OFDM Signal Transmission Phase Continuity Method
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Solution Overview
Problem
In conventional OFDM systems, the insertion of a cyclic prefix and weighting masks to combat channel multipath causes side-lobe leakage and interference between sub-carriers, necessitating zero-padding, which reduces the utilization rate of frequency domain resources.
Innovation Solution
Implementing a signal transmission method where all modulation symbols in a time domain resource block on the same frequency domain unit are the same, with adjusted initial phase values to ensure continuous signal phases, reducing side-lobe leakage and avoiding waveform distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cyclic prefix and weighting mask are inserted to combat channel multipath, then signal reliability is improved, but side-lobe leakage occurs and frequency domain resource utilization deteriorates
Solution Approach 1:
The patent changes the parameter of modulation symbols by ensuring all modulation symbols in a time domain resource block on the same frequency domain unit are identical. This parameter change enables phase continuity without requiring cyclic prefix or weighting mask, thus maintaining signal reliability while improving frequency domain resource utilization
Solution Approach 2:
The patent applies preliminary phase adjustment to modulation symbols before transmission. By pre-adjusting the initial phase values of modulation symbols to satisfy a specific relationship, the system ensures phase continuity between adjacent time domain units, eliminating the need for cyclic prefix and weighting mask that would otherwise be required for reliability
2Object-affected harmful factors
If weighting mask and overlap extension are applied to achieve continuous signal phase, then side-lobe leakage is reduced, but inter-carrier interference occurs
Solution Approach 1:
The patent extracts and removes the weighting mask and overlap extension components from the signal processing chain. By using identical modulation symbols with adjusted initial phases instead, the system achieves phase continuity without introducing inter-carrier interference that would result from weighting mask application
3Object-generated harmful factors
If zero-padding is performed on both sides of OFDM carrier to maintain orthogonality, then inter-carrier interference is avoided, but frequency domain resource utilization rate decreases
Solution Approach 1:
The patent changes the parameter of modulation symbols to be identical across time domain units on the same frequency domain unit, which inherently maintains orthogonality and avoids inter-carrier interference without requiring zero-padding. This parameter change eliminates the need for frequency domain resource waste while preserving signal integrity
Data Source
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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, to implement continuous sensing signal phases of adjacent time domain units in the time domain resource block of the first sensing resource block on the same frequency domain unit.