DMRS CDM Group Expansion for More Orthogonal Ports
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Solution Overview
Problem
Current wireless communication systems face challenges in supporting a larger number of orthogonal DMRS ports without increasing the DMRS overhead.
Innovation Solution
The proposed solution involves expanding the CDM groups to include more orthogonal OCCs, where the number of frequency domain elements in each expanded OCC is doubled compared to the legacy OCCs, while maintaining orthogonality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of orthogonal DMRS ports is increased to meet current or future communication requirements, then the system capacity is improved, but the DMRS overhead increases
Solution Approach 1:
The patent expands the CDM group by increasing the frequency domain elements from 2 to 4, effectively adding a dimension to the OCC structure. This allows more orthogonal OCCs (from 2 to 4 per CDM group) without requiring additional time or frequency resources, thereby doubling the DMRS port capacity while maintaining the same DMRS overhead.
2Quantity of substance
If legacy CDM groups are used with limited OCCs, then the DMRS overhead is kept low, but the number of supported orthogonal DMRS ports is limited
Solution Approach 1:
The patent changes the parameter of frequency domain elements in OCCs from 2 to 4, which transforms the mathematical properties of the OCCs. This parameter change enables the generation of more orthogonal OCCs within the same CDM group, allowing support for more DMRS ports without increasing the overall DMRS overhead.
Data Source
AI summary
The present disclosure relates to demodulation reference signal (DMRS) design with code division multiplexing (CDM) group expansion. A network device may be configured to generate a DMRS and send the DMRS to a wireless device. The DMRS may be coded with one of a plurality of expanded orthogonal cover codes (OCCs) belonging to an expanded CDM group. The expanded CDM group may be generated by expanding a legacy CDM group including a plurality of legacy OCCs. The number of frequency domain elements in each of the plurality of expanded OCCs may be expanded as twice the number of frequency domain elements in each of the plurality of legacy OCCs.