure. This resolves the contradiction by introducing minimal complexity only where needed (in the initialization parameter) to prevent interference.
Solution Approach 2:
The patent changes the initialization parameter (cinit) of the sequence generation based on CDM group identity. By modifying this key parameter according to the CDM group, the system generates distinct sequences for different groups without changing the overall sequence structure or generation mechanism, thus preventing interference while maintaining simplicity.
2Ease of manufacture
If conventional sequence generation is used, then implementation is simple, but peak to average power ratio (PAPR) of DMRS symbols is high
Solution Approach 1:
The patent modifies the initialization factor parameter in the sequence generation formula to reduce PAPR. By using a specific calculation method for cinit that incorporates the CDM group identity and other parameters, the generated sequences have lower peak power characteristics while maintaining the same generation structure and implementation complexity.
3Reliability
If reference signal sequence is configured to minimize interference, then communication reliability is improved, but sequence configuration complexity increases
Solution Approach 1:
The patent applies local quality by differentiating sequences only at the initialization factor level for different CDM groups. This localized differentiation ensures reliable separation between groups without requiring complex overall reconfiguration of the sequence generation system, thus improving reliability with minimal complexity increase.
Data Source
AI summary
This application discloses a sequence generating method and apparatus, and relates to the field of communications technologies, to resolve a problem that a PAPR of a DMRS symbol is higher than that of a data symbol. An initialization factor of a first sequence is obtained, where the initialization factor is associated with a first parameter, and the first sequence is generated based on the initialization factor. In addition, the first parameter is a port number, or the first parameter is a code division multiplexing CDM group identity.