OFDM Sensing Signal Phase Continuity for Side-Lobe and ICI Control
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Solution Overview
Problem
In conventional OFDM systems, the insertion of a cyclic prefix (CP) causes phase discontinuity between adjacent OFDM symbols, leading to side-lobe leakage and inter-carrier interference, which affects spectrum efficiency and resource utilization.
Innovation Solution
By ensuring all modulation symbols within a time domain resource block on the same frequency domain unit are the same and adjusting initial phase values to maintain continuous phases between adjacent time domain units, the method reduces side-lobe leakage and inter-carrier interference while preserving frequency domain resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cyclic prefix is inserted at the tip of each OFDM symbol to combat channel multipath, then channel multipath resistance is improved, but phase continuity between adjacent OFDM symbols deteriorates, causing side-lobe leakage
Solution Approach 1:
The patent segments the OFDM signal into multiple continuous time domain units within a time domain resource block. By ensuring that modulation symbols on the same frequency domain unit across these segmented time units maintain phase continuity, the patent resolves the phase discontinuity issue while preserving the cyclic prefix structure for multipath resistance.
Solution Approach 2:
The patent changes the phase parameter of modulation symbols across adjacent time domain units. Specifically, it ensures that initial phase values satisfy a specific relationship (first relationship) to maintain continuous sensing signal phases, thereby eliminating side-lobe leakage while keeping the cyclic prefix intact for multipath combat.
2Reliability
If a cyclic prefix is inserted at the tip of each OFDM symbol to combat channel multipath, then channel multipath resistance is improved, but inter-carrier interference increases due to phase discontinuity
Solution Approach 1:
The patent segments the OFDM signal into multiple continuous time domain units and applies phase continuity constraints across these segments. This segmentation approach allows maintaining the cyclic prefix structure for multipath resistance while eliminating inter-carrier interference through proper phase management at segment boundaries.
Solution Approach 2:
The patent modifies the phase parameter of modulation symbols to satisfy a specific relationship across adjacent time domain units. This parameter change ensures phase continuity, which eliminates inter-carrier interference while preserving the cyclic prefix's ability to combat channel multipath.
3Object-generated harmful factors
If phase continuity is maintained between adjacent time domain units, then side-lobe leakage is reduced, but device complexity increases due to phase coordination requirements
Solution Approach 1:
The patent establishes a specific relationship (first relationship) for initial phase values across time domain units. This parameter specification provides a clear, systematic method for maintaining phase continuity, reducing side-lobe leakage while managing device complexity through standardized phase coordination rules.
4Object-generated harmful factors
If phase continuity is maintained between adjacent time domain units, then inter-carrier interference is avoided, but device complexity increases due to phase coordination requirements
Solution Approach 1:
The patent establishes a specific relationship (first relationship) for initial phase values across time domain units. This parameter specification provides a clear, systematic method for maintaining phase continuity, eliminating inter-carrier interference while managing device complexity through standardized phase coordination rules.
Data Source
AI summary
This application discloses a signal transmission method and apparatus, a signal sending device, and a signal receiving device, and belongs to the field of communication technologies. The signal transmission method according to embodiments of this application includes: A signal sending device sends a first signal based on a first resource block. The first signal includes a sensing signal. The first resource block includes a first sensing resource block. A time domain resource block of the first sensing resource block includes at least two continuous time domain units. All modulation symbols of the time domain resource block of the first sensing resource block on a same frequency domain unit are the same, and initial phase values of different time domain units in the time domain resource block of the first sensing resource block on the same frequency domain unit satisfy a first relationship.