SRS Cyclic Shift Configuration for PAPR Optimization
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently configuring reference signals (RS) for multiple input multiple output (MIMO) technologies, particularly with the increasing demand for higher data throughput and the need for enhanced peak to average power ratio (PAPR) performance.
Innovation Solution
The proposed solution involves determining and configuring cyclic shifts (CS) for SRS transmissions with four antenna ports, using a comb-structure resource with a comb value of eight, and mapping eight antenna ports to a comb-structure resource to optimize PAPR performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of antenna ports is increased to support higher data throughput, then the data throughput and capacity are improved, but the PAPR performance deteriorates
Solution Approach 1:
The patent segments the eight antenna ports into multiple groups (e.g., four groups of two ports each, or two groups of four ports each) and applies different cyclic shift values to each group. This segmentation allows the system to support more antenna ports for higher throughput while controlling PAPR by ensuring that ports within each group use orthogonal cover codes for orthogonality, and groups use different cyclic shifts to avoid interference.
Solution Approach 2:
The patent applies different cyclic shift values to different groups of antenna ports based on their specific requirements. Each group is assigned a unique cyclic shift value (e.g., first group gets CS=0, second group gets CS=3) to optimize local PAPR performance while maintaining overall system throughput. This local differentiation resolves the contradiction between supporting more ports and maintaining PAPR performance.
2Reliability
If multiple cyclic shifts are used for different sets of antenna ports, then the PAPR performance is improved, but the device complexity increases
Solution Approach 1:
The patent changes the cyclic shift parameter values assigned to different antenna port groups to optimize PAPR performance. By using specific cyclic shift values (such as 0 and 3) that are orthogonal to each other, the system improves PAPR while keeping the configuration manageable through standardized parameter selection rather than arbitrary complex assignments.
Data Source
AI summary
Example embodiments of the present disclosure relate to an effective mechanism for reference signal (RS) configuration. In this solution, the terminal device determines at least one cyclic shift (CS) for an SRS transmission with four antenna ports, the at least one CS comprising: at least one first CS and at least one second CS, where the at least one second CS is different from the at least one first CS. Further, the terminal device transmits, to a network device and based on the at least one first CS and the at least one second CS, the SRS transmission over a comb-structure resource with a comb value of eight. In this way, the peak to average power ratio (PAPR) performance is improved.